Agent Name

Cobalt-60

CAS Number

10198-40-0

Formula

Co

Major Category

Physical/Radiation

Synonyms

See "Cobalt" CAS # 7440-48-4;

Category

Radionuclides

Description

Silver-white metal;

Sources/Uses

Cobalt-59 is the naturally occurring stable form of cobalt. Of the 9 major radioactive isotopes, only Co-57 and Co-60 have half-lives longer than 80 days. Cobalt-60 is formed by neutron activation in nuclear reactors and particle accelerators. [Argonne] Co-60 is used in medicine for instrument sterilization and radiation therapy for cancer; Used in industrial radiography and irradiation of food and grain; [Waltar, Appendix A-D]

Comments

Source: Neutron activation of stable Co-59; Half-Life: 5.3 years Effective Half-Life: 10 days Specific Activity: 1,100 Ci/g Decay Mode: Beta GI Absorption: 5-30% Lung Clearance Half-Time: >100 days for oxides, hydroxides, halides, and nitrates; 10-100 days for other compounds; Critical Organ: Total body Internal Toxicity: High Annual Limit on Intake: 0.030 mCi Tenth-Value Layer: 34.8 mm Pb Gamma Ray Constant: 13.2 R/h @ 1 cm per mCi Radiation Energy (MeV): Beta 0.313 (99.8%); Gamma 1.17 (99.8%); Gamma 1.33 (100%) Radiation Accidents: 31 accidents reported with 211 injuries and 30 deaths plus C0-60 was involved in 16 incidents of "Melting of Radioactive Materials"; [See Glossary for references.] See "Radiation, ionizing."

Reference Link

Cobalt | Radiation Protection | US EPA

Exposure Assessment
BEI

Cobalt in urine = 15 ug/L; sample at end of shift at end of workweek;

Links to Other NLM Databases
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