I think there is every possibility that what is measured is a secondary, Bremstallung like effect.

One other factor is that whatever is being measured is outside the alumina and steel container of the active ingredients of the glow stick.  If the gamma was generated from the 'active ingredients' some would be absorbed by the alumina and steel, and absorbance normally increases at low energies, so having the largest gamma emmision at the low energies is counter intuitive. Interestingly this puts the results in a similar place to Vladimir Vysotskii's measurements of gamma rays from water cutting systems, where the peaks is at 1 to 5 kHz.  He came to the conclusion that what he was measuring was a secondary effect as a result of interaction of primary energy/particles that was being released with the outer surface of the steel container.  Perhaps that is also what is being seen here.  It would be interesting to know where the low energy peak was.  Could it also have been in the 1-5kHz region perhaps, in which case this could be very similar to the Vysotskii result.


On 11/03/2018 00:13, Bob Higgins wrote:
Neutral particle flux probably won't create substantial electromagnetic noise and certainly no gamma.  Best case is that it would occasionally knock off some electrons that would excite the characteristic x-ray emission of their host atom.  They will excite acoustic noise that would quickly be converted to heat.

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