Abstract: The design and construction plan of a radiation testing field in west Guangdong is introduced. A RSS131 high-pressure ionization chamber is used as the transfer instrument to test the calibration coefficient and cosmic ray response of portable radiation monitors, 6150AD and FH40G, under different measurement conditions. The results show that when the maximum gamma dose rate in the field is less than 500 nGy/h, it is more suitable for linear fitting to calculate the cosmic rays response. When it is greater than 500 nGy/h, the calibration coefficient is more suitable to be calculated via linear fitting.

Key words: Radiation testing field, High pressure ionization chamber, Cosmic ray response, Calibration coefficient