| Popis: |
The concentration of radium in the blood of radium cases at long times after exposure provides a sensitive test of models of long-term retention. The modified power function retention model predicts that the radium-to-calcium ratio in the body will be the order of 100 times that in the serum at times greater than 20 years after exposure. The radium content of whole blood, blood serum, blood cells, urine, feces, and body of four New Jersey radium cases has been determined 40 years after exposure. The ratio of Ra/Ca in the body to that in the blood in these four cases averaged about 100, with a range of about a factor of 5. The average rate of excretory plasma or serum clearance for these four cases was about 80 liters/day and the coefficient of radium excretion was 2.5 ± 0.9%/year. |
