SummaryTwo high-purity germanium coaxial detectors, having opposite electrode con figurations from one another, but fabricated from the same germanium crystal, were pen irradiated simultaneously with fast neutrons from an unmoderated Cf source.Both detectors were 42 mm diam. The detector having the conventional electrode configuration was about 28 times more sensitive to radiation damage than was the detector having the p contact on the coaxial periphery.These results prove that germanium coaxial detectors having the conventional electrode configuration should not be used in any situation subject to significant radiation damage. This conclusion was anticipated because the defects produced by neutron and proton irradiation of germanium act predominantly as hole traps.

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UCRL-10030Sturdy silicon transmission counters as thin as 0.0012 in. were produced and used in conjunction with a passive pulse-adder circuit which combined the dE/dx and E pulses so that the nonuniformity and energy straggling in the transmission counter would not decrease the resolution of the energy spectra. Construction and performance of these counters are described.-1-

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