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Basic Rad Units

Basic Radiation Units

QuestionAnswer
Conventional Unit of Exposure Roentgen (R)
SI Unit of Exposure Coulomb/kg (C/kg)
Conventional Unit of Absorbed Dose rad (R x f-factor)
SI unit of Absorbed Dose gray (Gy)
How many rads in 1 Gy? 100 rads = 1Gy
Conventional unit of Equivalent dose rem
SI unit of Equivalent dose sievert (Sv)
How many rem in 1 Sv? 100 rem = 1Sv
Conventional unit of radioactivity Curie (Ci)
SI unit of radioactivity becquerel (Bq)
Definition of Exposure? Metric of ionization of air due to radiation. Only defined for xrays and gamma rays.
Definition of Absorbed dose? Energy deposited by radiation in a given mass of material.
What are some qualities of the f-factor? Varies with Z, varies with photon energy. At diagnostic levels, is >1 for bone, roughly = 1 for soft tissue, and <1 for fat.
Definition of Equivalent dose? Absorbed dose x radiation weighting factor. Corrects for the fact that heavy particulate radiation (protons, neutrons, alpha) are more damaging that EMR and electrons.
Radiation weighting factor of X-rays, gamma rays, beta particles, and electron? 1
Radiation weighting factor of protons? 5
Radiation weighting factor of neutrons? 5-20 (energy dependent)
Radiation weighting factor of alpha particles and other multiple charged particles? 20
Definition of Effective Dose? equivalent dose x tissue weighting factor. Considers how sensitive given tissue is to radiation.
What tissue has the highest tissue weighting factor? Gonads (20)
What number do all tissues weighting factors summed equal? 1
What was the original definition of the curie? the activity of 1g of pure radium (3.7 disintegrations/s)
How many dps (disintegrations per second) per Bq? 1 dps
Created by: jbs42
 

 



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