{"id":25409,"date":"2019-10-29T13:42:15","date_gmt":"2019-10-29T13:42:15","guid":{"rendered":"http:\/\/sitepourvtc.com\/?page_id=25409"},"modified":"2023-06-15T06:10:15","modified_gmt":"2023-06-15T06:10:15","slug":"sievert-unit-of-equivalent-dose","status":"publish","type":"page","link":"https:\/\/sitepourvtc.com\/nuclear-engineering\/radiation-protection\/equivalent-dose\/sievert-unit-of-equivalent-dose\/","title":{"rendered":"Sievert – Unit of Equivalent Dose"},"content":{"rendered":"
<\/a>In radiation protection, a sievert<\/strong> is a derived unit of equivalent dose<\/strong> and effective dose. <\/strong>The sievert represents the equivalent biological effect of depositing a joule of gamma rays energy in a kilogram of human tissue. Unit of sievert is important in radiation protection and was named after the Swedish scientist Rolf Sievert, who did a lot of the early work on dosimetry in radiation therapy.<\/p>\n As was written, the sievert is used for radiation quantities such as equivalent and effective doses. Equivalent dose<\/strong> (symbol H<\/strong>T<\/sub><\/strong>)<\/strong> is a dose quantity calculated for individual organs (index T \u2013 tissue). The equivalent\u00a0dose<\/strong> is based on the absorbed dose to an organ, adjusted to account for the effectiveness of the type of radiation<\/strong>. An equivalent dose is given the symbol HT<\/sub>. The SI unit of H<\/strong>T<\/sub><\/strong> is the sievert<\/strong> (Sv) or but rem (roentgen equivalent man) is still commonly used (1 Sv = 100 rem<\/strong>).<\/p>\n For radiation protection<\/a> purposes, the absorbed dose is averaged over an organ or tissue, T. This absorbed dose average is weighted for the radiation quality in terms of the radiation weighting factor<\/strong><\/a>, wR<\/sub>, for the type and energy of radiation incident on the body. The radiation weighting factor<\/strong> is a dimensionless factor used to determine the equivalent dose from the absorbed dose averaged over a tissue or organ. It is based on the type of radiation absorbed. The resulting weighted dose was designated as the organ- or tissue equivalent dose:<\/p>\nSievert and Gray<\/h2>\n