title: Effects of computational phantoms on the effective dose and two-dosimeter algorithm for external photon beams.
abstract: In this study, the effect of computational phantoms on the effective dose (E), dosimeter responses positioned on the front (chest) and back of phantom, and two-dosimeter algorithm was investigated for external photon beams. This study was performed using Korean Typical MAN-2 (KTMAN-2), Chinese Reference Adult Male (CRAM), ICRP male reference, and Male Adult meSH (MASH) reference phantoms. Calculations were performed for beam directions in different polar and azimuthal angles using the Monte Carlo code of MCNP at energies of 0.08, 0.3, and 1MeV. Results show that the body shape significantly affects E and two-dosimeter responses when the dosimeters are indirectly irradiated. The acquired two-dosimeter algorithms are almost the same for all the mentioned phantoms except for KTMAN-2. Comparisons between the obtained E and estimated E (Eest), acquired from two-dosimeter algorithm, illustrate that the Eest is overestimated in overhead (OH) and underfoot (UF) directions. The effect of using one algorithm for all phantoms was also investigated. Results show that application of one algorithm to all reference phantoms is possible.
authors.affiliation: Ferdowsi University of Mashhad, Physics Department, School of Sciences, Mashhad, Iran.
authors.forename: K
authors.initials: K
authors.lastname: Karimi-Shahri
authors.affiliation: Ferdowsi University of Mashhad, Physics Department, School of Sciences, Mashhad, Iran. Electronic address: rafat@ferdowsi.um.ac.ir.
authors.forename: L
authors.initials: L
authors.lastname: Rafat-Motavalli
authors.affiliation: Ferdowsi University of Mashhad, Physics Department, School of Sciences, Mashhad, Iran.
authors.forename: H
authors.initials: H
authors.lastname: Miri-Hakimabad
authors.affiliation: China Institute for Radiation Protection, PO 120, Taiyuan 030006, People's Republic of China.
authors.forename: L
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Engineering Physics, Tsinghua University, 100084 Beijing, People's Republic of China.
authors.forename: J
authors.initials: J
authors.lastname: Li
mesh_terms: D000328:Adult; D000465:Algorithms; D006801:Humans; D008297:Male; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D017785:Photons; D011829:Radiation Dosage; D000072232:Radiation Dosimeters; D011874:Radiometry; D012016:Reference Values
keywords: Effective dose; Male reference voxel phantom; Monte Carlo code; Two-dosimeter algorithm