International Journal of Sciences: Basic and Applied Research (IJSBAR) ISSN 2307-4531 (Print & Online) http://gssrr.org/index.php?journal=JournalOfBasicAndApplied --------------------------------------------------------------------------------------------------------------------------- 139 Photon Flux to Dose Rate Conversion Factors from Photon Exposure for Lung and Soft Tissues Olaseni Bello a* , Wan-Mohammed Wan-Hassan b , Norehan Nor c a,b,c Physics Department, Universiti Technologi Malaysia, UTM, 81310, Johor, Malaysia. a Physics Department, Nigeria Police Academy, Wudil, 71310, Kano, Nigeria. a Email: olaseni@graduate.utm.my b Email: wmsaridan@utm.my c Email: norehan@utm.my Abstract The photon flux to dose conversion factor for the lung and the soft tissues from an idealized photon exposure at 1m AP was achieved using MCNPX ® . The lung and the soft tissues of the modified Adult Male ® phantom of ORNL were subjected to dose function modification, DE and DF. The estimated DF(E) for the energy range 0.1MeV to 15MeV compare favorably with the values of ANSI/ANS-6.1.1-1977. Keywords: Photon Flux; Dose Rate; Conversion Factor; MCNPX; Tissue; Radiation Dose. 1. Introduction The American Nuclear Society, ANS published the American National Standards Institute, ANSI standard on flux to dose factor, DF(E) in 1991 as a revision of the 1977 version. The 1991 version was however withdrawn in 2001[1,2], hence, making the 1977 version a relevant and reliable source for validating estimated DF(E) factors. There are however, reported values of a conversion factor before the ANS 1991 values [3]. Reference [1] made effort to update the equations similar to the ANSI/ANS -6.1.1-1991 by fitting the ICRP 116 dose coefficient to polynomial functions. ------------------------------------------------------------------------ * Corresponding author.