radon-222


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radon-222

a radioactive decay product of radium-226 that has been used to fill permanent implants in tumors. It is being replaced by the more manageable radionuclide iodine-125.
References in periodicals archive ?
2004, Effects of heating on the emanation rates of radon-222 from a suite of natural minerals.
Concentrations of radon-222 were dichotomized as "<300 pCi/L" and "[greater than or equal to]300 pCi/L," the latter being the limit proposed by the Environmental Protection Agency for public water supplies.
Radon is a radioactive gas existing in the natural state and its main isotope is radon-222 which has a half-life of 3.
1974: Radon-222 from the island of Hawaii: Deep soils ate more important than lava fields or volcanoes.
While the uranium and radium in fluorosilicic acid are known carcinogens, two decay products of uranium are even more carcinogenic: radon-222 and polonium-210.
In 1991, the EPA proposed a 300-pCi/L (11 Bq/L) maximum contaminant level (MCL) for radon-222 in community water supplies and all nontransient, noncommunity public water systems.
Radon-222 is found virtually everywhere because its predecessors - radium-226 and uranium-238 - are in soil and rocks everywhere.
These observations represented a sequence of decays in a single nucleus, going from radon-222 to polonium-218 to lead-214 to bismuth-214 to polonium-214.
ISO 11665-9:2016, Measurement of radioactivity in the environment Air: radon-222 Part 9: Test methods for exhalation rate of building materials, specifies a method for the determination of the exhalation rate of radon from building materials.
Radon-222 concentrations in the United States--results of sample surveys in five states.
1 Bq/L for (228) Ra; 1 Bq/L for (223-226) Ra) (234) U, and (235) U; 10 Bq/L for (238) U; 100Bq/L for radon-222 ((222) Rn), and 15 [micro]g/L for total uranium (WHO 2004).
Uno de estos trazadores, utilizado recientemente, es el radon-222, llamado comunmente radon.