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Discrete high u t i l i z i n g a Q 1 0 / s Am-Be neutron source through the radiation capture prooess. energy calibration and relative efficiency determination f o r y-detectors.

A modified method of absolute efficiency calibration for germanium detector has been developed based on the fact that the intensities of chlorine capture γ-rays can be determined by the 1368 keV γ-rays from sodium activation when a NaCl sample is irradiated by thermal neutrons. As a verification of this method, the intensity of the 4.44 MeV γ-ray from an Am-Be neutron source was determined.