potassium-40


Also found in: Medical.

potassium-40

[pə′tas·ē·əm ¦fȯr·dē]
(nuclear physics)
A radioactive isotope of potassium having a mass number of 40, a half-life of approximately 1.31 × 109 years, and an atomic abundance of 0.000122 gram per gram of potassium.
References in periodicals archive ?
Naturally occurring radionuclides, such as potassium-40, polonium-210, thorium-232 and uranium-238 can be present in food and drinking water in measureable quantities.
Polonium-210 and potassium-40 are naturally occurring radioisotopes in the ocean, for example.
MEASUREMENTS: FFM, ASMM, FM, and percentage fat mass by whole-body dual-energy x-ray absorptiometry; TBK, BCM, and TBK/FFM ratio by whole body potassium-40 counter.
3 bq of cesium-137, they also had an average of 347 bq of naturally occurring potassium-40.
This technique is also used with other radioisotopes, including potassium-40 and uranium-235.
Stevenson points out that all the geoneutrino detectors proposed share a shortcoming: They can't detect the geoneutrinos coming from radioactive potassium-40.
We also have some potassium-40 in our bones and organs--half-life 1,300 million years.
29: The isotopes potassium-40 and argon-40 are particularly important together in which scientific technique?
Within the salt crystals the team found traces of xenon-129, an isotope most commonly formed by the radioactive decay of iodine-129, and argon-40, a decay product of potassium-40.
For that far back, you need to measure the decay of such things as Uranium-235 or Potassium-40.
01) in potassium-40 in muscle by location, but regression analysis showed no significant difference by BC score.
Emissions of potassium-40, a radioactive form of the element occurring naturally in the body in tiny amounts, measure mostly muscle mass, because at least 70 percent of body potassium is in the muscle, says Ellis.

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