Abstract
Aerosol samples were collected on cellulose acetate filters at Station Nord, Greenland by the National Environmental Research Institute of Denmark as part of an ongoing Arctic environmental research program. These samples were then given to the Rise National Laboratory in Denmark for evaluation by neutron activation analysis (NAA). Even though loss-free counters have been available for some time, little information has appeared in the literature on their use for actual samples. The filters were irradiated in the DR3 reactor and then counted using a GAMMA-X high purity germanium (HPGe) detector with a Nuclear Data ND 599 loss-free counting (LFC) module. A wide range of dead-times was encountered in the analysis of these samples, and LFC was useful in accommodating for the different dead-times. In some cases the fast decay of isotopes over the counting period along with pulse pile-up problems would have made the use of other dead-time correction methods unreliable. The LFC system was tested for reproducibility of results at high dead-time values. Similar tests were run on a system not equipped with a LFC module and the results were used as a comparison.
Original language | English |
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Journal | Journal of Trace and Microprobe Techniques |
Volume | 14 |
Issue number | 1 |
Pages (from-to) | 87-101 |
ISSN | 0733-4680 |
Publication status | Published - 1996 |