[time-nuts] Variation in Radioactive Decay Rate with Solar Activity

[J. Forster]

Well...

1 Ci = 3.7×10E+10 decays per second, so 10 uCi = 3.7x10E+5

So, if the counting interval was 1 second, one can expect 370,000 +/- 6000
counts.

The count rate seems reasonable for easily available equipment. Longer
count times are, of course, needed to get the  6000/370,000 number down.
If the count time went to 100 seconds, 60,000/37,000,000 (SQRT N / N ).
Poisson Statistics.

-John

=================



> 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)...
>
>
>
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