Research of Radioisotope Production with Fast Neutrons, (VII)

SHIKATA Eiji

doi:10.3327/jnst.1.228

Production of radioisotopes of high specific activity was studied in the JRR-1 reactor using several (n, p) and (n, α) reactions, such as ²⁴Mg(n, p)²⁴Na, ²⁷Al(n, α)²⁴Na, ³⁵Cl(n, p)³⁵S, ³⁵Cl(n, α)³²P, ⁵⁸Ni(n, p)⁵⁸Co, ⁶⁴Zn(n, p)⁶⁴Cu and ⁶⁷Zn(n, p)⁶⁷Cu. The target materials for these reactions were irradiated in several experimental holes of JRR-1 and the radioisotopes formed in the target materials were separated. The amount of the radioisotopes produced and the specific activity were determined, and the possibility of producing high specific activity radioisotopes by these reactions was investigated. The specific activity of the radioisotopes produced by the (n, p) and (n, α) reactions was more than several hundreds times higher than when produced by the corresponding (n, γ) reactions. Although the yield of the radioisotopes by the former two reactions was fairly small, practical production of high specific activity radioisotopes by this method was thought to be possible, at least for elements of lower atomic number such as those studied in the present work.<BR>For each experimental hole, the thermal and the fast neutron fluxes were determined respectively by the reactions ¹⁹⁷Au(n, γ)¹⁹⁸Au and ⁵⁸Ni(n, p)58Co. In order to apply these (n, p) and (n, α) reactions effectively to radioisotope production, such basic informations as the dependence of the reactions on neutron energy and the effect of irradiation position on the reaction yield were studied on the basis of the neutron flux distribution, and the cross section of the reactions for fast neutrons in JRR-1 was estimated.

Research of Radioisotope Production with Fast Neutrons, (VII)

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