Standard general methods for analysis of radioisotopes
Various methods are described for the analysis of radioisotopes. The methods discussed are heavy metal spot test, gross ..beta..-particle count, aluminum absorption curve, determination of ..gamma..-emitting impurities, free acid, total solids, and nonvolatile materials. The presence of heavy metals in a solution of radioisotopes is indicated by their precipitation with hydrogen sulfide. Gross ..beta.. particle counting applies to the counting of ..beta.. particles having a maximum energy of 0.220 MeV or greater and is used primarily for assay of radioisotope products of specific activities that are sufficiently high that solids left after evaporation of a sample on a mount are less than 1 mg/cm/sup 2/. Approximate energies and intensities of ..beta..-ray sources in radioactive sources are determined by an aluminum absorption curve method. Gamma impurities are determined by ..gamma.. spectrometry using a Tl-activated NaI crystal as a detector. Simple measurement of pH of the radioisotope solution using pH paper or a pH meter gives a determination of the free acid, and total solids are measured as that material which does not evaporate or ignite at a temperature sufficient to evaporate the mineral acids. Materials remaining after the sample has been heated to a temperature sufficient to convert C to CO or CO/sub 2/ is termed nonvolatile material. (BLM)
- OSTI ID:
- 7246238
- Journal Information:
- Annu. Book ASTM Stand.; (United States), Journal Name: Annu. Book ASTM Stand.; (United States) Vol. 45; ISSN ASTSA
- Country of Publication:
- United States
- Language:
- English
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