ISO 13161:2011规定了在各种天然水域中通过α光谱法测量210Po活性浓度。 该方法的检测限制取决于样品的体积，计数时间，背景计数率和检测效率。在饮用水的情况下，通常在原料样品上进行分析，无需过滤或其他预处理。 如果悬浮物必须被去除或分析，建议在0,45μm过滤。不溶性级分的分析需要未被ISO 13161:2011涵盖的矿化步骤。在这种情况下，对获得的不同相进行测量。最后的活动是所有测量活动浓度的总和

ISO 13161:2011 specifies the measurement of 210Po activity concentration by alpha spectrometry in all kinds of natural waters. The detection limit of this method depends on the volume of the sample, the counting time, the background count rate and the detection efficiency. In the case of drinking water, the analysis is usually carried out on the raw sample, without filtration or other pretreatment. If suspended material has to be removed or analysed, filtration at 0,45 µm is recommended. The analysis of the insoluble fraction requires a mineralization step that is not covered by ISO 13161:2011. In this case, the measurement is made on the different phases obtained. The final activity is the sum of all the measured activity concentrations.