Abstract
Trace elements in a vehicle exhaust particulates environmental reference material (NIES No. 8) prepared by the National Institute for Environmental Studies were determined by an instrumental neutron activation analysis method (INAA). The vehicle exhaust particulates samples (ca. 150-550mg) were irradiated by neutrons for a short time (30s) and a long time (5h) at Musashi Institute of Technology Research Reactor (MITRR). Samples were irradiated by two methods: namely, thermal neutron irradiation without cadmium filter and epithermal neutron irradiation with cadmium filter. Activated samples were measured by four methods: γ-ray spectrometry, anticoincidence counting, coincidence counting and low energy photon spectrometry using a planar Ge detector LEPS). Concentrations of 52 elements were determined by these irradiation and counting methods.
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