Creation of a voxel phantom of the ICRP reference crab.
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2013;
120:14-18. [PMID:
23410593 DOI:
10.1016/j.jenvrad.2013.01.006]
[Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2012] [Revised: 11/12/2012] [Accepted: 01/02/2013] [Indexed: 06/01/2023]
Abstract
The International Commission on Radiological Protection (ICRP) has modeled twelve reference animal and plant (RAP) species using simple geometric shapes in Monte-Carlo (MCNP) based simulations. The focus has now shifted to creating voxel phantoms of each RAP in order to estimate doses to biota with a higher degree of confidence. This paper describes the creation of a voxel model of a Dungeness crab from CT images with shell, gills, gonads, hepatopancreas, and heart identified and segmented. Absorbed fractions were tabulated for each organ as a source and target at twelve photon and nine electron energies: 0.01, 0.015, 0.02, 0.03, 0.05, 0.1, 0.2, 0.5, 1.0, 1.5, 2.0, and 4.0 MeV for photons and 0.1, 0.2, 0.4, 0.5, 0.7, 1.0, 1.5, 2.0 and 4.0 MeV for electrons. AFs whose error exceeded 5% are marked with an underline in the data tables; AFs whose error was higher than 10% were excluded, and are shown in the tabulated data as a dashed line. A representative sample of the data is shown in Figs. 3-8; the entire data set is available as an electronic appendix. The results are consistent with previous small organism studies (Kinase, 2008; Stabin et al., 2006), and suggest that AF values are highly dependent on source organ location and mass.
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