Agent Name

Krypton-85

CAS Number

13983-27-2

Formula

Kr

Major Category

Physical/Radiation

Category

Radionuclides

Description

A gas that is heavier than air, colorless, and odorless; [Argonne]

Sources/Uses

Krypton is present in minute amounts in the atmosphere with 6 stable isotopes including Kr-84 comprising 57% of natural krypton; Of the radionuclides produced during fission of uranium and plutonium, Kr-81 and Kr-85 have long enough half-lives to persist in the environment; Used to detect leaks and to excite phosphors to emit light; [Argonne]

Comments

Source: Fission of uranium and plutonium Half-Life: 11 years Specific Activity: 400 Ci/g Decay Mode: Beta Critical Organ: Skin Tenth-Value Layer: 2.8 mm Pb Gamma Ray Constant; 0.4 R/h @ 1 cm per mCi Average Radiation Energy (MeV): Beta 0.25; Gamma 0.0022 [Argonne] [See Glossary for references.] See "Radiation, ionizing."

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