Agent Name

Carbon-14

CAS Number

14762-75-5

Formula

C4

Major Category

Physical/Radiation

Category

Radionuclides

Description

Black solid;

Sources/Uses

Naturally occurring in the earth's atmosphere (transmutation of nitrogen by cosmic rays) and produced by reactor irradiation of calcium nitrate; Used in geology and archeology for carbon dating; [Hawley] Also used in thickness gauges for thin coatings and in medicine as a biochemical tracer (detect breast cancer and study drug metabolism); [Waltar]

Comments

Half-Life: 5730 years Effective Half-Life: 12 days Specific Activity: 4.5 Ci/g Decay Mode: Beta Critical Organ: Total body Internal Toxicity: Moderate Annual Limit on Intake: 2 mCi Radiation Energy (MeV): Beta 0.1561 (100%) [See Glossary for references.] See "Radiation, ionizing."

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