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Radiation Absorbed Dose
 
(rad) One rad is the absorbed radiation dose of 100 ergs of energy by one gram or 0.01 joules of energy by one kilogram of matter. In the SI system of units, the rad is replaced by the gray (Gy). 1 Gy = 100 rad.
 
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Dosage
 
Dosage is an important factor in the use of ionization radiation as well as in application of contrast agents or radiopharmaceuticals and the dosage should be comply with the ALARA principle (As Low As Reasonably Achievable).
Ionizing radiation comes from natural and artificial sources. Radiation effects depend on the type of radiation, and various units are used for measurement of dosages including gray, sievert, radiation absorbed dose (RAD), roentgen equivalent in man (REM), and roentgen. The amount of radiopharmaceutical given to a patient is measured in becquerels (Bq).
The dosage of contrast media in radiographic or computer-tomographic procedures should be tailored according to the diagnostic indications, the iodine concentration, and the patient's body size and age.
See also Administrative Dose Guidelines.


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Weight-based intravenous contrast injection parameters for Enhanced CT ScanningOpen this link in a new window
'What is this page all about? It's for radiologists to use for CT scanning ( "cat scans" or "computed tomography"). It's like a ...'
by www.halls.md    
Radiation DosagesOpen this link in a new window
'Ionizing radiation comes from natural and artificial sources. The energy absorbed from exposure to radiation is called a dose. ...'
by www.science.uwaterloo.ca    
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Gray
 
(Gy) Gray is the SI unit of absorbed radiation dose. 1 Gray is equal to the energy absorption of 1 Joule per kilogram. The absorbed dose due to any type of radiation is measured in Gray. 1 Gray is equal to 100 rads in the older terminology.

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Roentgen Equivalent In Man
 
(rem) The rem is the dose equivalent of the absorbed dose considering the biological efficiency of the radiation, also called quality factor. With a quality factor of 1 is 1 rem equal to 1.07185 roentgens. One millirem is one thousandth of one rem.
In the SI system of units the rem is replaced by the sievert (Sv), which is numerically equal to the absorbed dose in gray modified by a radiation weighting factor. The conversion factor has been readjusted from 1 to 1.07185 so that 100 rem are equal to 1 Sv.


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Röntgen equivalent manOpen this link in a new window
'The röntgen (roentgen) equivalent in man or rem (symbol rem) is a unit of radiation dose. It is the product of the absorbed dose ...'
by en.wikipedia.org    
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Air Kerma
 
Air KERMA (Kinetic Energy Released per unit MAss of air) measures the amount of radiation energy in air, unit is J/kg. This include the initial kinetic energy of the primary ionizing particles such as photoelectrons, Compton electrons, positron//negatron pairs from photon radiation, and scattered nuclei from fast neutrons, when for example air is irradiated by an x-ray beam. J/kg (gray) is also the unit of the radiation quantity 'Absorbed Dose'.


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Radiation Quantities and UnitsOpen this link in a new window
'Introduction and Overview Several forms of ionizing radiation are used in medical imaging. Even though the risk is low, if there ...'
by www.sprawls.org    
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