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RT Safety

The document compares units of measurement for activity, specific activity, exposure, absorbed dose, and dose equivalent between the International System of Units (SI) and the obsolete CGS system. It also provides conversion factors between the rad, rem, and sievert units. Radiation intensities per curie are listed for radioactive sources of Iridium-192 and Cobalt-60 at distances of 1 foot and 1 meter. Exposure, absorbed dose, and dose rate are defined in terms of measuring radiation strength, absorbed radiation, and rate of receiving radiation dose.

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39 views1 page

RT Safety

The document compares units of measurement for activity, specific activity, exposure, absorbed dose, and dose equivalent between the International System of Units (SI) and the obsolete CGS system. It also provides conversion factors between the rad, rem, and sievert units. Radiation intensities per curie are listed for radioactive sources of Iridium-192 and Cobalt-60 at distances of 1 foot and 1 meter. Exposure, absorbed dose, and dose rate are defined in terms of measuring radiation strength, absorbed radiation, and rate of receiving radiation dose.

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கோகுல் இரா
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© © All Rights Reserved
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UNIT SI system CGS system

activity Becquerel (Bq) Ci


Specific activity Bq/gm Ci/gm
Exposure Coulomb/kg Roentgen
Absorbed dose Grey(Gy) rad
Dose equivalent Sievert(Sv) rem
Dose rate Sv/hr Rem/hr

100R=1Sv
1R = 10mSv
1mR= 10µSv
Milli=10-3
Micro=10-6
Nano=10-9
Kilo =103
Mega=106
Giga=109

Ir-192 specific gamma constant intensity per Ci at 1feet is 5.9R/h


Ir-192 specific gamma constant intensity per Ci at 1meter is 0.55R/h
Co-60 specific gamma constant intensity per Ci at 1feet is 14.5R/h
Co-60 specific gamma constant intensity per Ci at 1 meter is 1.35R/h
Exposure:  Exposure is a measure of the strength of a radiation field at some point
in air. 
Dose or Absorbed Dose: the dose is the amount of radiation absorbed by and
object. 
Dose Rate: The dose rate is a measure of how fast a radiation dose is being
received. 

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