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Originally Posted by Seden
It will be interesting building and testing it. Have read quite a bit about Gamma Spectrometry and it appears the challege will be calibrating the unit. Very impressive papers showing the spectrum of different metals,this is truly an LRL backed by science. How did Dr. Bickel calibrate his units?
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Hi Seden,
He measured the signal returned by the photomultiplier tube and then adjusted his filters and pulse traps to catch the flashes of light that corresponded with the stable gold isotope. He said the isotope detector would not work when using inferior scintillating crystals. He could not use the crystals made by the US manufacturers. He had access to foreign sources that usually only sell to government agencies. Bickel said the crystals he used were the best in the world, but their scintillating properties would deteriorate over a period of 5 years, making it necessary to replace the crystal for good performance.
Best wishes,
J_P