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AbstractAbstract
[en] Full text: For a small sample measured at the closest position to a Ge detector, the peak efficiency is 30-40 times as high as that at the 15 cm position. However, INAA results from this or similar counting positions are often accompanied with poorer accuracy, because peak efficiency at the low counting position is much more sensitive to counting geometry. As a common practice in INAA, whenever possible, far counting distances are used, particularly for works designing good accuracy. The price paid for it is high: poor detection limits or less detectable elements, long counting time or poor counting statistics, and long turnout time or low throughput. The internal comparator method is a solution, which promises reliable INAA results also from the closest counting position for samples with even 'bad' geometry. When the content of the internal comparator in sample is determined independently, this method can be used in INAA of materials suffering from thermal neutron self-shielding. In this work, feasibility and performance of this method was demonstrated by an analysis of SRM1575a (pine needles), an unknown sample from ASTM Task Group inter-laboratory comparison sponsored by NIST. 28 elements were successfully determined and reported in a short period. Application of this method in analyses of glasses having much B and Cd is presented. To apply the internal comparator method, the k0-method must be available. (author)
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International Atomic Energy Agency, Vienna (Austria); 156 p; 2003; p. 6; International conference on isotopic and nuclear analytical techniques for health and environment; Vienna (Austria); 10-13 Jun 2003; IAEA-CN--103/025
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