Search

Abstract: Q 0 and k 0 factors for 75Se were determined by means of the Cd-ratio and Cd-subtraction methods at the carousel facility of the TRIGA Mark II reactor. For their determination, certified Se standard solution (no. 70350, p.a., Merck, Darmstadt, Germany) containing 988±3mgkg−1 was added on cellulose in low amounts, to avoid self-shielding effects of the matrix element. The difference between Q 0 value obtained in this study differed from the literature value by −9.2%, while the k 0-factors for five recommended gamma lines differed from −3.3% for the 400.7keV line up to +13.1% for the 121.1keV line. Taking this into account, the differences in the Se content of a sample differed from −9.1% for the 121.1keV line up to +6.3% for the 400.7keV line. [Copyright &y& Elsevier]

Iodine is one of the most important essential elements as demonstrated by the fact that its deficiency can cause goitre. Nevertheless, quantitative data on its concentration in biological materials, especially in the human brain, are scarce. There is therefore a demand for accurate and reliable information on iodine in these types of samples. The purpose of the present work was to determine the concentration of total iodine in some control human brain parts by rapid radiochemical neutron activation analysis. Our second goal was to determine I distribution between lipid fraction and in brain tissue without lipid by applying two types of solvent extraction methods. The results were checked by the analysis of biological standard reference materials with certified or literature values for iodine and good agreement was found.