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Studies on the feasibility of production of57Co by alpha bombardment of Mn and Ni targets

Authors:	M K Das N Ramamoorthy B R Sarkar R S Mani

Institution:	(1) Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Trombay, 400085 Bombay, India

Abstract:	We have studied the feasibility of producing⁵⁷Co (271.3 d) via the⁵⁵Mn(, 2n)⁵⁷Co reaction (⁵⁵Mn–100%). The thick target yield of⁵⁷Co in the 28 to 18 MeV energy region was measured as 3.87 Ci/Ah. However, the proximity and overlap of the excitation functions for (, n), (, 2n) and (, 3n) reactions on⁵⁵Mn are such that the production of pure⁵⁷Co in high yields free of⁵⁸Co (70.8 d) and⁵⁶Co (78.8 d) has not been feasible. We have also studied a new method for ancillary production of⁵⁷Co via the reactions⁵⁸Ni(, p)⁵⁷Co and $^{58} Ni(\alpha ,\alpha n)^{57} Ni\xrightarrow{{36{\mathbf{ }}h}}^{57} Co$ during the course of producing⁶²Zn by⁶⁰Ni(, 2n)⁶²Zn reaction. In this case the yield of⁵⁷Co of reasonable purity has been up to 1 Ci/Ah.

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