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Cobalt-60 (60 Co) is a ... 2.8 GBq or 60 μg of 60 Co, generates a dose of 1 mSv at 1 meter away, within an hour. The swallowing of 60 Co reduces the distance to a ...
Cobalt therapy is the medical use of gamma rays from the radioisotope cobalt-60 to treat conditions such as cancer. Beginning in the 1950s, cobalt-60 was widely used in external beam radiotherapy (teletherapy) machines, which produced a beam of gamma rays which was directed into the patient's body to kill tumor tissue.
Cobalt-60 beam machine from 1951 Cobalt units use radiation from cobalt-60, which emits two gamma rays at energies of 1.17 and 1.33 MeV, a dichromatic beam with an average energy of 1.25 MeV. The role of the cobalt unit has largely been replaced by the linear accelerator, which can generate higher energy radiation.
Sample of cobalt-60 that emits 1 μCi (microcurie) of radioactivity; i.e. 37,000 decays per second. The curie (symbol Ci ) is a non- SI unit of radioactivity originally defined in 1910. According to a notice in Nature at the time, it was to be named in honour of Pierre Curie , [ 1 ] but was considered at least by some to be in honour of Marie ...
Cobalt is a chemical element; it has symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, somewhat brittle, gray metal.
Acute radiation syndrome (ARS), also known as radiation sickness or radiation poisoning, is a collection of health effects that are caused by being exposed to high amounts of ionizing radiation in a short period of time. [ 1 ] Symptoms can start within an hour of exposure, and can last for several months. [ 1 ][ 3 ][ 5 ] Early symptoms are ...
According to the 1985 CNSNS report, about four thousand people were exposed to cobalt-60 radiation as a result of the incident. [3] It is estimated that almost 80 percent of people received a dose less than 500 mrem (equivalent to 5 m Sv ); 18 percent, between 0.5 and 25 rems (5–25 mSv); and only two percent (about 80 people) received doses ...
Radiation exposure is a measure of the ionization of air due to ionizing radiation from photons. [1] It is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air. [1] As of 2007, "medical radiation exposure" was defined by the International Commission on Radiological Protection as ...