新型人工核素气溶胶监测仪设计

Development of New Type Artificial Nuclide Aerosol Monitor

针对核设施人工放射性气溶胶与氡钍子体粒度具有明显差异,利用这种差异,设计了一种带有氡子体与人工放射性核素粒度分离、负压抽真空已达稀薄空气层的监测仪器。实现进一步降低天然辐射氡钍子体干扰,提高监测灵敏度。实验测试结果表明:以最小可探测活动衡量方式的探测灵敏度较无粒度分离装置提高2〜15倍;该技术在人工放射性与天然氡钍子体粒度有显著差异,氡钍子体水平越高,优势越明显。

A new prototype radioactive aerosol monitor with particle size separation and thin air layer vacuum pumping teach was designed and developed to improve the detection sensitivity according the big difference particle size between radon progeny and artificial radionuclide in very special situation and reduce air absorbing effect.Developed monitor was tested,and results show detection sensitivity was improved 2 to 15 times compare with tradition method base on applied in very special situation.Detection sensitivity of monitor with new method will be improved more with the increase of radon level compare with traditional method in the very special situation.