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本文介绍在１９９２年７月至１９９３年７月期间，用两种固体核径迹探测器对北京某煤矿氡水平进行的调查。“杯式探测器”可以同时测量氡浓度及平衡因子，布放于井下２３个监测点，测得井下氡浓度平均值为７０６±３８Ｂｑ／ｍ３，平衡因子平均值为０．３４±０．０５。氡浓度的变化规律为秋冬季低、春夏季高，平衡因子则反之。另外，在“矿工”（下井时间较长）和“技术管理干部”（下井时间较短）两个人群各选择了１０名，胸前佩带“袋式探测器”，测得其暴露处年平均氡浓度分别为１３１和９９Ｂｑ／ｍ３。根据他们各自的停留时间，扣除井上氡的影响，估算得井下氡及氡子体对他们造成的年个人有效剂量分别为２．７和１．５ｍＳｖ。
This article describes the survey of radon levels in a coal mine in Beijing from July 1992 to July 1993 using two types of solid nuclear track detectors. “Cup detector” can measure radon concentration and balance factor at the same time, and put it in 23 underground monitoring points. The measured average radon concentration in the underground is 706 ± 38Bq / m3, and the average balance factor is 0.34 ± 0.05 . The variation of radon concentration is low in autumn and winter, high in spring and summer, balance factor is the contrary. In addition, 10 people were selected for each of the “Miners” (with a longer downhole time) and “technical management cadres” (with a shorter downhole time), and a “pocket detector” was worn on their chest to measure the annual average exposure Radon concentrations were 131 and 99Bq / m3, respectively. According to their respective residence time, deducting the influence of uphole radon, it is estimated that the annual individual effective doses caused by underground radon and radon progeny are 2.7 and 1.5mSv respectively.