Hi Since the same setup is also a fairly good random number generator, you *will* find correlations. Proving that they are significant is the hard part.
Bob On Aug 3, 2011, at 5:39 PM, J. Forster wrote: > You measure the number of counts in a constant time interval. That gives > you a rate, which is predictable from the known half-life of the source. > > What you are looking for ius deviations from the rate that correlate wqith > the sun's rotation (or something else). > > The best way might be to measure the rate, and then auto-correlate it or > cross-correlate it with, say, the known sun rotation. > > -John > > =================== > >> Hi Jim: >> >> The problem I'm having is that just counting the clicks from a source is >> a way to get random numbers. If you average the clicks over a large >> amount of time and plot that average, it will decrease over time. So to >> see the change in decay rate the source needs to have a short half-life. >> >> The article mentions (ordered by half life): >> manganese-54 (312.03 days or 26.9E6 sec) >> cesium-137 (30.17 years) >> silicon-32 (170 years or 5.4E9 sec) >> radium-226 (1601 years) >> >> manganese-54 looks like the shortest half life that was mentioned and >> it's avaialble from United Nucular: >> http://unitednuclear.com/index.php?main_page=product_info&cPath=2_5&products_id=819 >> Here's their table of Disk Sources which has some isotopes that have a >> shorter half life: >> *Cobalt^57 *270 days >> *Zinc^65 *244 days >> *Polonium^210 * 138 days (also available as a needle source) >> >> So in the disk sources Polonium-210 has the shortest half life. >> http://en.wikipedia.org/wiki/Polonium >> >> ISOTOPE ACTIVITY HALF-LIFE ENERGIES (KeV) >> *Barium^133 * 1uCi 10.7 years *Gamma: *81.0, 356.0 >> *Cadmium^109 * 1uCi 453 days *Gamma: *88.0 >> *Cesium^137 * *1*uCi 30.1 years *Gamma: *32, 661.6 >> *Beta: *511.6, 1173.2 >> *Cesium^137 * *5*uCi 30.1 years *Gamma: *32, 661.6 >> *Beta: * 511.6, 1173.2 >> *Cesium^137 * *10*uCi 30.1 years *Gamma: *32, 661.6 >> *Beta:* 511.6, 1173.2 >> *Cobalt^57 * 1uCi 270 days *Gamma: *122.1 >> *Cobalt^60 * 1uCi 5.27 years *Gamma: *1173.2, 1332.5 >> *Europium^152 * 1uCi 13.5 years *Gamma: *121.8, 344.3, 1408.0 >> *Manganese^54 * 1uCi 312 days *Gamma: *834.8 >> *Sodium^22 * 1uCi 2.6 years *Gamma: *511.0, 1274.5 >> *Strontium^90 * 0.1uCi 28.5 years *Beta: *546.0 >> *Thallium^204 * 1uCi 3.78 years *Beta: *763.4 >> * Polonium^210 * 0.1uCi 138 days *Alpha: *5304.5 >> *Zinc^65 * 1uCi 244 days *Gamma: *511.0, 1115.5 >> >> >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> http://www.End2PartyGovernment.com/ >> >> >> Jim Lux wrote: >>> On 8/3/11 12:14 PM, J. Forster wrote: >>>> Hi Brooke, >>>> >>>> Maybe. The photon counting gear is pretty trivial. You'd need: >>>> >>>> A scintillator >>>> A PMT (Photo Multiplier Tube) and HV stable HV PS. >>>> A preamp >>>> A SCA (Single Channel Analyzer). These can be built. >>>> A counter, stable time base, and data recorder >>>> >>>> The main difficulty, IMO, would be getting a sufficient sized lump of >>>> the >>>> material. Chunks of Cs don't grow on trees, at least not where I live. >>>> >>> >>> Does it have to be Cs? United Nuclear sells a wide variety of >>> calibration sources for <$100. Yes, they have Cs137 (10 microCuries)... >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
