氡源 ----氡析出固体矿石粉氡源 具有稳定的氡射气系数，满足来氡析出水平与密闭容器中氡浓度水平的理论计算与实验方法要求，形成了一套专用的检验方法与操作程序。经标准氡室校准，其氡析出水平为1.18 Bq/（m2·s），稳定性在5%误差以内。
这是一个巨大的剂量，因为我们每年从氡之类的天然源接收到的辐射平均只有2.4毫西弗茨。
That's a huge dose when you consider that each year we receive an average of 2.4 millisieverts from natural sources such as radon.
无源的缓解系统已显示有能力使室内氡的水平降低多达50%。
Passive systems of mitigation have been shown to be capable of reducing indoor radon levels by up to 50%.
在通过试验确定上述方法后，对全国各地模型体源进行了氡泄漏和湿度测量，使模型体源的量值达到了更高程度的统一。
The radon leakage and moisture of the body source models throughout China have been measured and the normalized value of quantity of all body source models has been determined.
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