Analysis and Verification of Anti-radiation Performance of Wireless Sensor Power Supply Components for Nuclear Power Plant

Wireless temperature and pressure sensors are miniaturized, integrated design, in order to meet the irradiation index of 1000 Gy in the nuclear environment, for the γ-ray energy and penetration of the characteristics of the large and very strong, the shielding structure of the whole package, that is, in addition to the sensor sensitive components, the signal conditioning circuits, wireless transceiver circuits, power supply circuits, and other modules are used in a full range of high-density materials to wrap. Among them, the power supply part is powered by lithium battery, which occupies a larger volume and has a larger cost of anti-irradiation shielding. In this paper, the radiation resistance of lithium battery is analyzed and verified by test. According to the test results, after the cumulative irradiation of 1198 Gy, the voltage change of lithium battery before irradiation decreases by 0.05 V at maximum, and the rate of change is 1.3%, which is a strong resistance to irradiation. Therefore, the wireless sensor anti-irradiation shielding design can be considered to move the lithium battery part of the overall shielding structure to reduce the shielding volume and weight, combined with the shielding body into the labyrinth or diagonal holes into the line, can not reduce the overall anti-irradiation capacity of wireless sensors to further optimize the miniaturization of the case of the design.