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RADT 465

Radiation Safety

QuestionAnswer
Radiation dose delivered continuously but at a lower dose rate Protraction
____ syndrome can lead to death within hours to days following exposure. Central Nervous Syndrome
Equal dose of radiation delivered with time interval separations Fractionation
This will improve contrast but will increase patient exposure due to the increase in the technique that is required. Grid
Syndrome of ARS that presents following 600 to 1000 rads of radiation dose. Gastrointestinal
Effects from radiation that do not appear until months or years after exposure. Late
When cels die without attempting to divide; also called interphase death Apoptosis
Operating above ____ kV, an x-ray unit must have 2.5 mm of aluminum filtration. 70
Cataract formation Cataractogenisis
Tissues are more radiosensitive under this condition. Aerobic
_____ should be made at 0.5 mm aluminum equivalent Lead
This typer of graph represents a direct response between radiation dose and biologic effect. Linear
500-600 rads can cause _____ sterility. Permanent
The trimester in which the embryo/fetus is most radiosensitive First
Designed to maintain constant density on images taken on wide variety of patients AEC
As LET increases, cell's chance of survival and recovery _____. Decreases
Any amount of radiation would result in a biological response according to this radiation dose response relationship model. Nonthreshold
Filtration that is present in the x-ray beam due to construction of the x-ray machine Inherent
CNS, GI, and _____ are all syndromes of acute radiation syndrome (ARS) Hematopoietic
Radiation interaction with water; the ionization of water Radiolysis
The rate of energy deposited per unit track length through an absorber. Linear Energy Transfer (LET)
Minimum source to table (patient) distance fo a mobile fluoroscopy unit 12 inches
Signifies the whole body dose of radiation that can be lethal to 50% of the exposed population within 30 days LD 50/30
Theory that used to try to explain why some cells can survive and recover from radiation interactions while other die Target theory
_____ effects occur when radiation interacts with the DNA molecule of a cell Direct
____ film/screen speed system will decrease patient dose but will also decrease recorded detail Increasing
The higher the kVp used, the less patient dose (ESE) there will be, but the image will have a _____ scale of contrast. Longer
Effects from radiation that will occur within minutes, days, weeks, following the exposure. Early
The primary purpose is to reduce the number of low energy x-rays within the useful beam Filtration
Which interaction is the most dangerous to the technologists? Compton Scatter
An electron that gets ejected with a charge Photoelectron
At a higher kVp, ______ is more prevalent. Compton Scatter
Compton Scatter always absorbs ____ of the energy. 2/3
What are the other names for Coherent Scatter? Classical, Unmodified, Thompson, and Raleigh Scatter
No harm, no foul defines which interaction? Coherent Scatter
The emission of the secondary radiation during Photoelectric Absorption allows the body to produce _____. Internal radiation/characteristic radiation
This interaction occurs below 10 kV. Coherent Scatter
Deals with germ cells Meosis
Deals with every other cell within the body Mitosis
True/False: You want a low kVp with a high mAs when taking an exposure. False
When positioning for a skull/facial bones, should you place the patient AP or PA? PA
When positioning for a cervical oblique, should you place the patient AP or PA? PA (RAO/LAO)
When positioning for a thoracic spine, should you place the patient AP or PA? PA (RAO/LAO)
What is the minimum lead equivalent for lead aprons? 0.5 mm Pb/eq
What is the minimum lead equivalent for gloves? 0.25 Pb/eq
What is the minimum lead equivalent for thyroid shields? 0.5 mm Pb/eq
What is the minimum lead equivalent for glasses? 0.35 mm Pb/eq
What is the minimum lead equivalent for bucky slot covers? 0.25 mm Pb/eq
What is the minimum lead equivalent for fluoroscopy drapes? 0.25 mm Pb/eq
What is the minimum lead equivalent for clear lead-plastic overhead protective barrier? 0.5 mm Pb/eq
What is the annual occupational dose limit? 50 mSv or 5 rem
What is the annual occupational dose limit for the lens of the eye? 150 mSv or 15 rem
What is the annual occupational dose limit for the skin, hands, and feet? 500 mSv or 50 rem
What is the annual public dose limit? 5 mSv or 0.5 rem
What is the annual public dose limit for the lens of the eye, skin, hands, and feet? 50 mSv or 5 rem
What is the occupational dose limit of an embryo per month? 0.5 mSv or 0.05 rem
What is the dose limit for the entire gestation for an occupational embryo? 5 mSv or 0.5 rem
What is the SI unit for Roentgen (R)? C/kg
What is the SI unit for Rad? Gy
What is the SI unit for Rem? Sv
What is the Si unit for Curie? Bq
Created by: MariahKesterson