BS ISO 13165-3. Water quality. Radium-226. Part 3. Test method using coprecipitation & gammaspectrometry Water, Quality, Water testing, Sampling methods, Water resources, Water pollution, Industrial water pollutants, Chemical water pollutants, Biological water pollutants, Effluents (sewage), Sludge, Sediment, Experimental design, Flow measurement, Sampling equipment, Samples, Test specimens