Abstract
This papar deals with the results of the experimental work of the study on 3He bombardment on natural chromium target with the aim of production of 52Fe in practical amount for medical use.
The excitation curves and thick-target yield curves were measured for the formation of"Fe and other by produced radioisotopes such as 52Fe, 55Fe, 56Mn, 48Cr, 49Cr, 51Cr and 48V, formed while bombarded with 3He particle up to 44 MeV. Also various conditions in the production procedure, especially the yield of"Fe and other byproduced radioisotopes under most adequate incident energy, were examined.
The method used was as follows The stacked metallic chromium plates (each of c/ 30 mm, 20-40 mg/cm2) was made into sufficient thick-target for the bombardment in the ranges of the incident particle energy in the cyclotron, followed by chemical separation of the iron radioactivities or undestructively, and the activities of relative long-lived products formed in each target were measured with calibrated scintilation counter and proportional counter. The excitation curve of 52Fe shows a maximum of 5 mb near 35 MeV energy. The average thick-target yields of 52Fe for 40 MeV incident energy is 50, uCi/gAhr and the 55/52Fe ratio is 0.07%.
It is a superior advantage for medical use that this ratio is very small in comparison with that for Q particles bombardment on natural chromium target.
Thus the production method of 52Fe via the 3He-reaction on natural chromium proved to be superior to other possible reactions in its high yields as well as in other points.
