Health Physics I: Unit 2 Review Flashcards
Unit review for Chapters 4-5
As the intensity of x-ray exposure of the air volume increases, the number of electron–ion pairs produced:
increases
Units that specify dose area product (DAP)
mGy-cm2
Types of ionizing radiation that produce virtually the same biologic effect in body tissue for equal absorbed doses
X-rays; beta particles; gamma rays
Theory that relates to the ionization produced in a small cavity within an irradiated medium or object to the energy absorbed in that medium as a result of its radiation exposure
Bragg-Gray
Alpha particles have a radiation weighting factor (WR) that is numerically equal to
20
First American radiation worker to die from radiation-induced cancer in October of 1904
Clarence Madison Dally
An energy absorption of 1 J/kg of matter in the irradiated object equals which of the following
1 Gy
Formula used to calculate effective dose
EfD = D × WR × WT
1 gray equals
100 cGy (centigray)
Beta particles are:
Protons
The sum total of air kerma over the exposed area of the patient’s body surface:
Dose area product
Radiation quantities that may be defined as the measure of the total electric charge of one sign, either all pluses or all minuses, per unit mass that these two types of radiation generate in dry air at standard temperature and pressure (760 mm Hg or 1 atmosphere at sea level and 22° C)
Exposure
Physicians cancer deaths attributed to x-ray exposure were reported as early as what year?
1910
The total kinetic energy released in a unit mass (kilogram) of air and expressed in metric units of joules per kilogram is
Air kerma
Early tissue reactions of ionizing radiation that were experienced by early radiation workers
Diffuse redness of skin
Blood disorders
Intestinal disorders
SI unit of electric current
Ampere
What do radiation weighting factors primarily take into consideration?
Some types of radiation are more efficient at causing biologic damage than other types of radiation for a given dose
Cataract formation, fibrosis, reduced fertility and sterility are classified as
Late tissue reactions of ionizing radiation