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Untitled1_25 - decay The unit used to measure radioactivity...

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Radiological Emergency Management Independent Study Course 1-8 Exposure Rate Usually Expressed “Per Hour” Standard international (SI) units which may be used in place of the rem and the rad are the sievert (Sv) and the gray (Gy). These units are related as follows: O 1 Sv = 100 rem. O 1 Gy = 100 rad. SI units must be used on transportation labels. Many radiation meters in use utilize R/hr for measuring dose rate. To convert R/hr to Sv/hr divide by 100. (For example: 60 R/hr ÷ 100 = .6 Sv/hr.) Radioactivity Measurement Terms The radioactivity of a given material is a measure of the rate at which the material undergoes radioactive
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Unformatted text preview: decay. The unit used to measure radioactivity is the curie (Ci) where one curie equals 3.7 x 10 10 radioactive disintegrations per second (dps). The SI unit which may be used in place of the curie is the becquerel (Bq). These units are related as follows: O 1 Ci = 3.7 x 10 10 dps = 3.7 x 10 10 Bq. O 1 Bq = 1 dps . Another useful quantity is the amount of radioactivity per unit mass. This quantity, called specific activity , is typically measured in units of curies per gram (Ci/g)....
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