Study on Electron Drift Time in Ionization Chamber for Radon Measurement [无场笼电离室电子漂移时间研究]

作者：Wu M.-Z.; Liu Q.; Li P.; Hou B.-L.; Wang A.-Q.; Qi Y.-Q.

来源：Nuclear Electronics & Detection Technology, 2022, 42(1): 131-136.

• Electron Drift Time
• Field Cage
• Ionization Chamber
• Radon Emanation Measurements

The online radon measurements can be achieved by ionization chamber with highly sensitive electronics. The accuracy is limited by the radioactive background of the detector, so that not to use field cage in ionization chamber was proposed. We set up a prototype without a field cage, and did a beam test at the E3 beam line of BEPC. The result is that the electric field near the edge can be 3 times more than that of the central area. The drift time of primary electrons is (1.13±0.44) μs in central area, while it can reach (1.99+1.13) μs in the total prototype. Therefore, it is necessary to take a full consideration to the signal rising time to promote the detection efficiency without using the field cage.

• 单位
  西南大学; 中国科学院大学; 核探测与核电子学国家重点实验室; 中国科学技术大学