Calamosca M, Penzo S
ENEA-IRP, Montecuccolino, Via dei Colli, Bologna, Italy.
Radiat Prot Dosimetry. 2010 Oct;141(4):468-72. doi: 10.1093/rpd/ncq222. Epub 2010 Sep 16.
To check the consistency of a (220)Rn measurement, performed by passive alpha track detector (ATD), the use of an accurate (220)Rn exposure calibration facility is mandatory. The ENEA Radon Service developed a new CR-39 ATD-Tn, coupled to the radon ATD-Rn and, to assess its sensitivity, had to design a small calibration facility, which has been recently modified to improve the spatial homogeneity exposure conditions inside the chamber, to get a continuous monitoring of the (220)Rn concentration and to reduce radon contamination. A better knowledge of the circuit response allowed selecting the best-operating conditions and how to regulate the thoron concentration. The active thoron monitor has been changed to serve as a continuous sampling and measuring device rather than a grab one; particular care has been devoted to assess the (216)Po losses on the device's inner surfaces and to evaluate the chamber transit time correction factor.
为检查被动式α径迹探测器（ATD）所进行的²²⁰Rn测量的一致性，必须使用精确的²²⁰Rn暴露校准设施。意大利国家新技术、能源和可持续经济发展署（ENEA）氡服务部门开发了一种新型CR - 39 ATD - Tn，它与氡ATD - Rn相耦合，为评估其灵敏度，不得不设计一个小型校准设施，该校准设施最近已进行了改进，以改善腔室内的空间均匀性暴露条件，实现对²²⁰Rn浓度的连续监测并减少氡污染。对电路响应有了更深入的了解后，能够选择最佳运行条件以及如何调节钍射气浓度。有源钍射气监测仪已被改造为用作连续采样和测量设备而非瞬时采样设备；已特别关注评估²¹⁶Po在设备内表面的损失以及评估腔室传输时间校正因子。
