radioactive calcium

radioactive calcium

Any of the radionuclides of calcium, the most common of which are the beta-emitting 45Ca, which has a half-life of 163 days, and the beta and gamma-emitting 47Ca, which has a half-life of 4.5 days and has some currency as a tracer for calcium metabolism studies.
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The intestinal absorption and excretion of radioactive calcium and phosphorus.
Evidence including the uptake of radioactive calcium in skeletons of female egg-laying Zebra Finches (Taeniopygia guttata) (Reynolds 1997), and differences in total body calcium in postlaying versus pre-laying and laying female House Sparrows (Passer domesticus) (Krementz and Ankney 1995) suggest the presence of medullary bone.
While radioactive and non radioactive calcium isotopes were employed to study the active transport and passive transport of calcium, transport of labelled mannitol was taken as a measure of passive permeability.
In the rush to develop "peaceful uses of the atom" in the years following testing of the H-bomb, much interesting work was done with radioactive calcium isotopes ([sup.
At Columbia University and Montefiore Hospital in New York City, twelve terminally ill cancer patients were injected, in the late 1950s, with concentrations of radioactive calcium and strontium-85 in an attempt to measure the rate at which radioactive substances were absorbed into various human tissues.