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50 Cards in this Set
- Front
- Back
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Which of the following are units of measure used to express absorbed dose?
a. Sievert b. Rad C. Gray D. Rem |
D. Rad
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Five Rem is = to:
a. 5 mSv b. 50 mSv c. 500 mSv d. 5,000 mSv |
Five Rem=
b. 50 mSv |
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Where should the radiographer wear a film badge durin a fluoroscopic study?
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On th collar above the apron
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The term used to express the quantity of radiation received by radiation workers (includin dosimeter reports) is?
a. (DE) Dose Equivalent b. (AD) Absorbed Dose c. (REM) Radiation Equivalent Man d. (RAD) Radiation Absorbed Dose |
(REM) Radiation Equivalent Man
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According to the NCRP, a 34 year old radiographer may sustain a cumulative exposure of:
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34 rem
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All of the followin are properties/characteristics of radiation except:
a. effects bioloical tissue b. invisable c. causes the production of scatter d. does not cause any effect on film |
d. does not cause any effect on film
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The loss of hair from exposure to large amounts f radiation is called...
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epilation
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The amount of radiation a patient receives can be reduced by the use of:
1. additional filtrations 2. high-ratio grids 3. beam restrictors |
1. additional filtrations
& 3. beam restrictions |
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Scatter radiation is created whenever a high-energy photon interacts with what?
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Patient
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During fluoroscopy, the bucky slot cover is used to protect:
1. patient 2. radiographer 3. radiologist |
2. radiographer
& 3. radiologist |
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Which of the followin is a cell that has the greatest senesitivity to radiation?
a. nerve cell b. bone cell c. lymph cells d. muscle cells |
c. lymph cell
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The unit of absorbed dose, the rad, is determinded by which of the following?
a. biological effect of the radiation b. counts recorded per min' c. energy depositied per gram d. number of ions produced in a given volume of air |
c. energy depositied per gram
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which of the following conditions is an example of an early effect of radiation on humans?
a. cancer b. life span shortening c. cataracts d. hematologic changes |
D. hematological changes
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Which of the followin is a lon-term effect of a radiation exposure?
a. cataracts b. infection c. nausea d. vomiting |
a. cataracts
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What is the LD 50/30 dose for humans in rads?
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300
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The agency responsible for enforcin radiation protection regulations is the...?
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N.R.C
Nuclear Regulatory Commission |
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All of the following are considered beam limitation devices except:
a. cone b. filter c. aperture d. collimator |
b. filter
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Which of the following has NO effect on patient dosage?
a. mAs b. collimation c. added filtation d. size of focal spot |
d. size of focal spot
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the radiation unit best suited for measuring the output of an x-ray tube is the...?
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roentgen
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If a radiograhpic tech of 300 mA, 1/5 sec, 70 kV produces 80 mR at 40", what would a tech of 400 mA, 1/3 sec, 70 kV produce @ 40"?
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160 mR
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Which of the following could be considered a possible radiation induced malignant cancer?
1. skin cancer 2. leukemia 3. bone cancer |
All listed
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Which projection below will afford the least exposure to the lens of the eye?
a. lateral skull b. AP Townes C. AP Skull D. PA Skull |
PA Skull
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Which of the followin monitors is most accurate in recording dosages below 10 mRem?
a. pocket ionization chamber b. TLD c. Film badge d. Victoreen "R" meter |
TLD - thermo Luminescent Dosimeter
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All radiation records must be maintained for:
a. 1 yr or less b. 5-10 yrs c. 2 yrs d. an indefinite period |
d. an indefinite period
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Lead impregnated protective apparel must contain at least how much lead in mm?
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0.25 mm Pb equivalent
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Which imagin unit produced the greatest amount of radiation output and affords the lowest amount of exposure to the patient?
a. single phase, half wave unit b. single phase, full wave unit c. 3 pahse, 6 pulse unit d. 3 phase, 12 pulse unit |
d. 3 phase, 12 pulse unit
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The dose rate at 50 cm from a source is 75 mR per Hour. What is the dose rate in mR per hour at 90 cm?
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23
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If a radiographer stands 2 ft away from an x-ray tube and receives an exposure of 5R/hr, what will the exposure be, if the same radiographer moves to a position 5 ft away from an x-ray tube?
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0.8
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inherent filtration includes:
1. sheets of aluminum 2. glass window in tube housing 3. insulating oil surroundin the tube |
2&3
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Which of the following exams would require ale gonadal shielding?
a. oblique views of the hips b. pelvis c. visualization of the rectum d. voiding cystourethograms |
b. pelvis
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A secondary protetive barrier must have a lead equivalence of at least:
a. 0.2 mm Pb b. 0.4 mm Pb c. 0.6 mm Pb d. 0.8 mm Pb |
d. 0.8 mm Pb
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The use of which relative speed (RS) intensifying screen requires the greatest quanity of radiation exposure for the patient?
a. 50 RS, slow speed screen b. 100 RS, medium speed screen c. 200 RS, high speed screen d. 800 RS, rare earth screen |
a. 50 RS, slow speed screen
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The most efficient device for removin scatter radiation from reaching the film is:
a. Smal FS b. collimation c. filter d. grid |
d. grid
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assumin the HVL of a beam iis 1mm aluminum, an increase of aluminum filteration from 1mm to 3mm will reduce a patients dose to ____ of the original value
a. 1/8 (12.5%) b. 1/4 (25%) c. 1/2 (50%) d. 3/4 (75%) |
b. 1/4 (25%)
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A shieldin device that is placed directly on the patient is called
a. contact b. attenuator c. shadow d. clear lead |
a. contact
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Thr best place for the operator of mobile unit to stand, if all other facts are =, is a which of the following angles from the scattering objects?
a. 15 b. 45 c. 90 d. 135 |
c. 90
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The radiation that exits the housing of the x-ray tube is called
a. remnant b. leakage c. scatter d. Bremsstrahlung |
b. leakage
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According to their degree of radiosensitivity, which cell type is more sensitive?
a. spematogonia b. nerve cells c. chondrocytes d. spermatids |
a. spermatogonia
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Which of the following type of cell is MOST radiosensitive?
a. osteoblasts b. fibroblasts c. erythroblasts d. chondrocytes |
c. erythroblasts
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After an exposure the first cell to be affected are the:
a. lymphocytes b. thrombocytes c. erythrocytes d. chondrocytes |
a. lymphocytes
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Which of the following is a late somatic effect from exposure to ionizing radiation?
a. carcinogenesis b. stochastic (probabilistic) c. Erythema D. Threshold dose response |
A. Carcinogenesis
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On the basis of radiation protection guides, which of the followin is permitted the largest accumulated radiation dose?
a. whole body b. thyroid gland c. gastrointestinal tract d. hands, forearms, and feet |
d. hands, forearms, and feet
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A protective lead drape is used as a way to protect the professional when doin _____ procedures
a. tomography b. portables c. fluoroscopy d. automatic exposure |
c. fluoroscopy
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The use of proper beam restriction will:
1. increase production of scatter 2. decrease patient dose 3. increase patient dose |
2. decrease patient dose
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The type of interation with matter which scatters the photon reducing its energy and ionizing the atom is called:
a. compton effect b. pair production c. photoelectic effect d. classical scattering |
A. compton effect
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Cataracts created from large exposures are to be found in the:
a. thyroid b. eye c. thymus d. gonads |
b. eye
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If the tube housing is properly designed, the leakage radiation will never exceed the reulatory limit of:
a. 100mR/min @ 1m b. 100mR/wk @ 1m c. 100 mR/day @ 2 min d. 100mR/hr @ 1 m |
D. 100Mr/hr @ 1 m
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The thermoluminescent dosimeter badge may be worn for as long as:
a. 1 month b. 2 months c. 3 months d. 4 months |
c. 3 months
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A radiographer's occupational dosimeter reading is recorded in units of:
a. Roentgen [R] b. milli-Roentgen [mR] c. milli-rem [mrem] d. coloumb per kilogram [c/kg] |
c. milli-rem [mrem]
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Which exposure setting will afford the least exposure to the patient?
KV @ mAs a. 90 @10 b. 80@20 c. 70@40 d. 60@80 |
a. 90@10
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