RADT 1200 Chapter 4 Questions and Answers All Correct
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Module
RADT 1200
Institution
RADT 1200
RADT 1200 Chapter 4 Questions and Answers All Correct
The amount of ionizing radiation that may strike an object such as the body when in the vicinity of a radiation source
Does not necessarily indicate dose - Answer-Exposure
Exposure in air - Answer-Air Kerma- expressed in metric unit of j...
RADT 1200 Chapter 4 Questions
and Answers All Correct
The amount of ionizing radiation that may strike an object such as the body when in the
vicinity of a radiation source
Does not necessarily indicate dose - Answer-Exposure
Exposure in air - Answer-Air Kerma- expressed in metric unit of joule per kilogram (J/kg)
As the intensity of x-ray exposure in air ________, the number of electro-ion pairs
produced _________. - Answer-increases, increases
The deposition of energy per unit mass by ionizing radiation in the patient's body tissue
- Answer-Absorbed dose
Absorbed Dose - Answer-Traditional unit is the Rad
• SI unit is the Gray
• 1 Gray = 100 Rad
• 1 Rad = 0.01 Gray
Based on the linear energy transfer (LET) of the radiation type - Answer-Quality factors
Is the amount of energy transferred on average by incident radiation to an object per
unit length track through an object - Answer-LET (expressed in units of keV/um)
-product of the average absorbed dose in a tissue or organ in the body
-includes its associated radiation weighting factor
- EqD = D x W r - Answer-Equivalent Dose (EqD)
-provides a measure of the overall risk of exposure to ionizing radiation
-NCRP report #116 defines it as the sum of the weighted equivalent doses for all
irradiated tissues or organs
-incorporates type of radiation used and the radiosensitivity of the organ being irradiated
- Answer-Effective Dose (EfD)
Tolerance dose reduced to - Answer-0.1 roentgen
MPD - Answer-maximum permissible dose
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