Equivalent dose
Equivalent dose
The Equivalent dose (pronunciation: ih-kwuh-vuh-luhnt dohs) is a measure of the biological effect of radiation on human tissue. It is calculated from the absorbed dose and a radiation weighting factor that accounts for the effectiveness of the radiation.
Etymology
The term "Equivalent dose" is derived from the concept of 'equivalence' in radiation exposure. The term was first used in the field of radiology in the mid-20th century.
Definition
The Equivalent dose, denoted by H, is defined as the product of the absorbed dose D, the radiation weighting factor wR, and the tissue weighting factor wT. The unit of equivalent dose is the sievert (Sv).
H = D * wR * wT
Radiation weighting factor
The Radiation weighting factor is a dimensionless factor used to determine the equivalent dose from the absorbed dose. It accounts for the different biological effectiveness of different types of radiation.
Tissue weighting factor
The Tissue weighting factor is a factor that represents the proportion of the risk of stochastic effects resulting from irradiation of the tissue or organ. It is used in the calculation of the effective dose.
Related terms
- Absorbed dose: The amount of energy deposited by ionizing radiation in a unit mass of tissue.
- Effective dose: A measure of the overall risk of health effects from radiation.
- Sievert: The SI unit of equivalent dose, effective dose, and operational dose quantities.
See also
External links
- Medical encyclopedia article on Equivalent dose
- Wikipedia's article - Equivalent dose
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