Abstract: In order to accurately measure the H'·(0.07) under emergency conditions, a directional dose equivalent rate meter for emergency radiation protection is developed. The detector conta: 2 layers 3 μm alumini polyester film, a diameter of 35 mm Plastic scintillators with thickness of 50 μm, plexiglass with a thickness of 5 mm, and SiPM. They were used as the front window, scintillator, photoconductive and photoelectric converter of the detector in turn. According to GB/T 4835.2—2013, the radiation characteristics of the developed directional dose equivalent rate meter for emergency radiation protection are as follows: the relative intrinsic error is -14% to +20% in the dose rate range of 70 μSv/h-1.7 Sv/h; With the incident angle from 0 to ±60°, and the β ray average energy of 60 keV-800 keV, the variation of radiation energy and incident angle is in the range of -16% to +48%; in the radiation field of 0.23 mSv/h, the statistical fluctuation of the measurement results is 8.4%. The test results show that the radiation characteristics of the directional dose equivalent rate meter for emergency radiation protection meet the requirements of GB/T 4835.2—2013, and can be used for directional dose equivalent rate monitoring in places with high weak penetrating radiation and emergency conditions.

Key words: emergency radiation protection, weak penetrating radiation, H'·(0.07), plastic scintillator, SiPM