Page 5 - Radiation Safety
P. 5
RADIATION UNIT
ACTIVITY EXPOSURE ABSORBED DOSE EQUIVALENT DOSE EFFECTIVE DOSE
Becquerel Coulomb/kg Gray Sievert Sievert
Curie Roentgen Rad Rem Rem
EQUIVALENT DOSE = ABSORBED DOSE x W R EFFECTIVE DOSE = ABSORBED DOSE x W x W T
R
Radiation Weighing Factor (W ) Tissue Weighing Factor (W )
T
R
Higher the W :
R
1. More harmful to tissue.
2. Higher Linear Energy Transfer
(LET)
3. Lesser the penetrating power
Higher the W :
T
1. More radiosensitivity
2. Higher metabolic rate
3. Higher deviation rate
