I think you'd want to detect as large a fraction of the events as
possible. IMO, putting the source between two disks of plastic
scintillator material in a shallow well and coupled together w/ clear
silicone grease might be a good way to go.
An alternate might be with the source in a hole in a blo
> Hi John:
>
> Very interesting. I wonder if it's something that can be observed in a
> home system?
> I've got some radioactive samples and various counters that detect their
> particles as well a precision time equipment.
> http://en.wikipedia.org/wiki/Radioactive_decay#Changing_decay_rates
>
Hi All,
I know that I'm not a regular around here - but just a few things to
consider in this discussion.
Whilst measuring the rate of decay in a single detector signal is
representative of the decay rate of an isotope, the errors associated with
doing so are non trivial. In addition to this, ca
That was a very interesting article. I'd vote for the neutrinos -
they must be good for something. Hey, what if neutrinos are actually
what makes radioactive decay possible, and the randomness of the
decays is just the randomness of arrival of the right kind of
neutrino or combinations of them
Jim,
That's why I suggested a scintillator, PMT, and SCA. The intensity of the
detected light pulses varies w/ the energy of the decay. The SCA has upper
and lower levels (a window) so only the decays of the wanted isotope,
lying in the window, are detected. Decay product events will be screened
o
On 8/3/11 2:20 PM, Brooke Clarke wrote:
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 so
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, wh
In message <4e39c16d.9020...@pacific.net>, Brooke Clarke writes:
>Yes. I think using the isotope with the shortest half-life will make
>for the most sensitive measurement, nest pas?
Not so fast, or rather: not too fast. You need to be able to detect
as high a percentage of all events as possib
Hi John:
Yes. I think using the isotope with the shortest half-life will make
for the most sensitive measurement, nest pas?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/
J. Forster wrote:
You measure the number of counts in a constant time interval. That
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
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
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
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 mai
tories.org/radscout.html
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: Wednesday, August 03, 2011 12:14 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Variation in Radioactive Decay Rate with S
In message <2067.12.6.201.209.1312398859.squir...@popaccts.quikus.com>, "J. For
ster" writes:
>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.
For that you should try a couple of hundred miles north
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 su
Hi John:
Very interesting. I wonder if it's something that can be observed in a
home system?
I've got some radioactive samples and various counters that detect their
particles as well a precision time equipment.
http://en.wikipedia.org/wiki/Radioactive_decay#Changing_decay_rates
Have Fun,
B
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