Cruz PAL, Loureiro JS, Bernardes EMO. Standardization of a 89Sr solution from a BIPM intercomparison using a liquid scintillation method.
Appl Radiat Isot 2002;
56:457-9. [PMID:
11842807 DOI:
10.1016/s0969-8043(01)00231-7]
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Abstract
A procedure to standardize 89Sr (as strontium chloride) solutions, within the frame of a BIPM intercomparison, by the CIEMAT/NIST method was presented for Instagel Plus, HiSafe III and Ultima Gold liquid scintillation cocktails. The stability was studied for two types of samples: those obtained by direct addition of the 89Sr solution and those by the extra addition of 0.5 ml of HCl (0.1 mol l(-1)) to the cocktails. The results only showed good stability with the three scintillants used when additional HCl was added to the cocktails. The activities per unit mass determined for 89Sr were: 26.344 kBq g(-1) for Instagel Plus; 26.335 kBq g(-1) for HiSafe III; and 26.310 kBq g(-1) for Ultima Gold (at a reference time of 2000.10.01, 00 h UT) with a total uncertainty of 0.5% in each case (k = 1).
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