Determination of Q0 and k0 factors for 75Se and their validation using a known mass of Se on cellulose

Q0 and k0 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±3 mg kg−1 was added on cellulose in low amounts, to avoid self-shielding effects of the matrix element. The difference between Q0 value obtained in this study differed from the literature value by −9.2%, while the k0-factors for five recommended gamma lines differed from −3.3% for the 400.7 keV line up to +13.1% for the 121.1 keV line. Taking this into account, the differences in the Se content of a sample differed from −9.1% for the 121.1 keV line up to +6.3% for the 400.7 keV line.