Development and comparison of computational models for estimation of absorbed organ radiation dose in rainbow trout (Oncorhynchus mykiss) from uptake of iodine-131

Application of computational models to estimate organ radiation dose in rainbow trout from uptake of molybdenum-99 with comparison to iodine-131

“…A few studies have compared the variation between different phantom types (Padilla et al, 2008;Xie et al, 2010;Mohammadi et al, 2011Mohammadi et al, , 2012Mauxion et al, 2013;Martinez et al, 2014b) with generally consistent results for whole body, but varying results for organ doses. The variation between organ doses in stylized vs voxel/hybrid models has been attributed to variation in organ shape, location, and orientation.…”

“…Blanks and standards (BBOT and sulfanilamide) were each run in triplicate every 18 samples to ensure consistent calibration. Martinez et al (2014b) discuss computational model development in detail, and we will only discuss the development of the first two model types briefly. In the stylized phantom, the shape, size, and location of the geometries selected for organ representation were determined through knowledge of fish anatomy, organism dissection, and CT image analysis.…”

Voxel modeling of rabbits for use in radiological dose rate calculations

“…As we consider smaller and smaller organisms, this assumption becomes less robust. At the lowest electron energies, total absorption in the source tissue is reasonable, but for high energy electrons, it becomes increasingly relevant to consider electron energy deposited in adjacent organs (see Martinez et al, 2014;G omez-Ros et al, 2008). Assuming similar tissue densities, the maximum energy deposition is heavily dependent on target size.…”

“…Stabin et al, 2006;Kinase, 2008), only one has specifically examined the effect of size. Martinez et al (2014) examined size effects in a freshwater organism, the rainbow trout, using ellipsoidal, stylized, and voxelized organism geometries. To explore this size effect for mammals for internal electron sources, a range of testis masses (adult rabbit), and ovary masses (juvenile rabbit) were entered into the rabbit models to represent various lifestages.…”

“…The first is the stylized model. In stylized models, pertinent organs are included as ellipsoids (see Martinez et al, 2014 for an example of a stylized model). This has the advantage of allowing researchers to calculate dose to sensitive organs, while still maintaining much of the simplicity of using ellipsoidal models.…”