| Conversions Conversion Equivalence | 1 millicurie (mCi) = 37 megabecquerels (MBq) | 1 rad = 0.01 gray (Gy) | 1 rem = 0.01 sievert (Sv) | 1 roentgen (R) = 0.000258 coulomb/kilogram (C/kg) |
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a unit of radioactivity equal to one thousandth of a curie ; 3.70 × 107 disintegrations per second. Abbreviation: mCi, mc.
1 curie = 3.70 x 10^10 disintegrations
1 GBq (27 millicuries) 37 GBq (1 curie)
| Microcurie (μCi) x 1/1000* Millicurie (mCi) | 10 (μCi) = .01 (mCi) | 100 (μCi) = .1 (mCi) | 1000 (μCi) = 1 (mCi) |
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It was originally defined as “the quantity or mass of radium emanation in equilibrium with one gram of radium (element)”, but is currently defined as 1 Ci = 3.7×10 10 decays per second after more accurate measurements of the activity of 226 Ra (which has a specific activity of 3.66×10 10 Bq/g). ...
Adult: 5,000 Millirems . The current federal occupational limit of exposure per year for an adult (the limit for a worker using radiation) is “as low as reasonably achievable; however, not to exceed 5,000 millirems” above the 300+ millirems of natural sources of radiation and any medical radiation.
The units of measurement for radioactivity are the becquerel (Bq, international unit) and the curie (Ci, U.S. unit) . Exposure describes the amount of radiation traveling through the air. Many types of radiation monitors measure exposure.
For example, a chest x-ray typically gives a dose of about 0.01 rem (10 millirem) and a full-body CT gives a dose of 1 rem (1,000 mrem), as shown in the table to the left. Among these medical procedures, x-rays, mammography, and CT use radiation or perform functions similar to those of radioisotopes.
A picocurie (pCi) is a very small amount of radioactivity, and it is associated with about a trillionth of a gram (a picogram) of radium . (There are approximately 28 grams in an ounce.)
As such, 1 Ci is equal to 37 billion (3.7 x 10 10 ) disintegrations
The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T 1 / 2 , and the decay constant is given by T 1 / 2 = 0.693/λ .
As such, 1 Bq represents a rate of radioactive decay equal to 1 disintegration per second , and 37 billion (3.7 x 1010) Bq equals 1 curie (Ci).
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