pages 58-63 last minute added exam info
What is the annual and lifetime dose for occupational workers?
Annual: 50 mSv (5 rem)
Lifetime: 10 mSv (1rem) x years of age
What is the annual dose for the general public?
Annual: 1 mSv (100 mrem)
What is the annual dose for individuals less than 18 years of age?
1 mSv (100 mrem)
What is the dose limiting recommendations for pregnant workers?
0.5 mSv (50 mrem)
gestational period 5 mSv (500 mrem)
As Low As Reasonably Achievable
Four important ways ALARA can be achieved
Always wear personal monitoring device
use mechanical holding devices if procedure permits
what are the cardinal principles
Gonadal contact shields are made of
1 mm lead equivalent
gonadal shielding absorbs what percentage of primary rays in the 50-100 kV range?
What is the minimum total filtration (inherent plus added) for diagnostic radiology (excluding mammography)?
2.5 mm aluminum for equipment operating at 70 kV or higher
indicates the amount of energy transferred to a mass of air photons
Rad to Gray (Gy) conversion
Multiply by 10-2
1 Rad = 0.01 Gy
Roentgen to C/kg (coulomb per kilogram)
multiply by 2.58 x 10-4
1 R = 0.000258
Rem to Sievert (Sv)
multiply by 10-2
1 Rem = 0.01 Sv
Rad or Gy
unit for absorbed dose
used primarily for patient dose
Rem or Sv
used primarily for radiation protection purposes
attach to the collimator, placed between the x-ray tube and the patient and cast a shadow on the patient when the collimator light is turned on. The shadow defines the shielded area
vinyl covered lead shields placed over patients to attenuate scatter or leakage radiation or both.