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Hepatic neoplasms from internally deposited 144CeCl3
F F Hahn1, B A Muggenburg, B B Boecker
1Inhalation Toxicology Research Institute, Albuquerque, New Mexico 87185, USA.
Toxicologic Pathology
|May 1, 1996
Summary
Exposure to the beta-emitting radionuclide 144CeCl3 led to significant liver radiation doses in dogs. This resulted in a high incidence of liver tumors, indicating the liver is a critical target organ for 144Ce effects.
Area of Science:
- Radiation toxicology
- Internal dosimetry
- Carcinogenesis
Background:
- 144Cerium chloride (144CeCl3) is a soluble beta-emitting radionuclide.
- Internal deposition of radionuclides can lead to significant organ doses and long-term health effects.
- Understanding the distribution and effects of internally deposited radionuclides is crucial for risk assessment.
Purpose of the Study:
- To investigate the biological effects of inhaled 144CeCl3 in dogs.
- To determine the dose-response relationship for liver tumor induction following 144CeCl3 exposure.
- To identify the primary target organs for radiation damage from internally deposited 144Ce.
Main Methods:
- Fifty-five dogs were exposed via inhalation to graded activity levels of 144CeCl3.
- Radiation doses to the respiratory tract, liver, and skeleton were assessed.
- Neoplasms in exposed dogs were identified and characterized histopathologically.
Main Results:
- 144Ce translocated from the lungs to the liver and skeleton, with the liver receiving the highest cumulative absorbed dose.
- Liver tumors, including hemangiosarcomas, cholangiocarcinoma, and hepatocellular carcinoma, were the most frequent neoplasms.
- The median liver dose was 57 Gy, with malignant tumors being primary causes of death.
Conclusions:
- The liver is a significant target organ for the effects of internally deposited 144Ce.
- Inhaled 144CeCl3 can induce a high incidence of liver tumors in dogs.
- The findings have implications for understanding the risks associated with internal radionuclide contamination.