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Abstract
The production optimization of medical radioisotopes for various applications requires careful analysis of all production parameters. The importance of such radioisotopes in nuclear medicine cannot be overemphasized. During cross section calculations, experimentalist sometimes find more than one reported literature value of a certain parameter, each leading to a different effect on the overall cross sections. In the present work, we considered the effect of slight variations of density values of titanium reported in the literature on the experimental cross sections. Several reported density values (4.50, 4.51 and 4.54 g/cm3) were found in the literature, but only the lowest and highest values (4.50 and 4.54 g/cm3) were considered in this study. The said densities were used to calculate the cross sections of Ti(a, x)51Cr,46Sc radioisotopes. The corresponding trends of the excitation functions of 51Cr and 46Sc were analyzed for the selected density values. The calculated cross sections from the different density values have been analyzed and compared graphically to show the level of variations, as well as comparison with theoretical TALYS code calculated cross sections. About 1 percent variation of the cross sections have been observed. Following the observed slight variation in cross sections effect of the various density values, we recommend that IAEA could update its nuclear data service database to include recommended density values for all metals using reliable sources.
Highlights
Production cross sections of radioisotopes are important for their applications in nuclear medicine, astrophysical studies and many other fields
The experimental cross-sections of 46Sc and 51Cr radioisotopes have been obtained from experimental data assuming two different density values (4.50 and 4.54 g/cm3)
The calculations indicate a slight variation of the overall cross sections relative to the slight density differences
Summary
Production cross sections of radioisotopes are important for their applications in nuclear medicine, astrophysical studies and many other fields. From the popular cross section equation Eq (1) [1], several parameters and quantities such as the beam intensity, atomic density, target thickness, atomic decay data, etc. Are involved during calculation of the cross sections. Small variation of one quantity or parameter could lead to an effect on the overall cross sections. Density is one of the important parameters useful in the calculation of cross sections. Following the availability of many works in the literature, researchers sometimes find several values of the atomic densities on same element. Each of these values when used in Eq (1), would give a particular value of cross sections. A simple online search of density of titanium will yield several literature values such as 4.5 g/cm3 [2], 4.51 g/cm3 [3,4] and 4.54 g/cm3 [5]
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