Midterm ch. 4 Flashcards
0.2 Gy equals
200 mGy
The total kinetic energy released in a unit mass (kilogram) of air and expressed in metric units of joules per kilogram is
air kerma.
Which of the following formulas is used to calculate effective dose?
- EfD = (D x WR)1 + (D x WR)2 + (D x WR)3
- EfD = D x WR x WT
- EfD = D ÷ WR x WT
- EfD = D x WR x WT
Alpha particles have a radiation weighting factor (WR) that is numerically equal to
20.
How is dose area product usually specified?
In units of mGy-cm2
Which of the following was used as the first measure of exposure for ionizing radiation?
Skin erythema
A radiation weighting factor (WR) has been established for each of the following ionizing radiations: x-rays (WR = 1), fast neutrons (WR = 20), and alpha particles (WR = 20). What is the total equivalent dose (EqD) in sieverts for a person who has received the following exposures: 0.2 Gyt of x-rays, 0.07 Gyt of fast neutrons, and 0.3 Gyt of alpha particles?
7.6 Sv
Which of the following is the unit of collective effective dose (ColEfD)?
Person-sievert
The concept of tissue weighting factor (WT) is used to do which of the following?
Account for the risk to the entire organism brought on by irradiation of individual tissues and organs
To convert the number of gray into milligray, the number of gray must be:
Multiplied by 1000
What is the SI radiation unit coulomb per kilogram used to specify?
Radiation exposure in air only
Which of the following radiation quantities accounts for some biologic tissues being more sensitive to radiation damage than other tissues?
Effective dose
The radiation weighting factor for alpha particles is 20, and the tissue weighting factor for the lungs is 0.12. If the lungs receive an absorbed dose of 0.2 Gyt from exposure to alpha particles, what is the effective dose in sievert?
0.48 Sv
If 100 people received an average effective dose of 0.35 Sv, what is the collective effective dose?
35 person-sieverts
How is the SI unit for dose area product (DAP) usually specified?
mGy-cm2
