Abstract
Long-lived gamma-emitting radionuclide activity forming in the 6Li-D converter neutron field measurements and calculations were conducted for some ITER construction steels. Activation foil method and unfolding techniques were used to measure the neutron flux density; the mean neutron flux density was 2.03E13n/(cm2s) whereas total fluence equalled 9.87E18cm−2. The activity measurements were done by means of gamma-ray spectrometry. Activity calculations were done by means of FISPACT-II code and experimentally determined neutron flux. Long-lived gamma emitting radionuclides activity in steel samples was, in average, about 1.9MBq/g 1year after activation; the dominant radionuclides were 60Co, 54Mn and 58Co (about 52%, 24% and 20% of total activity respectively). The calculated to experimental values ratio (C/E) for particular radionuclides varies generally in range from 0.52 for 57Co to 1.38 for 51Cr.
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