Cohen B L
Health Phys. 1986 Aug;51(2):175-83. doi: 10.1097/00004032-198608000-00002.
A survey of 222Rn levels in 453 houses of physics professors from 101 universities in 42 states (plus the District of Columbia) was carried out with 1-y exposures of nuclear track detectors, accompanied by an extensive questionnaire. The geometric mean concentration was 38 Bq/m3 (1.03 pCi/l), the standard deviation was times divided by 2.36, and the arithmetic average was 54 Bq/m3 (1.47 pCi/l). Correlations were studied with age of the house, environs, location of the detector in the house, number of floors in the house, what is beneath the house, integrity of the barrier between the house and the ground, wind conditions, draftiness, construction materials, ventilation, use of gas, and source of water. In general, these correlations were found to be much weaker than expected, indicating that geographical variations are the dominating effect.
对来自42个州（加上哥伦比亚特区）101所大学的453名物理教授家中的222Rn水平进行了调查，使用核径迹探测器进行了1年的暴露，并附带了一份详尽的问卷。几何平均浓度为38 Bq/m³（1.03 pCi/l），标准偏差除以2.36，算术平均值为54 Bq/m³（1.47 pCi/l）。研究了与房屋年龄、周边环境、探测器在房屋中的位置、房屋层数、房屋下方的情况、房屋与地面之间屏障的完整性、风况、通风性、建筑材料、通风、燃气使用和水源的相关性。总体而言，发现这些相关性比预期的要弱得多，表明地理差异是主导因素。
