Re: [Powernet] [EXTERNAL] Industry pulse on alpha instrument used to counts smears for alpha in the field

2019-02-08 Thread Rolph, James Thomas Jr via Powernet 
Our procedural guidance requires better than 20 dpm within TVA.

We currently use the Ludlum Model 12 with scaler option and a 43-92 detector. 
We are finding that as these instruments age we are not able to achieve the 
background and efficiency limits that permit us to use 2 minute counting. So we 
are looking at other options and thought we would see what others are using.

We appreciate all the responses we have gotten.


From: Powernet [mailto:powernet-boun...@hpspowernet.org] On Behalf Of Ziegler, 
Susanne E. via Powernet
Sent: Friday, February 08, 2019 6:31 AM
To: powernet@hpspowernet.org
Cc: Ziegler, Susanne E.
Subject: Re: [Powernet] [EXTERNAL] Industry pulse on alpha instrument used to 
counts smears for alpha in the field


TVA External Message. Please use caution when opening.
What are the MDAs for everyone’s field alpha meters?  Sue
Sue Ziegler
PSEG Nuclear LLC
Nuclear Technical Supervisor
856-339-5143
856-378-9425

Gadugi-working together for the good of all



[https://www.pseg.com/images/global/email/PSEG_emailsignature_PSEGw-tag_version2.png]

[http://facebook.com/pseg]

[Twitter]

[LinkedIn]

[https://www.pseg.com/images/global/WP_LOGOgrey.png]



PSEGSC
From: Powernet [mailto:powernet-boun...@hpspowernet.org] On Behalf Of Rolph, 
James Thomas Jr via Powernet
Sent: Tuesday, February 05, 2019 1:11 PM
To: 'powernet@hpspowernet.org'
Cc: Rolph, James Thomas Jr
Subject: [EXTERNAL] [Powernet] Industry pulse on alpha instrument used to 
counts smears for alpha in the field

Email sent from outside of PSEG. Use caution before using links/attachments.
We would like to conduct a short pulse within the industry of what portable 
instrument (meter and detector model) your site uses to count smears for alpha 
in the field.

Thank you in advance,

James (JT) Rolph, CHP
Superintendent, RP Technical Support
Radiation Protection

Tennessee Valley Authority; Sequoyah Nuclear Plant
2600 Igou Ferry Road
Soddy Daisy, TN 37379

423-843-8115 (w)
423-521-9169 (m)
jtro...@tva.gov
[https://lakeinfo.tva.gov/web/images/tva_logo_32b.png]
[https://lakeinfo.tva.gov/web/images/blue_line.png]
[https://lakeinfo.tva.gov/web/images/facebook2.png][https://lakeinfo.tva.gov/web/images/twitter2.png][https://lakeinfo.tva.gov/web/images/instagram2.png][https://lakeinfo.tva.gov/web/images/youtube2.png][https://lakeinfo.tva.gov/web/images/linkedin2.png][https://lakeinfo.tva.gov/web/images/flickr2.png]
NOTICE: This electronic message transmission contains information that may be 
TVA SENSITIVE, TVA RESTRICTED, or TVA CONFIDENTIAL. Any misuse or unauthorized 
disclosure can result in both civil and criminal penalties. If you are not the 
intended recipient, be aware that any disclosure, copying, distribution, or use 
of the content of this information is prohibited. If you have received this 
communication in error, please notify me immediately by email and delete the 
original message.


The information contained in this e-mail, including any attachment(s), is 
intended solely for use by the named addressee(s). If you are not the intended 
recipient, or a person designated as responsible for

Re: [Powernet] [EXTERNAL] Industry pulse on alpha instrument used to counts smears for alpha in the field

2019-02-08 Thread Ziegler, Susanne E. via Powernet 
What are the MDAs for everyone’s field alpha meters?  Sue
Sue Ziegler
PSEG Nuclear LLC
Nuclear Technical Supervisor
856-339-5143
856-378-9425

Gadugi-working together for the good of all




[https://www.pseg.com/images/global/email/PSEG_emailsignature_PSEGw-tag_version2.png]
[http://facebook.com/pseg][Twitter] 
 [LinkedIn] 
   
[https://www.pseg.com/images/global/WP_LOGOgrey.png] 


PSEGSC
From: Powernet [mailto:powernet-boun...@hpspowernet.org] On Behalf Of Rolph, 
James Thomas Jr via Powernet
Sent: Tuesday, February 05, 2019 1:11 PM
To: 'powernet@hpspowernet.org'
Cc: Rolph, James Thomas Jr
Subject: [EXTERNAL] [Powernet] Industry pulse on alpha instrument used to 
counts smears for alpha in the field

Email sent from outside of PSEG. Use caution before using links/attachments.
We would like to conduct a short pulse within the industry of what portable 
instrument (meter and detector model) your site uses to count smears for alpha 
in the field.

Thank you in advance,

James (JT) Rolph, CHP
Superintendent, RP Technical Support
Radiation Protection

Tennessee Valley Authority; Sequoyah Nuclear Plant
2600 Igou Ferry Road
Soddy Daisy, TN 37379

423-843-8115 (w)
423-521-9169 (m)
jtro...@tva.gov
[https://lakeinfo.tva.gov/web/images/tva_logo_32b.png]
[https://lakeinfo.tva.gov/web/images/blue_line.png]
[https://lakeinfo.tva.gov/web/images/facebook2.png][https://lakeinfo.tva.gov/web/images/twitter2.png][https://lakeinfo.tva.gov/web/images/instagram2.png][https://lakeinfo.tva.gov/web/images/youtube2.png][https://lakeinfo.tva.gov/web/images/linkedin2.png][https://lakeinfo.tva.gov/web/images/flickr2.png]
NOTICE: This electronic message transmission contains information that may be 
TVA SENSITIVE, TVA RESTRICTED, or TVA CONFIDENTIAL. Any misuse or unauthorized 
disclosure can result in both civil and criminal penalties. If you are not the 
intended recipient, be aware that any disclosure, copying, distribution, or use 
of the content of this information is prohibited. If you have received this 
communication in error, please notify me immediately by email and delete the 
original message.



The information contained in this e-mail, including any attachment(s), is 
intended solely for use by the named addressee(s). If you are not the intended 
recipient, or a person designated as responsible for delivering such messages 
to the intended recipient, you are not authorized to disclose, copy, distribute 
or retain this message, in whole or in part, without written authorization from 
PSEG. This e-mail may contain proprietary, confidential or privileged 
information. If you have received this message in error, please notify the 
sender immediately. This notice is included in all e-mail messages leaving 
PSEG. Thank you for your cooperation.
___
Powernet mailing list
Powernet@hpspowernet.org
http://hpspowernet.org/mailman/listinfo/powernet_hpspowernet.org

Re: [Powernet] [EXTERNAL] Industry pulse on alpha instrument used to counts smears for alpha in the field

2019-02-05 Thread Vickers, Glen:(GenCo-Nuc) via Powernet 
We use the Ludlum 3030P which has the PIPS semiconductor detector.  Still need 
a count rate limit to do smear-of-a-smear to prevent false beta and alpha at 
high count rates.  If the photon count rate is too high, the mV pulses in one 
count period will get added together and create  a combined mV that may be high 
enough to exceed the threshold for a beta count.  If the beta activity is too 
high you can create false alpha counts.  We use 500 kdpm as our limit.  You'll 
also want to disable the beta-to-alpha crosstalk to not subtract any alpha 
counts.  Someone suggested lowering the upper mV window for alpha to try to 
filter out Rn at ~6 MeV, but that's where we have Cm-242, so don't doodle with 
the alpha windows or you'll also filter out real alpha.

I like the detector because of it's response.  As an example you might think 
the beta pulse height is linear based upon energy; however beta being a medium 
LET radiation type will only deposit so much energy in the thin active volume 
and the remainder escapes.  So, even if you go from Tc-99 to Sr-90 beta energy, 
you can't get a pulse height high enough to get into the alpha channel.

We've seen handheld probes have false alpha counts at relatively low beta-gamma 
radiation levels compared to some benchtop counters, so you'd want to validate 
those limitations before you bought a bunch of any specific portable probe 
model.  Every instrument will have limitations.  I would go to all 3030P units 
and save my portable alpha frisker for that case where I have a level 3 alpha 
are with a b/a ratio <50 and have to frisk personnel.  I'd also be comfortable 
with SAC-4 units til they pass on.

Every instrument has limitations, so verify them yourself.  SAC-4 still a good 
instrument if you have any around, but we're happy with the 3030P transition.

Glen Vickers, CHP
Exelon RP Technical Lead

From: Powernet  On Behalf Of Rolph, James 
Thomas Jr via Powernet
Sent: Tuesday, February 05, 2019 12:11 PM
To: 'powernet@hpspowernet.org' 
Cc: Rolph, James Thomas Jr 
Subject: [EXTERNAL] [Powernet] Industry pulse on alpha instrument used to 
counts smears for alpha in the field

We would like to conduct a short pulse within the industry of what portable 
instrument (meter and detector model) your site uses to count smears for alpha 
in the field.

Thank you in advance,

James (JT) Rolph, CHP
Superintendent, RP Technical Support
Radiation Protection

Tennessee Valley Authority; Sequoyah Nuclear Plant
2600 Igou Ferry Road
Soddy Daisy, TN 37379

423-843-8115 (w)
423-521-9169 (m)
jtro...@tva.gov
[https://lakeinfo.tva.gov/web/images/tva_logo_32b.png]
[https://lakeinfo.tva.gov/web/images/blue_line.png]
[https://lakeinfo.tva.gov/web/images/facebook2.png][https://lakeinfo.tva.gov/web/images/twitter2.png][https://lakeinfo.tva.gov/web/images/instagram2.png][https://lakeinfo.tva.gov/web/images/youtube2.png][https://lakeinfo.tva.gov/web/images/linkedin2.png][https://lakeinfo.tva.gov/web/images/flickr2.png]
NOTICE: This electronic message transmission contains information that may be 
TVA SENSITIVE, TVA RESTRICTED, or TVA CONFIDENTIAL. Any misuse or unauthorized 
disclosure can result in both civil and criminal penalties. If you are not the 
intended recipient, be aware that any disclosure, copying, distribution, or use 
of the content of this information is prohibited. If you have received this 
communication in error, please notify me immediately by email and delete the 
original message.


This Email message and any attachment may contain information that is 
proprietary, legally privileged, confidential and/or subject to copyright 
belonging to Exelon Corporation or its affiliates ("Exelon"). This Email is 
intended solely for the use of the person(s) to which it is addressed. If you 
are not an intended recipient, or the employee or agent responsible for 
delivery of this Email to the intended recipient(s), you are hereby notified 
that any dissemination, distribution or copying of this Email is strictly 
prohibited. If you have received this message in error, please immediately 
notify the sender and permanently delete this Email and any copies. Exelon 
policies expressly prohibit employees from making defamatory or offensive 
statements and infringing any copyright or any other legal right by Email 
communication. Exelon will not accept any liability in respect of such 
communications. -EXCIP
___
Powernet mailing list
Powernet@hpspowernet.org
http://hpspowernet.org/mailman/listinfo/powernet_hpspowernet.org