Related Experiment Video
Updated: Aug 11, 2026
11:40
A Co-culture Method to Investigate the Crosstalk Between X-ray Irradiated Caco-2 Cells and PBMC
Published on: January 30, 2018
Relative biological effectiveness (RBE) of 210Po alpha-particles versus X-rays on lethality in bovine endothelial
P A Thomas1, B L Tracy, T Ping
1Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 5B3.
International Journal of Radiation Biology
|February 6, 2003
Summary
Polonium-210 (210Po) alpha-particles are 7-14 times more effective than X-rays at damaging endothelial cells. This is significant for individuals with high meat and seafood intake, as 210Po can elevate radiation exposure.
Area of Science:
- Radiation biology
- Cellular toxicology
- Environmental health science
Background:
- Polonium-210 (210Po) alpha-radiation significantly elevates background radiation dose in populations consuming caribou and reindeer meat/seafood.
- Ingested 210Po accumulates in blood, targeting endothelial cells lining blood vessels due to alpha-particle proximity.
Purpose of the Study:
- To determine the relative biological effectiveness (RBE) of 210Po alpha-particles compared to 250 kVp X-rays.
- To quantify the injury induced by 210Po alpha-particles in cultured bovine aortic endothelial cells.
Main Methods:
- Cultured bovine aortic endothelial cells were exposed to varying doses of 210Po alpha-particles and X-rays.
- Cellular injury was assessed by measuring cell viability (trypan blue exclusion), live cell count, lactate dehydrogenase (LDH) release, and clonogenic survival.
Main Results:
- The RBE of 210Po alpha-particles ranged from 7 to 14 times that of X-rays across different assays.
- Specific RBE values were 13.1 for cell viability, 10.3 for live cell number, 11.1 for LDH activity, and 14.0 for clonogenic survival (initial slopes).
- A stimulatory effect on cell proliferation was observed at low X-ray doses (<0.25 Gy).
Conclusions:
- 210Po alpha-particles are substantially more effective than X-rays in causing endothelial cell damage.
- These findings highlight the potential health risks associated with 210Po exposure through diet.
- The study quantifies the RBE for alpha-particle-induced endothelial cell injury.
Related Concept Videos
03:23Types of Radioactivity
The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
02:59Biological Effects of Radiation
All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...