ABSTRACT
Define the following terms used in radiation protection aspects:
Equivalent dose (HT )
Effective dose (HE )
Committed equivalent dose (HT [50])
Deep dose equivalent (Hp [10])
Shallow dose equivalent (Hp [0.07])
SolutionEquivalent dose (HT ) is a measure of the radiation dose to tissue taking into consideration the different relative biological effects of different types of ionising radiation. The equivalent dose in tissue, T, is given by the expression: https://www.w3.org/1998/Math/MathML"> H T = ∑ W R ⋅ D T , R https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781482240016/f39e5ab3-c2c0-4526-92d8-5e1ff1716456/content/equ10_0001.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
where DT,R = absorbed dose averaged over the tissue or organ T, due to radiation R.
WR = radiation weighting factor due to radiation R
Effective dose (HE ) = sum of the weighted equivalent doses in all the tissues and organs of the body. It is given by the expression: https://www.w3.org/1998/Math/MathML"> H T = ∑ W R ⋅ D T , R https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781482240016/f39e5ab3-c2c0-4526-92d8-5e1ff1716456/content/equ10_0002.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
where:
HT = equivalent dose in tissue or organ T
WT = weighting factor for tissue T
Committed equivalent dose, HT (50), is the time integral of the equivalent dose-rate in a specific tissue, T, following the intake of a radionuclide into the body. Unless specified otherwise, an integration time of 50 years after intake is recommended for the occupational dose and 70 years for the members of the public.
Deep-dose equivalent (Hp [10]) is the dose equivalent at a tissue depth of 1 cm (1000 mg·cm−2) due to external whole-body exposure to ionising radiation.
Shallow-dose equivalent (Hp [0.07]) is the external exposure dose equivalent to the skin or an extremity at a tissue depth of 0.07 mm (7 mg·cm−2) averaged over an area of 1 cm2.
