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The equivalent dose (HT) is a measure of the radiation dose to tissue where an attempt has been made to allow for the different relative biological effect of different types of ionizing radiation. Equivalent dose is therefore a less fundamental quantity than radiation absorbed dose, but is more biologically significant. Equivalent dose has units of sieverts. Another unit, Röntgen equivalent man (REM or rem), is still in common use in the US, although regulatory and advisory bodies are encouraging transition to sieverts (1 REM = 1/100 sievert.) 
Additional recommended knowledge
Equivalent dose (HT) is calculated by multiplying the absorbed dose to the organ or tissue (DT) with the radiation weighting factor, wR. This factor is selected for the type and energy of the radiation incident on the body, or in the case of sources within the body, emitted by the source. The value of wR is 1 for x-rays, gamma rays and beta particles, but higher for protons, neutrons, alpha particles etc.
Where HT,R = equivalent dose to tissue T from radiation R
DT,R = absorbed dose D (in grays) to tissue T from radiation R
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Equivalent_dose". A list of authors is available in Wikipedia.|