Gamma radiation spectroscopy - using a reference source to stabilise readings in geological surveying

摘要

The changes in ambient conditions of pressure and temp. can have significant effects on the readings of a gamma radiation survey of rock structures. A reference source, pref. sodium 22, with a coincident output of gamma and beta radiation is used as a base of a stabilising system. An electronic legic circuit is used to identify the gamma radiation from the reference by coincidence with the detection of the beta radiation, and the known output of the source is compared with the measured output to provide a correction factor to the survey readings.