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Microdistribution of 239Pu in the beagle skeleton
E Polig1, F W Bruenger, R D Lloyd
1Forschungszentrum Karlsruhe, Hauptabteilung Sicherheit/Strahlenschutz, Germany.
Health Physics
|August 29, 1998
Summary
Plutonium-239 (239Pu) distribution in beagle bones shows higher initial uptake and faster clearance in high-turnover bone regions. Over time, plutonium shifts from trabecular to cortical bone surfaces.
Area of Science:
- Radiochemistry
- Skeletal Biology
- Toxicology
Background:
- Understanding the long-term behavior of internally deposited radionuclides like Plutonium-239 (239Pu) is crucial for radiation protection.
- Skeletal tissues, particularly bone surfaces, serve as primary sites for radionuclide deposition and retention.
Purpose of the Study:
- To investigate the microdistribution and kinetic behavior of 239Pu in different skeletal regions of beagles.
- To model the deposition and clearance of 239Pu based on bone turnover rates.
Main Methods:
- Neutron-induced autoradiography was used to analyze 239Pu microdistribution in humerus, lumbar vertebra, and proximal ulna.
- Beagles received a single injection of 239Pu, and serial sacrifice allowed for analysis at multiple time points (4-64 weeks).
- Kinetic modeling was employed to describe surface deposition and clearance rates.
Main Results:
- Bones with higher turnover rates exhibited greater initial 239Pu uptake and faster clearance.
- A trabecular to cortical affinity ratio of approximately 10 was observed, with activity translocating from trabecular to cortical sites over time.
- The affinity ratio of forming to resting bone surfaces was around three, and marrow labeling varied by bone type.
Conclusions:
- Skeletal region-specific turnover rates significantly influence 239Pu deposition and clearance kinetics.
- Plutonium's distribution shifts from trabecular to cortical bone surfaces, with varying marrow labeling patterns observed.