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Radt: 456

Radiation Protection

QuestionAnswer
Addresses relative tissue sensitivity and states that stem cells, immature tissues, and miotic cells are radiosensitive. Law of Bergonie and Tribondeau
The effects of radiation are not proportional to the dose receieved Nonlinear curves
Appears a short time after exposure Early effects
Responses that are proportional to the radiation dose received Linear curve
Carcinogensis, cataractogensis, embryologic effect, lifespan shortening. Late effects
Ionization takes place away from the DNA molecule Indirect effect
High LET at the DNA molecule Direct effect
The rate at which radiation deposits energy as it passes through tissue is Linear energy transfer
Two devices that help reduce patient dose Collimator and gonad shield
Irradiation of water molecules within the body and their resulting breakdown radiolysis
Where does most of the populations radiation come from? Background radiation
________ determines the penetrability of the x-ray beam. kV
________ is used to control the quantity of ionizing radiation delivered to the patient. mAs
List 3 types of lead shields Contact, Breast, Shadow
Low ___ and high ____ factors help keep patient dose to a minimum. mAs, kV
Used to automatically regulate the amount of ionizing radiation delivered to the patient and image recorder Automatic Exposure Control (AEC)
____ function to remove a large percentage of scattered radiation. Grids
ALARA as low as resonably achievable
Principal guidelines for reducing radiographic exposure time, distance, shielding
Fluroscopic equipment must provide at least ___ inches between x-ray source and patient. 12
Absorbed dose is measured in rad
rad SI unit Gy
Occupational exposure rem
rem SI unit Sv
As the atomic number of the irradiated tissue increases, a ________ number of x-ray photons are absorbed by the tissue. greater
Created by: kjyochum1
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