Gross alpha and gross beta measurement context
EPA Method 900.0: a measured volume of water is evaporated onto a planchet, and the alpha and beta particles given off by the dried residue are counted in a gas-flow proportional counter. The result is a screening measure of total radioactivity, reported in picocuries per liter (pCi/L); it does not identify the radionuclides.
Define the specialty measurement
State the isotope, fiber or chemical-form question as applicable. A total, gross or combined measurement does not automatically answer a species-specific question.
Include the complete project requirement
Provide the matrix, target analytes, required method, fraction, units and reporting limits. Include the permit or monitoring instructions where results will support a regulatory submission. Naming this method does not establish blanket compliance eligibility.
Resolve collection before sampling
Use the bottle, preservation and delivery instructions assigned to the agreed scope. Identify each location and collection time, and document any deviation. The final analytical plan must fit the submitted material and its intended use.
Related testing & guidance
Technical & service references
Vanguard service detailsSource review: November 8, 2026. The agreed method and project scope govern the testing.