Module 5 Flashcards
(26 cards)
Two systems of measurements
Traditional (British)
Systeme internationale (SI)
Exposure units for SI and traditional
SI: coulombs per kilogram (C/kg)
Trad: roentgen (R)
1 R = ? C/kg
2.58 x 10^-4
Roentgen (R) is the quantity of?
Radiation that will produce 2.08 x 10^9 ion pairs in one cm^3 of air
Dose units for SI and Traditional
SI: gray (Gy)
Trad: radiation absorbed dose (rad)
1 Gy = ? Rad
100
Dose equivalent units for SI and traditional
SI: Sievert (Sv)
Trad: radiation equivalent in man (rem)
Sv = ? x Wr
Gy
1 Sv = ? Rem
100
Rem = ? x Wr
Rad
1 cGy = ? Rad
1
4 characteristics that the Law of Beegonié and Tribondeau depend on
Age
Differentiation
Metabolic rate
Mitotic rate
Short term somatic effects
3 months of exposure
High radiation doses
Body system affected: CNS, GI, hematological
Long term/ latent somatic effects
30+ years
Affect body if the irradiated indiv. Directly
Damage to reproductive cells
Stochastic effects
No specific amount of exposure needed
Higher chance when dosage is increased
No correlation btn dosage and severity
Maybe repeated small doses
Three principal methods of protection
Time - Min
Distance - Max
Shielding - always
Dosimeters are what?
Monitors used for personal radiation exposure
Worn at the collar with label facing out
How to find cumulative (lifetime ) dose limit
1 rem (10 mSv) x age
Effective dose (EfD) limit per year for occupational exposed
50 mSv
Type of personal radiation dosimeter
OSL
Genes that are expressed in the individual
Dominant
Long term radiation effects that are apparently random and have no threshold amount of exposure that must be received for them to occur
Stochastic
The effective dose equivalent limit for whole body, occupational radiation exposure to nonpregnant radiation workers older than 18 years
50 mSv
The term radiation sickness refers to
Short term gastrointestinal effects
