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As you would expect, there are small differences between these end-window tubes and the claims made for them. For example, the Centronics ZP1400 is described as a beta/gamma tube, whilst LND's 7124 claims to be an alpha detector as well, though the areal density of the mica window is cited as between 2 & 3 mg/cm2 in both cases.
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Searching for an equivalent geiger tube to a PHILIPS ZP1400
