Equivalent dose
Updates to Article Attributes
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 effects of different types of ionizing radiation. In quantitative terms, equivalent dose is less fundamental than absorbed dose, but it is more biologically significant. Equivalent dose has SI units of sieverts but rem (roentgen equivalent in man) is used commonly (1SV = 100REM).
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 dependant on the type and energy of the incident radiation. The value of wR is 1 for x-rays, gamma rays and beta particles, but higher for protons (wR =5), neutrons (wR is between 5 and 20 depending on energy), alpha particles and heavy fragments (wR = 20) etc.
Permissible dose
- occupational exposure: 20 mSV/year (effective dose)
- lens of eye: 150 mSV/year
- skin: 500 mSV/year
- hands and feet: 500 mSV/year
- fetus (during entire pregnancy): 2 mSV/year
-<p><strong>Equivalent dose</strong> (<em>H<sub>T</sub></em>) is a measure of the radiation dose to tissue where an attempt has been made to allow for the different relative biological effects of different types of ionizing radiation. In quantitative terms, equivalent dose is less fundamental than <a href="/articles/absorbed-dose">absorbed dose</a>, but it is more biologically significant. Equivalent dose has SI units of sieverts but rem (roentgen equivalent in man) is used commonly (1SV = 100REM).</p><p>Equivalent dose (<em>H<sub>T</sub></em>) is calculated by multiplying the absorbed dose to the organ or tissue (<em>D</em><sub><em>T</em></sub>) with the radiation weighting factor, <em>w<sub>R</sub></em>. This factor is dependant on the type and energy of the incident radiation. The value of <em>w</em><sub><em>R</em></sub> is 1 for x-rays, gamma rays and beta particles, but higher for protons, neutrons, alpha particles etc.</p><h4>Permissible dose</h4><ul>-<li>occupational exposure: 20 mSV/year</li>- +<p><strong>Equivalent dose</strong> (<em>H<sub>T</sub></em>) is a measure of the radiation dose to tissue where an attempt has been made to allow for the different relative biological effects of different types of ionizing radiation. In quantitative terms, equivalent dose is less fundamental than <a href="/articles/absorbed-dose">absorbed dose</a>, but it is more biologically significant. Equivalent dose has SI units of sieverts but rem (roentgen equivalent in man) is used commonly (1SV = 100REM).</p><p>Equivalent dose (<em>H<sub>T</sub></em>) is calculated by multiplying the absorbed dose to the organ or tissue (<em>D</em><sub><em>T</em></sub>) with the radiation weighting factor, <em>w<sub>R</sub></em>. This factor is dependant on the type and energy of the incident radiation. The value of <em>w</em><sub><em>R</em></sub> is 1 for x-rays, gamma rays and beta particles, but higher for protons (<em>w</em><sub><em>R </em></sub>=<sub><em> </em></sub>5), neutrons (<em>w</em><sub><em>R </em></sub>is between 5 and 20 depending on energy), alpha particles and heavy fragments (<em>w</em><sub><em>R </em></sub>= 20) etc.</p><h4>Permissible dose</h4><ul>
- +<li>occupational exposure: 20 mSV/year (effective dose)</li>
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