Thorium-232 (232 Th) is the main naturally occurring isotope of thorium, with a relative abundance of 99.98%. It has a half life of 14.05 billion years, which makes it the longest-lived isotope of thorium. It decays by alpha decay to radium-228; its decay chain terminates at stable lead-208.

Thorium-232 is the only primordial isotope of thorium and effectively makes up all natural thorium; other thorium isotopes occur only in traces as relatively short-lived decay products of uranium and thorium.

Mar 25, 2021 · Thorium-232. Atomic No. Radionuclide Class Table 1 Occupational Values Table 2 Effluent Concentrations Table 3 Releases to Sewers; Col. 1 Col. 2 Col. 3 Col. 1 Col. 2; Oral Ingestion ALI (µCi) Inhalation Air (µCi/ml) Water (µCi/ml) Monthly Average Concentration (µCi/ml) ALI (µCi) DAC (µCi/ml) 90: Thorium-232: W, see 226 Th: 7E-1 Bone Surf ...

Thorium-232 is a naturally occurring radionuclide that is found in the earth’s crust. It is considered a “primordial radionuclide” since it has survived since the origin of the earth. IS THORIUM-232 HAZARDOUS? The main pathways of exposure are ingestion and inhalation.

Thorium is a naturally occurring radioactive metal that is found at low levels in soil, rocks, water, plants, and animals. Almost all naturally occurring thorium exists in the form of either radioactive isotope thorium-232, thorium-230, and thorium-228. There are more than 10 other thorium isotopes that can be artificially produced.

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Feb 6, 2025 · There are natural and man-made forms of thorium, all of which are radioactive. In general, naturally occurring thorium exists as Th-232, Th-230 or Th-228. Natural thorium is present in trace quantities in virtually all rock, soil, water, plants and animals.

Thorium-232 (Th-232) is a naturally occurring radioactive isotope of thorium and the most stable and abundant isotope of this element. It has an extremely long half-life of approximately 14 billion years, making it nearly as old as the Earth itself.

Twenty-seven thorium radioisotopes have been characterized, with a range in atomic weight from 210 to 236. All are unstable with the most stable being 232 Th with a half-life of 14.05 billion years. Thorium-232 represents all but a trace of naturally occurring thorium.

Thorium-232 is a naturally occurring radionuclide that is found in the earth’s crust. It is considered a “primordial radionuclide” since it has survived since the origin of the earth. IS THORIUM-232 HAZARDOUS?