The selectivity of a rapid 90Sr bioassay technique over 241Am, 238/239Pu, 210Po, 137Cs and 60Co has been investigated. Similar to 90Sr, these radionuclides are likely to be used in radiological dispersive devices. The purpose of this study was to demonstrate the degree to which the 90Sr bioassay technique is free from interference by these radionuclides if present in a urine matrix. The interfering radionuclides were removed (from 90Sr) by their retention on an anion exchange column. While, recovery of the target radionuclide (90Sr) was found to be ≥ 90 %, contributions from 241Am, 242Pu and 208Po were found to be ≤ 3 % indicating minimal interference from these radionuclides. The breakthrough for 60Co, however, was found to be ≤19 % indicating that it will have some interference contribution to the 90Sr measurement if present in the urine sample. As 137Cs was not retained at all by the anion exchange column, the method as such was not selective over 137Cs. However, a slight modification of the method through the ammonium molybdophosphate treatment quantitatively removed Cs from the urine sample, thereby; making it selective for 90Sr despite any 137Cs that is present.

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Journal Radiation Protection Dosimetry
Sadi, B.B. (Baki B.), Li, C. (Chunsheng), Bahraini, N. (Negar), Lai, E. P, & Kramer, G.H. (Gary H.). (2010). Selectivity of 90Sr urine bioassay technique over 241Am, 238/239Pu, 210Po, 137Cs and 60Co. Radiation Protection Dosimetry, 141(2), 205–209. doi:10.1093/rpd/ncq161