Evaluated cross section libraries and kerma factors for neutrons up to 100 MeV on {sup 40}Ca and {sup 31}P

Abstract

We present evaluations of the interaction of 20 to 100 MeV neutrons with calcium and phosphorus, which follows on from our previous work on carbon, nitrogen, and oxygen [l, 21. Our aim is to accurately represent integrated cross sections, inclusive emission spectra, and kerma factors, in a data library which can be used in radiation transport calculations. We apply the GNASH nuclear model code, which includes Hauser-Feshbach, preequilibrium, and direct reaction mechanisms, and use experimental measurements to optimize the calculations. Total, elastic, and nonelastic cross sections, angle-energy correlated emission spectra for light ejectiles with A 5 4 and gamma-rays, and average energy depositions, are determined. The expected accuracy of the calculated cross sections and kerma factors is discussed.

Dosimetry for ion beam radiotherapy

“…In the case of protons for example, this accounts for a minor part of the difference in the w air -value used in IAEA TRS-398 and ICRU Report 59 (the major part being due to a difference in analyzing the same data as pointed out by and Andreo et al (2000)). IAEA TRS-398 uses Spencer-Attix (restricted) stopping power ratios calculated by Medin and Andreo (1997) using the Monte Carlo method based on proton stopping powers from ICRU Report 49 and electron stopping powers from ICRU Report 37 (1984) as well as non-elastic nuclear cross section data for secondary proton production by Chadwick and Young (1996). ICRU Report 59 (1998) uses Bragg-Gray (unrestricted) stopping power ratios from ICRU Report 49 (1993).…”