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Units of Radiation Measure

To comply with DOE  [http://www.ornl.gov/Env_Rpt/aser95/ac.htm#DOE] orders, this report will present results using the current system followed by Systegrave;me International (SI) units in parentheses. For example, the dose from a typical chest X ray is 10 mrem (0.10 mSv).

Current System

SI System

Conversion

Activity

 

 

curie (Ci)

becquerel (Bq)

1 CI = 3.7 x 1010Bq

Absorbed dose

 

 

rad (radiation absorbed dose)

gray (Gy)

1 rad = 0.01 Gy

Dose equivalent

 

 

rem (roentgen equivalent man)

sievert (Sv)

1 rem = 0.01 Sv

Converting Dose Equivalent

Because a rem represents a fairly large dose of radiation, dose is best expressed as a millirem, or 1/1000 of a rem. The same is true of sieverts. Dose is expressed in millisieverts (mSv). Because 1 mrem equals 0.01 mSv, converting from millirem to millisieverts is simply a matter of moving the decimal point two places to the left. For example, 267 mrem equals 2.67 mSv.

 http://www.ornl.gov/Env_Rpt/aser95/appa-sb2.htm

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Last modified: 01/16/09