先進核融合中性子源（A-FNS）計画における99Mo/99mTc製造の概念検討

A plan of an advanced fusion neutron source (A-FNS) by using d-Li reaction is being developed at Rokkasho-site of National Institutes for Quantum and Radiological Science and Technology (QST). Although a main objective of the A-FNS facility is the fusion material irradiation, application researches using fusion neutrons are being investigated. We calculate production yields of 99Mo, which is its parent nuclide of 99mTc and is important in medical diagnosis, as one of the applications in order to evaluate potential abilities of the A-FNS. A modified IFMIF test cell design for the A-FNS is used for the calculation of the production of 99Mo by using McDeLicious-11 code, FENDL-3.1b and FENDL/A-3.0 nuclear data libraries. At a surface position of high flux test module, we estimate 83 TBq activity of 99Mo which is obtained from 100Mo(n,2n)99Mo reaction in a 2-day irradiation for a 100%-enriched 100Mo sample of 250 g. This amount covers almost all of the demand in Japan per week. Usage of a natural molybdenum sample is also a promising candidate as an inexpensive 99Mo production method, because 98Mo(n,g)99Mo reaction has large capture cross sections in the resonance energy region