Agent Name

Iridium-192

CAS Number

14694-69-0

Formula

Ir

Major Category

Physical/Radiation

Category

Radionuclides

Description

A hard and brittle metal; It is about twice as dense as lead; Some of the salts are highly colored; [Argonne]

Sources/Uses

There are 2 stable isotopes. About 63% is Ir-193 , and 37% is Ir-191. There are 15 major radioisotopes, and only 3 have a half-life greater than 1 month: Ir-192, Ir-192m, and Ir-194m. Natural iridium is obtained from nickel and platinum ores. [Argonne]

Comments

Most Important Radionuclide: Ir-192 Source: Usually produced in nuclear reactors by neutron absorption of Ir-191; Half-Life: 74 days Specific Activity: 9,200 Ci/g Decay Mode: Beta, Electron capture; GI Absorption: 1% Lung Clearance Half-Time: Years for oxides and hydroxides; Weeks for halides, nitrates, and metallic iridium; Days for all other compounds; Internal Toxicity: High Annual Limit on Intake: 0.2 mCi Tenth-Value Layer: 20 mm Pb Gamma Ray Constant: 4.8 R/h @ 1 cm per mCi; Radiation Energy (MeV): Beta 0.67 (49%); Gamma 0.308 (28%); Gamma 0.468 (46%); Radiation Accidents: 27 accidents reported with 51 injuries and 10 deaths plus 1 report of "Meltings of Radioactive Materials"; [See Glossary for references.] See "Radiation, ionizing." See "Iridium."

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