Abstract: In view of the poor performance of dosimeters for low energy β rays monitoring in China, a ZF-P7 H_p(0.07) dosimeter was developed, based on LiF:Mg,Cu,P thermoluminescence detector and combined with simulation calculation, in order to solve the problem of accurate measurement of H_p(0.07) dose in β and γ mixed fields. The performance test results of ZF-P7 H_p(0.07) dosimeter are as follows: For the maximum energy of 225 keV-2.274 MeV of β rays, the energy response ranges is 0.67-0.95; For energies between 16 keV to 1 250 keV of X or γ rays, the energy response ranges is 0.66-1.45; Within the range of 100 μSv-1.2 Sv, the dose linearity is 0.91-1.10; Under the X radiation of 65 keV and angle range of 0° to ±60 °, the angle response of -60° to 60° is 0.99-1.09; Under the β radiation of ⁸⁵Kr, the angle response of -60° to 60° is 0.94-1.11. According to the measurement results, the performance of ZF-P7 dosimeter meets the requirements of EJ/T 1178—2005 and JJG 37—2014. Because the ZF-P7 dosimeter has excellent performance, especially the radiation response is good at X,γ,β mixed radiation filed, which can solve the problem of operators’ H_p (0.07) dose monitoring in the mixed radiation fields. It can be widely used in the H_p(0.07) dose monitoring for workers in the mixed radiation fields.

Key words: weak penetrating radiation, H_p(0.07), β/γ mixed fields, thermoluminescence detector