Thinking about this could the doublet at ~2.6MeV be Th230 and Tl208? The latter has an emission energy at 2.614MeV and the former at 2.694MeV? Is it possible that I am detecting Tl208 decay in the Tl present in the NaI crystal?
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Steve, Thanks. As an example of the data that I am getting, I am enclosing three background runs taken in my garage (the house has too much granite to generate nice spectra!). The overlay of the 24hr data sets is as follows: Red line - No shielding - total counts 5.1 x 10^6 Blue line - Detector unde...
As a recent buyer of a NaI probe and a GS-USB-PRO, I am trying to figure out the best way to acquire spectra of low activity sources. I have always assumed that as long a count time as possible is better from a signal to noise point of view, but at what point is there a diminishing return on the tim...