cobalt-60

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Related to Co-60: Cs-137, Sr-90

cobalt-60

[′kō‚bȯlt ′siks·tē]
(nuclear physics)
A radioisotope of cobalt, symbol 60Co, having a mass number of 60; emits gamma rays and has many medical and industrial uses; the most commonly used isotope for encapsulated radiation sources.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The summary of the data in Table 1 is important since it gives an overview of the types of applied radiation techniques a significant part of the studied population, for example, (6/23 patients were) was treated in a 2D conformal technique with a Co-60 (Cobalt 60) teletherapy on a Co-60 unit in a 2D mode The majority of patients (16/23) was were treated with a linear accelerator in a 3D mode (conformal technique) and only one patient (1/23) underwent IMRT (3D mode-linear accelerator).
As Co-60 decays, this decrease in activity requires periodic replacement of the sources used and is one of the reasons why cobalt machines have been partly replaced by linear accelerators in modern radiation therapy.
Silver nitrate solutions at different concentrations of 1.0; 2,5; 5.0; and 10 mM dissolved in 1% chitosan solution were stored in glass bottles and irradiated at different doses from 8 to 28 kGy using [gamma]-rays from a Co-60 source (Gamma Chamber 5000, BRIT, India) with a dose rate of 3kGy/h.
Among all [gamma] emitting nuclides, Co-60 has the highest activity in the irradiated graphite sphere.
In the present study, AuNPs were synthesized by gamma Co-60 ray irradiation method using dextran as stabilizer and hydroxyl radical ([sup.*]OH) scavenger.
"Following an initial survey no significant contamination was found, however there were trace amounts of Co-60 which has resulted in a warning letter from Natural Resources Wales.
The Trabzon Governor's Office says there is no record showing that the Cs-137 equipment was ever given to the hospital, although there is a record of the Co-60 device.
The total exposure dose rate of reference organisms resulting from ionising radiation of technogenic radionuclides in Lake Druksiai Insect larvae H-3, Pu-239 <1% Cs-137 40% Cs-134 1% C-14 2% Mn-54 4% Co-60 42% Sr-90 10% Vascular plant H-3, Pu-239 <1% Cs-137 40% Cs-134 1% C-14 2% Mn-54 4% Co-60 43% Sr-90 9% Crustacean H-3, Pu-239 <1% Cs-137 40% Cs-134 1% C-14 3% Mn-54 4% Co-60 41% Sr-90 1% Gastropod H-3, Pu-239 <1% Cs-137 38% Cs-134 1% C-14 4% Mn-54 4% Co-60 46% Sr-90 6% Note: Table made from pie chart.
In the article concerning biological effects of ionizing radiation, (2) the expected mortality in Co-60 contaminated apartments in Taiwan was 116 per 100,000 person-years, not 116 per 1,000 person-years as stated on p 46.