该方法基于酸化样品以使其稳定、蒸发至几乎干燥、转化为硫酸盐形式并在350°C下点火、将一部分残留物转移到planchette并在α粒子检测器中计算α活性。涵盖非挥发性（350°C时）α活性放射性核素，可扩展至盐水或矿化水，但灵敏度降低。适用于原水和饮用水的分析。

The method is based on acidifying the sample to stabilize it, evaporation almost to dryness, conversion to the sulfate form and ignition at 350 °C, transfer of a portion of the residue to a planchette and counting alpha-activity in a alpha-particle detector. Covers non-volatile (at 350 °C) alpha-active radionuclides and can be extended to saline or mineralized waters, but with a reduced sensitivity. Applies to the analysis of raw and potable waters.