ABSTRACT

Electrostatic precipitation is a well-known technology to reduce public exposure to radon daughters. A custom electrostatic precipitator (ESP) prototype has been designed and built to study the effectiveness of such a removal technique in specific workplaces having low-to-zero air exchange rates with external environments. An appropriate mathematical model has been set up in order to simulate the behavior of environmental and nuclear data throughout the ESP operation, to optimize the design for the prototype to be built, to estimate its effectiveness in terms of effective dose reduction. Reference detectors have been used to measure both the radon concentration and the potential alpha energy concentration of its decay products. After a full calibration procedure, two main experiments have been performed in a room satisfying the requirements of very low ventilation rate and high radon concentration. The effective dose rate after an ESP continuous working period of either 3 h or 5 h turned out to be 50% lower than the value measured before ESP switching ON. The main contribution to dose reduction was found to be given by the first 2 hours of operation.

摘要

静电沉淀是一种众所周知的技术，可以减少公众对ra子的暴露。已设计并构建了定制的静电除尘器（ESP）原型，以研究这种去除技术在与外部环境之间空气交换率低至零的特定工作场所中的有效性。已经建立了适当的数学模型，以便在整个ESP操作过程中模拟环境和核数据的行为，优化要建造的原型的设计，以有效减少剂量的方式评估其有效性。参考检测器已用于测量the浓度及其衰变产物的潜在α能量浓度。经过完整的校准程序后，在满足低通风率和高ra浓度要求的房间内进行了两个主要实验。在ESP连续工作3小时或5小时后的有效剂量率比在ESP接通之前测得的值低50％。发现对减少剂量的主要贡献是在手术的前两个小时。