In addition to Part 136 methods, some approved industry-specific methods are published or incorporated by reference at 40 CFR Parts 401 through 503.
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- 900.0: Gross Alpha and Gross Beta Radioactivity in Drinking Water (PDF)(10 pp, 142 K, 1980)
- 903.0: Alpha-Emitting Radium Isotopes in Drinking Water (PDF)(8 pp, 128 K, 1980)
- 903.1: Radium-226 in Drinking Water (Radon Emanation Technique) (PDF)(12 pp, 179 K, 1980)