Agent Name

Technetium

CAS Number

7440-26-8

Formula

Tc

Major Category

Physical/Radiation

Category

Radionuclides

Description

Silver-gray metal; [Argonne]

Sources/Uses

Technetium is the first man-made element, produced in 1937 by deuteron bombardment of molybdenum. All isotopes are radioactive. Six atoms of technetium are created for every 100 fissions of uranium. Technetium is a waste product in spent nuclear fuel. Of the ten major isotopes, Tc-99 is the one of most concern as an environmental contaminant. The half-life of Tc-99 is 210,000 years. Used in steel as a corrosion inhibitor, but this use is limited by the radioactivity of technetium; Tc-99m is used in nuclear medicine; [Argonne]

Comments

Most Important Radionuclide: Tc-99m Source: Decay of molybdenum-99 Half-Life: 6 hours Decay Mode: Isomeric Transition (gamma) Decay GI Absorption: 50-80% of technetium pertechnetate (TcO4) Lung Clearance Half-Time: Weeks for oxides, hydroxides, halides, and nitrates; Days for all other compounds; Critical Organ: Total body Internal Toxicity: Low Annual Limit on Intake: 80 mCi Gamma Ray Constant: 0.6 R/h @ 1 cm per mCi Tenth-Value Layer: 0.9 mm Pb Radiation Energy (MeV): Gamma 0.141 (88%) [See Glossary for references.] See "Radiation, ionizing."

Reference Link

Technetium-99 | Radiation Protection | US EPA

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