1. US Environmental Protection Agency, National primary drinking water regulations; radionuclides; final rule, 40 CFR Parts 9, 141 and 142. FR 65(236), 2000, 76708.
2. US Environmental Protection Agency, Prescribed procedures for measurement of radioactivity in drinking water, Environmental Monitoring and Support Laboratory, EPA Report 600/4-80-032, Cincinnati, 1980.
3. American Public Health Association, Standard methods for the examination of water and wastewater, APHA 20th ed., Washington, DC, 1998.
4. American National Standards Institute, Calibration and usage of alpha/beta proportional counters, ANSI N42.25, IEEE, New York, 1997.
5. Experimental investigation of mass efficiency curve for alpha radioactivity counting using a gas-proportional detector