Cliff K D
Phys Med Biol. 1978 Jul;23(4):696-711. doi: 10.1088/0031-9155/23/4/011.
Calculations of the activity concentration of RaA (218Po) in the air within living rooms and in the outside air were made at 87 dwellings in England and Scotland. From these measurements together with a determination of the ventilation rate existing in the room at the time of the measurements, the rate at which 222Rn is emanating from room surfaces into room air in pCil-1 h-1, can be calculated. For the dwellings studied the mean emanation rate is 0.54 pCil-1 h-1 and on the basis of a mean ventilation rate of one room change per hour throughout the year and assuming an occupancy factor of 0.8 the population exposure rate for the population of Great Britain to the short-lived daughters of 222Rn is estimated to be 0.15 Working Level Months per year.
在英格兰和苏格兰的87处住宅中，对客厅内空气和室外空气中镭A（218Po）的活度浓度进行了计算。根据这些测量结果以及对测量时房间内通风率的测定，可以计算出222Rn从房间表面散发到室内空气中的速率，单位为pCil-1 h-1。对于所研究的住宅，平均散发率为0.54 pCil-1 h-1，基于全年每小时换气一次的平均通风率，并假设居住系数为0.8，估计大不列颠人口因222Rn的短寿命子体而受到的年暴露率为每年0.15工作水平月。
