here is my PMT head with the cristal and the shielding with Pb and Cu.
The crystal with the dimensions 1"3/4 x 2" is surrounded of a protective case made from aluminum. The PMT is made from EMI , Type 9656B (an old one). The whole measuring head PMT with preamplifier and crystal comes from Siemens. If there is a better shielding there so I am very glad about an idea.
How to build the perfect shield for your measurements? Discuss it here!
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