[neonixie-l] Re: Radioactive Nixies - Study

[SWISSNIXIE - Jonathan F.]

Dont worry about alpha particles, the SBM-20 is made from metal, so alpha 
particles can't reach the inside of the tube. Alpha particles are usally 
blocked by a piece of paper or a sufficient space of air. The SBM-20 tube 
you have is not alpha sensitive, so don't worry about them. 

For an accurate measurement, i would record the background counts for like 
1hr, and then place the tubes there for one hr, this will get you a better 
average CPM than short-time samples. 

The middle metal part of the tube is GND, so it would be enough to cover 
the terminals, or cut out a long-hole in the case. Or take a plastic pipe 
and drill a lot of holes in it. 

For shielding i would use lead, have a look at "gamma spectroscopy lead 
shielding" - it will work for gm tubes as well. Since quality lead will not 
be available for free, it might be a better idea to get a more sensitive 
tube. LND Inc will sell pancake tubes LND 7314 (alpha,beta,gamma) and 
similar tubes that opperate at 500V, they will work at 450 too. The price 
for a LND7314 is around 115$,and is very similar to the one that is inside 
the rate meter i have in the picture. 

And here you can find a comparison between common geiger tubes: Link! 



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[neonixie-l] Re: Radioactive Nixies - Study

[Paul Andrews]

I did try putting the SB-20 on top of a bunch of tubes (a bunch = 3 in this 
case). It briefly got up to around 120CPM, but mostly hovered around 50-70CPM. 
I'm not sure what background is at my place. Anything between 15 and 35 CPM 
maybe. So maybe it registered something, or it could be statistically 
background. I would have to make a ton more measurements (a ton >> 3) to figure 
out how this meter behaves and then another ton to see if it was actually 
measuring anything more with the tubes.

I am mulling over building a case for this meter, but I can't decide how to do 
it whilst a) not blocking alpha particles and b) not exposing the 450v or so 
(although we are talking micro amps here). I guess an opening that doesn't 
expose the terminals would do.

That has given me an idea. I could shield the SBM-20 from all but one direction 
and then try with the 5092A's again, maybe there will be a more significant 
difference. What kind of shielding might be necessary?

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[neonixie-l] Re: Radioactive Nixies - Study

[Paul Andrews]

Just got my radioactive nixie tubes. Sadly they seem to make my geiger 
counter  read less 
than normal!




On Sunday, March 12, 2017 at 3:41:11 PM UTC-4, SWISSNIXIE - Jonathan F. 
wrote:
>
> Hi
>
> This might be a little off topic or irrelevant, but maybe someone is 
> interested in it too. 
>
> One of my hobbies aside nixies is technology related with radiation and 
> nuclear (geiger counters, etc). 
> Today i was sorting my nixies into boxes and held a B-5092-A from 
> Burroughs, as i spotted a print that looked like a part of a radiation 
> warning sign, i inspected all of my B-5092-A - and bingo, one had the 
> complete sing. So this tubes are or have been radioactive. 
>
> Before anyone gets nervous about having possible radioactive nixies i will 
> write a detailed report about this. 
>
>
> For these who not know, everything is radioactive, even the air we breathe 
> all day - this is because of the naturally occuring radiation comming from 
> minerals and of cosmic rays entering or earth. A Geiger Counter measures 
> radiation events in time, usually "counts per minute" or "counts per 
> second". The background-rate depends on your location (e.g. in the montains 
> you have a higher rate than in cities). The CPM (counts perminute) depend 
> on the type of detector - but the calculated dose should always be the same 
> (some detecors for example give you 100cpm others only 1cpm but with their 
> conversion factors both end up giving the same dose).
>
> The normal background dose on earth is usually *0.1* to* 0.5* 
> microSievert/hour (uS/h)
>
> My background at home is *0.15 uS/h  *which is* 40 CPM* with my type of 
> detector. 
>
> The B-5092-A reads only about 
>
> *100 CPM (0.4 uS/h)*Is it dangerous for your health? - Far from it! You 
> could carry this tube your whole life around your neck and it would not 
> endanger your health. 
>
> For example, an intercontinental airline flight will give your up to *3.00 
> uS/h* and not even this is dangerous - it only would affect you if you 
> would fly constantely for years.
>
> So this tubes are perfectly save to carry and handle! There maybe 
> potential way more dangerous items in your house - like watches with 
> glowing digits. 
>
>
> *** OFF TOPIC ***
>
> But why is the tube radioactive, and whats in it?
>
> To answer this you need to look in deeper in radiation.
> There are 5 types of radioactive "rays"
>
> Alpha :Can only travel a few centimeter, and are not 
> possible to penetrate paper. So if you put a paper over a alpha source, you 
> will not - or very low - notice it
> Beta  : Can penetrate thin objects, can not penetrate 
> metals like aluminium
> Gamma:  Can penetrate solid objects, penetrate medium thick 
> metals. Usually stopped by lead shielding
> Neutron:  Very high energy radiation, can nearly penetrate 
> everything, concrete, lead etc
> X-Rays:   Special form of radiation, tend to "bounce off" 
> shields instead of getting in ther. 
>
>
> I tested the tube with different Geiger-Tubes. The tube does not contain a 
> isotope (radioactive element) that is 100% alpha radiation, since alpha can 
> not penetrate the glass.
> Also, the isotope cant be 100% gamma, since a gamma geiger tube does not 
> pick up a significant change. 
> So the isotope we are looking for is potentialli a beta-isotope and is a 
> gas. The isotpe must have a relative long half-life too.
>
> Whats half-life?
> An unit to measure how long it takes for a radioactive element to be just 
> half of its activity. Eg. if your have 100 today, and the half-live is 10 
> years, there will be only 50 left in 10 years!
>
> I did a little reseach and the gas we are looking for is Krypton Kr-85
> It was used in different types of tubes, usually to help ignite something 
> (like a nixie digit). 
>
> Facts on Kr-85:
>
> It has a half life of nearly 11 Years, this means if the tube is 30 years 
> old, today only 12.5% of its radioactive gas is still active. 
> The only way Kr-85 *could* affect your health is when you drop the tube 
> and inhale the gas. 
>
> But by the fact, that there is such a small amount and only a few activity 
> of it left, the gas would merge directly with the room air and would not be 
> dangerous. 
>
> Last but not least ;) - the tube is NOT SAVE FOR EATING :-) for various 
> other reasons!
>
>
>
>
>
>

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[neonixie-l] Re: Radioactive Nixies - Study

['Dave' via neonixie-l]

*Norskman*,
 I have privately replied.
Please do the same or email me so we don't fill up this thread with posts.
thanks


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Re: [neonixie-l] Re: Radioactive Nixies - Study

[NeonJohn]

On 03/16/2017 12:42 AM, 'threeneurons' via neonixie-l wrote:

> A few years back, Westdave had just visited his cardiologist, the day 
> before the TRW swapmeet. He had an exam, that required ingesting some 
> radioactive "juice". At the swapmeet, a vendor was selling a working geiger 
> counter. Dave lit up that puppy.

A couple of years ago I had a nuclear stress test run.  They injected
the Tc-99 and then told me to go eat a good greasy lunch to help
distribute it.  I had brought my Victoreen RO-3 ion chamber exposure
meter with me.  I have a selfie of me holding the meter to my chest
where I was emanating 30 mR/hr.  Hot stuff, I was.

John


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Tellico Plains, Occupied TN
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RE: [neonixie-l] Re: Radioactive Nixies - Study

[Tidak Ada]

Kryptons are also used in big Xerox machines, that spew tens or hundreds of 
photocopies per minute.

eric

-Oorspronkelijk bericht-
Van: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] Namens 
JohnK
Verzonden: donderdag 16 maart 2017 10:19
Aan: neonixie-l@googlegroups.com
Onderwerp: Re: [neonixie-l] Re: Radioactive Nixies - Study

"We" used a couple of tiny very sensitive [and fast apparently] scr and triac 
devices in an IR movement detector light for home use. Around the time models 
were made for the UK market a fax was received from some US agency via 
channels. It was a list of countries that it mustn't be exported to.

No attempts were made by anyone to stop re-directors or private export. Yes, 
the components were bomb-industry things.
I wonder if it was implied that they would hold the manufacturer responsible?

John K
Australia




- Original Message -
From: "SWISSNIXIE - Jonathan F." <jfrech...@gmail.com>
To: "neonixie-l" <neonixie-l@googlegroups.com>
Sent: Thursday, March 16, 2017 4:15 PM
Subject: [neonixie-l] Re: Radioactive Nixies - Study


> These Krytrons are nice!
>
> I want one so bad, but sadly they seem to be export controlled from united 
> states because they were part of nukes :-(
>
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> 

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[neonixie-l] Re: Radioactive Nixies - Study

[SWISSNIXIE - Jonathan F.]

These Krytrons are nice!

I want one so bad, but sadly they seem to be export controlled from united 
states because they were part of nukes :-(

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[neonixie-l] Re: Radioactive Nixies - Study

['threeneurons' via neonixie-l]

A krytron. A gas filled cold cathode trigger tube, containing radioactive 
material used to detonate a nuke.


A few years back, Westdave had just visited his cardiologist, the day 
before the TRW swapmeet. He had an exam, that required ingesting some 
radioactive "juice". At the swapmeet, a vendor was selling a working geiger 
counter. Dave lit up that puppy.



>

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[neonixie-l] Re: Radioactive Nixies - Study

[SWISSNIXIE - Jonathan F.]

There is no danger about them tubes! Even a few cm away you cant detect the 
radiation anymore.

8 of the 5092a could not produce a visible gamma spectrometry peak on my 
professional detector.

For comparison, a 6141 Voltage Regulator Tube does produce a relative big peak.


About tubes from RUS/UKR, the chance you get tubes from chernobyl is very 
small. It seems the soviet produced large amounts of all kind of stuff, just 
browse ebay... capacitors,tubes,resistors,geiger tubes All can be found in 
large amounts.  Chernobyl is still a military controlled zone, you would not 
get out there with truckloads of stuff. I guess there are abandodoned factories 
and storages all over russia where people take materials away. Back to 
radiation: The soviets even have abandoned nuclear heat generators (RTGs) in 
lighthouses and military bases, and those things have very dangerous sources in 
them.

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[neonixie-l] Re: Radioactive Nixies - Study

[GastonP]

Well, the first thing I did when I built my Geiger counter was to go 
through all of my ex-USSR sourced stuff. Just in case, you know :).
Nothing hot in there so far.

On Tuesday, March 14, 2017 at 3:22:03 AM UTC-3, Terry Kennedy wrote:
>
> On Sunday, March 12, 2017 at 11:17:31 PM UTC-4, Paul Andrews wrote:
>>
>> I have often wondered about taking a geiger counter to my tubes. Call me 
>> paranoid, but I wonder where some of the NOS tubes come from precisely.
>>
>
> Some years ago I bought an Elektronika 7-06K from an eBay seller in 
> Ukraine. It was full of the most noxious dust I could imagine - like finely 
> pulverized concrete, but very acrid. I asked the seller where he got the 
> clock, and he said "A disused industrial premise approximately 100km NNW of 
> Kiev". I don't know if he was kidding or not, but Chernobyl definitely had 
> some 7-06K's: 
> http://newsinphoto.ru/wp-content/uploads/2011/04/chernocY-960x667.jpg
>

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Re: [neonixie-l] Re: Radioactive Nixies - Study

[NeonJohn]

On 03/14/2017 05:05 AM, Luca Bertagnolio wrote:

>  Welcome to the fascinating world of radiation, known by little and
> feared by most, for no good reason. More people have been killed by
> fear of radiation than by radiation itself.

This is literally true.  Several people were killed fleeing Three Mile
Island when the accident was wholly contained on-side and no off-site
radiation was measured.

John


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[neonixie-l] Re: Radioactive Nixies - Study

[Paul Andrews]

Which is where my thoughts about the provenance of tubes from the Ukraine 
arises. Where are these warehouses that for some reason still have large 
quantities of Nixie tubes in them?

This doesn't keep me up at night, but I would like to know. Perhaps someone 
could make a documentary about the supply chain for old Nixie tubes from the 
former USSR? I'm not sure there would be a huge market for it though!


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Re: [neonixie-l] Re: Radioactive Nixies - Study

[Luca Bertagnolio]

On 14 March 2017 at 09:25:17, newxito (axta...@gmail.com) wrote:
I begin to get really nervous, I think I'll buy a geiger counter
a geiger counter will do nothing to reduce your nervousness, in fact it might 
even make it worse, for no real good reason.

What can help you dominate your unwarranted nervousness about radiation is 
studying the topic, and understanding how much it has been inflated by the 
media and politicians, which love it as a topic, because it helps them a great 
deal in selling their “product”, be it newspapers, magazines, clicks on a 
website, or votes.

If you are curious, then you can find these two resources, freely available 
online, interesting:

http://nuclear4life.com/

http://www.mn.uio.no/fysikk/tjenester/kunnskap/straling/radiation-and-health-2015.pdf

Welcome to the fascinating world of radiation, known by little and feared by 
most, for no good reason. More people have been killed by fear of radiation 
than by radiation itself.

Bye, Luca



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Re: [neonixie-l] Re: Radioactive Nixies - Study

[Paolo Cravero]

On Tue, Mar 14, 2017 at 9:25 AM, newxito wrote:

I begin to get really nervous, I think I'll buy a geiger counter
>

Measuring radioactivity is a science itself and to get meaningful data you
need to have a good understanding of the phenomena (physics).

For example, measuring emissions close to the object will never represent
real-life situations where Nixies (in this case) sit on a shelf in the
living room. Also, an object that has been in a radioactive environment
doesn't turn active itself (in general). I am sure NeonJohn could tell a
lot about this subject.

If you are into building circuits, search for "BPW34 counter" and pick one:
this will give you an initial idea of what is active around you. The
photodiode must be shielded from light (but not too much otherwise you
block beta/weak radiation).

For a very quick way, get the Radioactivity Counter by Mr Klein (both
Android and Apple) that uses the photocamera of a smartphone operated in
darkness (use kitchen Alu foil kept in place by the back cover: removable,
mechanical, no sticky tape needed thus reusable on the field). His
documentation also does a good job explaining how to operate properly the
App, which creates a background for the BPW34 too. You won't get absolute
uS/h values, but you'll begin to "see" what is around you. Note that it
took me months before I came across something active. Also note that the
photocamera is sensitive to a definite range of energy in ionizing
particles (smtg like 200 to 600 kEv), so you won't get weaks and strongs,
but it is a starting point IMO.

That said, counters with Geiger-Muller tubes seem to hold their market
value, but you need to understand what the meter is telling you, and how
you measure.

As Jonathan said, with Nixies the higher danger is through ingestion, but
for other obvious reasons!

Paolo

PS: thanks for both 5092A pictures. Looks like mine are normal 5092.

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[neonixie-l] Re: Radioactive Nixies - Study

[newxito]

I begin to get really nervous, I think I'll buy a geiger counter

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[neonixie-l] Re: Radioactive Nixies - Study

[Terry Kennedy]

On Sunday, March 12, 2017 at 11:17:31 PM UTC-4, Paul Andrews wrote:
>
> I have often wondered about taking a geiger counter to my tubes. Call me 
> paranoid, but I wonder where some of the NOS tubes come from precisely.
>

Some years ago I bought an Elektronika 7-06K from an eBay seller in 
Ukraine. It was full of the most noxious dust I could imagine - like finely 
pulverized concrete, but very acrid. I asked the seller where he got the 
clock, and he said "A disused industrial premise approximately 100km NNW of 
Kiev". I don't know if he was kidding or not, but Chernobyl definitely had 
some 7-06K's: 
http://newsinphoto.ru/wp-content/uploads/2011/04/chernocY-960x667.jpg

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[neonixie-l] Re: Radioactive Nixies - Study

[SWISSNIXIE - Jonathan F.]

Another really hot source that can be found at home is maybe in a smoke 
detector!

Some smoke-detecors use Am-241 sources to ionize the air.  But the sources 
are encapsulated and you only can detect them if you disassemble your smoke 
alarm (which i would not do!)

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Re: [neonixie-l] Re: Radioactive Nixies - Study

[NeonJohn]

I didn't include the mantles because most people don't have them.  A lot
of people use the salt substitute.

The Coleman replacement mantles sold by Century and made in India are
still quite hot.

http://www.neon-john.com/Nuke/century_mantle.jpg

Last time I checked, WalMart still carried them.

John


On 03/13/2017 10:37 AM, GastonP wrote:
> Well, I have bought a couple of old gas lamp mantle spares, the ones that 
> shine *very* bright, and use them to check my geiger counters too. They use 
> thorium to give out that extra bright. New ones are made with another 
> process, not so bright but with no radioactive substances either. As far as 
> I know some chinese vendors still sell the thorium covered ones.
> I would tend to think that this would be hotter (radiation wise, of course) 
> than low sodium salt. At least that's what I measured at home.


-- 
John DeArmond
Tellico Plains, Occupied TN
http://www.tnduction.com<-- THE source for induction heaters
http://www.neon-john.com<-- email from here
http://www.johndearmond.com <-- Best damned Blog on the net
PGP key: wwwkeys.pgp.net: BCB68D77

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Re: [neonixie-l] Re: Radioactive Nixies - Study

[GastonP]

Well, I have bought a couple of old gas lamp mantle spares, the ones that 
shine *very* bright, and use them to check my geiger counters too. They use 
thorium to give out that extra bright. New ones are made with another 
process, not so bright but with no radioactive substances either. As far as 
I know some chinese vendors still sell the thorium covered ones.
I would tend to think that this would be hotter (radiation wise, of course) 
than low sodium salt. At least that's what I measured at home.

Gaston

On Sunday, March 12, 2017 at 7:54:26 PM UTC-3, NeonJohn wrote:
>
>
>
> On 03/12/2017 06:16 PM, Charles MacDonald wrote: 
>
> > But how many Bananas and Brazil nuts do you keep around.  those are the 
> > real home based radiation sources... 
> > 
> > 
> http://www.neon-john.com/Nuke/Salt_substitute.jpg 
> http://www.neon-john.com/Nuke/K40_on_geiger_counter.jpg 
> http://www.neon-john.com/Nuke/Nuke_Index.htm 
>
> The K-40 in salt substitute is by far the hottest thing in an ordinary 
> house. 
>
> John 
>
> -- 
> John DeArmond 
> Tellico Plains, Occupied TN 
> http://www.tnduction.com<-- THE source for induction heaters 
> http://www.neon-john.com<-- email from here 
> http://www.johndearmond.com <-- Best damned Blog on the net 
> PGP key: wwwkeys.pgp.net: BCB68D77 
>

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[neonixie-l] Re: Radioactive Nixies - Study

[SWISSNIXIE - Jonathan F.]

Here is the image 



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[neonixie-l] Re: Radioactive Nixies - Study

[SWISSNIXIE - Jonathan F.]

@ Paolo Cravero

Attached is an image of my tube. For detection of the Kr85 in this tube you 
need a beta-sensitve counter that is placed close to the tube.  Just 1-2 cm 
away you cant detect it anymore


@gregebert

If you have more tubes, only the area that is radioactive will be greater, 
the actual radiation is still 0.4uS/h  but the area is now 6 tubes. You 
would only get more radiation if you would take 6 tubes in your hand. When 
in a clock most of the tube is shielded by the case. And for beta radiation 
- after penetrating the tube glass its only really weak, a few centimeters 
away you cant detect it anymore. 



@NeonJohn

Nice! Thats a very interesting field of work :) and wow. 10k Ci Kr-85 thats 
really much - beside that, Kr-85 seems to be "quite save" for authorities, 
since here in Switzerland i could legally own up to 200mCi - which is a 
giant amount compared to other isotopes (like Sr-90 1.2uCi). 

Nice to hear that this nixie contained 1uCi of Kr-85, this leaves me with 
around 1nCi left

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[neonixie-l] Re: Radioactive Nixies - Study

[Paul Andrews]

I have often wondered about taking a geiger counter to my tubes. Call me 
paranoid, but I wonder where some of the NOS tubes come from precisely.

On Sunday, March 12, 2017 at 3:41:11 PM UTC-4, SWISSNIXIE - Jonathan F. 
wrote:
>
> Hi
>
> This might be a little off topic or irrelevant, but maybe someone is 
> interested in it too. 
>
> One of my hobbies aside nixies is technology related with radiation and 
> nuclear (geiger counters, etc). 
> Today i was sorting my nixies into boxes and held a B-5092-A from 
> Burroughs, as i spotted a print that looked like a part of a radiation 
> warning sign, i inspected all of my B-5092-A - and bingo, one had the 
> complete sing. So this tubes are or have been radioactive. 
>
> Before anyone gets nervous about having possible radioactive nixies i will 
> write a detailed report about this. 
>
>
> For these who not know, everything is radioactive, even the air we breathe 
> all day - this is because of the naturally occuring radiation comming from 
> minerals and of cosmic rays entering or earth. A Geiger Counter measures 
> radiation events in time, usually "counts per minute" or "counts per 
> second". The background-rate depends on your location (e.g. in the montains 
> you have a higher rate than in cities). The CPM (counts perminute) depend 
> on the type of detector - but the calculated dose should always be the same 
> (some detecors for example give you 100cpm others only 1cpm but with their 
> conversion factors both end up giving the same dose).
>
> The normal background dose on earth is usually *0.1* to* 0.5* 
> microSievert/hour (uS/h)
>
> My background at home is *0.15 uS/h  *which is* 40 CPM* with my type of 
> detector. 
>
> The B-5092-A reads only about 
>
> *100 CPM (0.4 uS/h)*Is it dangerous for your health? - Far from it! You 
> could carry this tube your whole life around your neck and it would not 
> endanger your health. 
>
> For example, an intercontinental airline flight will give your up to *3.00 
> uS/h* and not even this is dangerous - it only would affect you if you 
> would fly constantely for years.
>
> So this tubes are perfectly save to carry and handle! There maybe 
> potential way more dangerous items in your house - like watches with 
> glowing digits. 
>
>
> *** OFF TOPIC ***
>
> But why is the tube radioactive, and whats in it?
>
> To answer this you need to look in deeper in radiation.
> There are 5 types of radioactive "rays"
>
> Alpha :Can only travel a few centimeter, and are not 
> possible to penetrate paper. So if you put a paper over a alpha source, you 
> will not - or very low - notice it
> Beta  : Can penetrate thin objects, can not penetrate 
> metals like aluminium
> Gamma:  Can penetrate solid objects, penetrate medium thick 
> metals. Usually stopped by lead shielding
> Neutron:  Very high energy radiation, can nearly penetrate 
> everything, concrete, lead etc
> X-Rays:   Special form of radiation, tend to "bounce off" 
> shields instead of getting in ther. 
>
>
> I tested the tube with different Geiger-Tubes. The tube does not contain a 
> isotope (radioactive element) that is 100% alpha radiation, since alpha can 
> not penetrate the glass.
> Also, the isotope cant be 100% gamma, since a gamma geiger tube does not 
> pick up a significant change. 
> So the isotope we are looking for is potentialli a beta-isotope and is a 
> gas. The isotpe must have a relative long half-life too.
>
> Whats half-life?
> An unit to measure how long it takes for a radioactive element to be just 
> half of its activity. Eg. if your have 100 today, and the half-live is 10 
> years, there will be only 50 left in 10 years!
>
> I did a little reseach and the gas we are looking for is Krypton Kr-85
> It was used in different types of tubes, usually to help ignite something 
> (like a nixie digit). 
>
> Facts on Kr-85:
>
> It has a half life of nearly 11 Years, this means if the tube is 30 years 
> old, today only 12.5% of its radioactive gas is still active. 
> The only way Kr-85 *could* affect your health is when you drop the tube 
> and inhale the gas. 
>
> But by the fact, that there is such a small amount and only a few activity 
> of it left, the gas would merge directly with the room air and would not be 
> dangerous. 
>
> Last but not least ;) - the tube is NOT SAVE FOR EATING :-) for various 
> other reasons!
>
>
>
>
>
>

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Re: [neonixie-l] Re: Radioactive Nixies - Study

[NeonJohn]

On 03/12/2017 06:16 PM, Charles MacDonald wrote:

> But how many Bananas and Brazil nuts do you keep around.  those are the
> real home based radiation sources...
> 
> 
http://www.neon-john.com/Nuke/Salt_substitute.jpg
http://www.neon-john.com/Nuke/K40_on_geiger_counter.jpg
http://www.neon-john.com/Nuke/Nuke_Index.htm

The K-40 in salt substitute is by far the hottest thing in an ordinary
house.

John

-- 
John DeArmond
Tellico Plains, Occupied TN
http://www.tnduction.com<-- THE source for induction heaters
http://www.neon-john.com<-- email from here
http://www.johndearmond.com <-- Best damned Blog on the net
PGP key: wwwkeys.pgp.net: BCB68D77

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Re: [neonixie-l] Re: Radioactive Nixies - Study

[Charles MacDonald]

On 17-03-12 04:56 PM, gregebert wrote:

1 tube may produce 0.4uSv/Hr, but a clock with many more tubes will
produce more radiation. I have a total of 47 nixie tubes operating in my
home, plus another 6 at work. However, most of my tubes are at least 50
years old, so I'm not too concerned.



But how many Bananas and Brazil nuts do you keep around.  those are the 
real home based radiation sources...



--
Charles MacDonald Stittsville Ontario
cm...@zeusprune.ca  Just Beyond the Fringe
No Microsoft Products were used in sending this e-mail.

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[neonixie-l] Re: Radioactive Nixies - Study

[gregebert]

1 tube may produce 0.4uSv/Hr, but a clock with many more tubes will produce 
more radiation. I have a total of 47 nixie tubes operating in my home, plus 
another 6 at work. However, most of my tubes are at least 50 years old, so 
I'm not too concerned. 

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