Absorbed Dose

Date: 2015-10-07; view: 433.

Dose

The amount of energy deposited in body tissue due to radiation exposure. Various technical terms - such as dose equivalent, effective dose equivalent, and collective dose - are used to evaluate the amount of radiation received by an exposed individual or population.

One coulomb corresponds to the charge on ion pairs . The average energy required to produce 1 ion pair in air is 33.5 eV. So the energy needed to produce ion pairs is:

Since 1 eV = joules this gives the energy absorbed per kilogram of air for an exposure of as 33.5 joules.

Materials other than air receiving an exposure of will absorb a different amount of energy per gram. Soft tissue of the body for example will absorb 37.2 joules for an exposure of , providing the gamma-ray energy is in the range 200 keV to 3 MeV.

This 37.2 joules per kilogram is called the absorbed dose received by tissue exposed to .