Abstract: According to the national standard GB/T 4835—2008 and the verification regulation JJG 393—2003 for radiation protection instrumentation, 40 radiation protection γ monitors of different types were tested using X and γ reference radiation devices of the radiation metrology station of China Institute for Radiation Protection (CIRP). Judging by the test results of these monitors in terms of repeatability, relative intrinsic error, energy dependence of response, angle dependence of response, and alarm sound, it is known that about 50% of these monitors fails to meet the standards.

Key words: γ radiation monitor, repeatability, relative intrinsic error, energy dependence of response, angle dependence of response