Equivalent dose

The organ dose (English: equivalent dose) is a term used in radiation protection and dosimetry. It is defined as the recorded into a specific organ, tissue or body part by means of ionizing radiation absorbed dose measured in gray (Gy ), multiplied by the weighting factor of the radiation concerned radiation type. Your unit is the sievert ( Sv).

The organ dose rate is the absorbed organ dose per unit of time.

The determination of the organ dose used to determine the radiation exposure of humans by radiation accidents or through medical examinations, it is also in the planning of nuclear medicine and radiation therapy required (tumor dose ).

The organ dose is a dose equivalent, that is, into account by the radiation weighting factors, the different effects of different types of ionizing radiation on human tissue.

Not included, however, the radiation sensitivity of individual organs is. Therefore one must multiply the organ doses each with tissue weighting factors and summing up, we obtain the effective dose for the whole body. The effective dose taken into account by the radiation sensitivity of the various institutions, for example, is higher in bone marrow than in skin.

If radionuclides taken into the body, the absorbed dose is accumulated over the corresponding period in the organ or tissue. The result is expressed by the body dose that integrates the body dose rate over time.

Calculation

The organ dose HT, R is caused by the product of the mean one type of radiation R and absorbed in an organ, tissue or body part T absorbed dose DT, R and the radiation weighting factor wR:

If the radiation of different radiation types and energies having different values ​​of wR, then the individual posts are added. Then apply to the organ dose HT: