Absorbed dose (also known as total ionizing dose, TID) is a measure of the energy deposited in a medium by ionizing radiation. Image talkNew_radiation_symbol_ISO_21482svg for details --> Ionizing radiation It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg, which is given the special name gray (Gy). The gray (symbol Gy is the SI unit of absorbed radiation dose.
Note that the absorbed dose is not a good indicator of the likely biological effect. 1 Gy of alpha radiation would be much more biologically damaging than 1 Gy of photon radiation for example. Alpha particles (named after and denoted by the first letter in the Greek alphabet, α consist of two Protons and two Neutrons bound together into a In Physics, the photon is the Elementary particle responsible for electromagnetic phenomena Appropriate weighting factors can be applied reflecting the different relative biological effects to find the equivalent dose. The equivalent dose ( H T) is a measure of the Radiation dose to tissue where an attempt has been made to allow for the different relative biological
The risk of stochastic effects due to radiation exposure can be quantified using the effective dose, which is a weighted average of the equivalent dose to each organ depending upon its radiosensitivity. Stochastic (from the Greek "Στόχος" for "aim" or "guess" means Random.
When ionising radiation is used to treat cancer, the doctor will usually prescribe the radiotherapy treatment in Gy. Radiation therapy (or radiotherapy) is the medical use of Ionizing radiation as part of Cancer treatment to control Malignant When risk from ionising radiation is being discussed, a related unit, the sievert is used. The sievert (symbol Sv is the SI derived unit of dose equivalent.
See also
External links
- Specific Gamma-Ray Dose Constants for Nuclides Important to Dosimetry and Radiological Assessment, Laurie M. Unger and D. K . Trubey, Oak Ridge National Laboratory, May 1982 - contains gamma-ray dose constants (in tissue) for approximately 500 radionuclides. Specific absorption rate (SAR is a measure of the rate at which Radio frequency (RF energy is absorbed by the body when exposed to radio-frequency electromagnetic field
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