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Absorbed Fractions for -Particles in Tissues of Trabecular Bone: Considerations of Marrow Cellularity Within the ICRP Reference Male

¹ Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, Florida
² Department of Physics and Astronomy, Francis Marion University, Florence, South Carolina
³ Department of Health Physics, University of Nevada–Las Vegas, Las Vegas, Nevada
⁴ Department of Neurosurgery, University of Florida, Gainesville, Florida
⁵ Department of Radiology, Johns Hopkins University, Baltimore, Maryland
⁶ Department of Biomedical Engineering, University of Florida, Gainesville, Florida

View larger version (106K): [in a new window]   FIGURE 1. Histology slides of normal human bone marrow at 2 different marrow cellularities. At lower cellularity, a greater proportion of bone trabecula surface is covered by adipocytes (i.e., the first fat layer).

View larger version (55K): [in a new window]   FIGURE 2. Geometric model used to partition sampled marrow cavity chords into subtrajectories of -particle through active (red) marrow and inactive (yellow) marrow, the latter represented by individual adipocytes (white spheres).

View larger version (29K): [in a new window]   FIGURE 3. Absorbed fractions for an active marrow target (100% cellularity) from active marrow source (TAM) (A), trabecular bone endosteum source (TBE) (B), trabecular bone surface source (TBS) (C), and trabecular bone volume source (TBV) (D).

View larger version (29K): [in a new window]   FIGURE 4. Absorbed fractions for endosteum target from -sources emitted within the TAM (A), TBE (B), TBS (C), and TBV (D).

View larger version (35K): [in a new window]   FIGURE 5. Dependence of active marrow absorbed fraction with changes in marrow cellularity within lumbar vertebrae: TAM source (A), TBE source (B), TBS source (C), and TBV source (D).