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  • Title: Radium retention in mature beagles injected at 5 years of age.
    Author: Lloyd RD, Bruenger FW, Jones CW, Taylor GN, Mays CW.
    Journal: Radiat Res; 1983 Apr; 94(1):210-6. PubMed ID: 6856767.
    Abstract:
    Retention of 226Ra was substantially lower in mature beagles injected at 5 years of age compared to corresponding values for young adult beagles injected at 17 months of age. As with young adults, the percentage retention in mature dogs given about 10 microCi/kg exceeded that in mature dogs given 4 microCi/kg or less. Percentage retention, R, at t days after the injection of 10 microCi/kg in mature beagles could be represented by the equation, R = 64.1e-0.233t + 13.0e-0.0048lt + 22.9e-0.000329t, and for mature beagles given 4 microCi/kg or less, R = 38.8e-0.40t + 30.6e-0.0424t + 11.9e-0.00567t + 18.7e-0.000352t. Measured 222Rn/226Ra ratios in bone were similar in mature and young adults. Roughly 66% of the injected radium was excreted by mature dogs during the first 3 weeks, about two-thirds of the total excretion appearing in the feces. Distribution of 226Ra within the skeleton was similar in mature and young adult beagles.
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