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RADT 465: Rad Prot

Radiation Protection

QuestionAnswer
According to the NCRP, the monthly gestational dose equivalent limit for embryo / fetus of a pregnant radiographer is (pg. 135 #2) 5 mSv
The interaction between ionizing radiation and the target molecule that ism most likely to occur is the (pg. 136 #8) Indirect effect
What is the approximate entrance skin exposure (ESE) fir the average AP supine abdomen radiograph? (pg. 136 #9) 300 mrad
What is the established annual occupational dose equivalent limit for the lens of the eye? (pg. 136 #12) 150 mSv
Occupational radiation monitoring is required when it is possible that the individual might receive more than (pg. 136 #13) 1/10 the annual dose limit
With mA increased to maintain output intensity, how is the ESE affected as the source to skin (SSD) is increased? (pg. 137 #20) The ESE increases
Each time an x-ray beam scatters, its intensity at 1m from the scattering object is what fraction of its original intensity? (pg. 137 #22) 1/1,000
According to the NCRP, the annual dose occupational whole body dose equivalent limit is (pg. 137 #23) 50 mSv
Sources of secondary radiation include (pg. 137 #25) Leakage radiation and scattered radiation
The photoelectric effect is most likely to occur with (pg. 138 #27) Absorbers having a high Z number and positive contrast media
Medical and dental radiation accounts for what percentage of the general public's exposure to human made radiation? (pg. 138 #34) 90%
What are composed of non-diving differentiated cells? (pg. 139 #35) Neurons and neuroglia
Immature cells are referred to as (pg. 139 #39) Undifferentiated cells and stem cells
What is the term used to describe x-ray photon interaction with matter and the transfer of part of the photon's energy to matter? (pg. 139 #40) Scattering
The annual dose limit for occupationally exposed individuals is valid for (pg. 139 #44) Beta, x-, and gamma radiations
Patient dose increases as fluoroscopic (pg. 140 #46) FOV decreases
What unit of measuring is used to express ionizing radiation dose to biologic material? (pg. 140 #48) Rem (Sv)
Biologic material is least sensitive to irradiation under what condition? (pg. 140 #52) Anoxic
According to the NCRP regulations, leakage radiation from the x-ray tube must not exceed (pg. 141 #60) 100 mR/h
Diagnostic x-radiation may be correctly described as (pg. 142 #66) Low energy, low LET
According to the NCRP, the annual occupational dose equivalent limit (50 rem) to the thyroid, skin, and extremities is (pg. 142 #70) 500 mSv
Which type of personnel radiation monitor can provide an immediate reading? (pg. 144 #86) Ionization chamber
Factors that contribute to the amount of scattered radiation produced include (pg. 144 #92) Radiation quality and field size
The SSD for mobile fluoroscopy must be (pg. 145 #93) A minimum of 12 inches
The automatic exposure device that is located immediately under the x-ray table is (pg. 145 #94) Ionization chamber
The Law of Bergonie and Tibondeau states that cells are more radiosensitive if they are (pg. 145 #95) Highly proliferative and immature
The most radiosensitive portion of the GI tract is the (pg. 146 #103) Small bowel
The photoelectric effect is an interaction between an x-ray photon and (pg. 146 #105) An inner shell electron
What is considered the unit of exposure in air? (pg. 147 #110) Roentgen (C/kg)
Any wall that the useful x-ray beam can be directed toward is called a (pg. 147 #115) Primary barrier
In the production of characteristic radiation at the tungsten target, the incident electron (pg. 149 #131) Ejects an inner shell tungsten electron
The term effective dose refers to (pg. 150 #134) Whole body dose
What interaction between ionizing radiation and the target molecule involves formation of a free radical? (pg. 150 #139) Indirect effect
What is the approximate ESE for the average AP lumbar spine radiograph? (pg. 151 #143) 300 mrad
The types of secondary radiation barriers include (pg. 151 #145) The control booth, lead aprons, and the x-ray tube housing
The dose of radiation that will cause a noticeable skin reaction is referred to as the (pg. 152 #152) SED
Protective devices such as lead aprons function to protect the user from (pg. 153 #164) Scattered radiation
The primary function of filtration is to reduce (pg. 153 #165) Patient skin dose
Radiation output from a diagnostic x-ray tube is measured in which of the following units of measurement? (pg. 197 #187) Roentgen
According to the NCRP, the pregnant radiographer's gestational dose equivalent limit for a 1 month period is (pg. 157 #193) 0.5 mSv
The target theory applies to (pg. 157 #195) DNA molecules
Created by: rdwilliams1