A radiation detector (1) useful for well-logging and other applications contains a stabilizing pulsar device (7) comprising a scintillator (21) coupled to a photodetector (9) and including a radioactive source (27) such as Am241 which simultaneously emits X-rays and low energy particles such as alpha or beta particles upon decay. The pulsar device (7) is coupled to the radiation detector (1), which utilizes a scintillation crystal (17) and a photodetector (5), and the outputs (8, 10) from the two photodetectors (5,9) are processed through a coincident/anticoincident gate (11, 13, 15) alternately to stabilize the X-rays or to read the environmentally-induced radiation.
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