Organ dose

Organ (equivalent) dose in connection with other “dose” terms. See dose equivalent for details .

The organ dose or organ dose equivalent (English: organ dose or organ equivalent dose ) is a term from the Radiation Protection and Dosimetry . It is defined as the absorbed dose absorbed by ionizing radiation in a specific organ , tissue or part of the body , measured in gray (Gy), multiplied by the radiation weighting factor of the relevant type of radiation. Your unit is the Sievert (Sv).

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

The determination of the organ dose is used to determine the radiation exposure of people through radiation accidents and medical examinations ; it is also required in the planning of nuclear medicine therapy and radiation therapy ( focal dose ).

The organ dose is an equivalent dose , ie it takes into account the different effects of different types of ionizing radiation on human tissue through the radiation weighting factors .

However, the radiation sensitivity of the individual organs is not taken into account. To do this, the organ doses have to be multiplied by tissue weighting factors and added up to obtain the effective dose for the entire body. The effective dose also takes into account the radiation sensitivity of the individual organs, which z. B. is higher in bone marrow than in skin.

If radionuclides are absorbed into the body, the absorbed dose is accumulated in the organ or tissue over the corresponding period of time. This is expressed by the consequent organ dose, which integrates the organ dose rate over time.

calculation

The organ dose H _{T, R} is the product of the mean absorbed dose D _{T, R} caused by a type of radiation R and absorbed in an organ, tissue or body part T and the radiation weighting factor w _R :

${\displaystyle H_{T,R}=w_{R}\cdot D_{T,R}}$

If the radiation consists of different types and energies of radiation with different values ​​for w _R , then the individual contributions are added. The following then applies to the organ dose H _T :

${\displaystyle H_{T}=\sum _{R}w_{R}\cdot D_{T,R}}$

Web links

• Text of the Radiation Protection Ordinance (Germany)
• The "Radiation Protection Glossary" from Forschungszentrum Jülich (Safety and Radiation Protection) with a focus on operational radiation protection and the basic concepts of dosimetry .
• The Radiation Protection Glossary of the Federal Office for Radiation Protection (BfS) ( Memento dated May 2, 2012 in the Internet Archive ) contains terms from various scientific disciplines and from nuclear technology, including final disposal and abbreviations.

Remarks

1. ↑ The word “organ equivalent dose” has been used in the German Radiation Protection Act since June 2017; previously the term “organ dose” was mentioned.

This article is about a health issue. It is not used for self-diagnosis and does not replace a diagnosis by a doctor. Please note the information on health issues !