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RT Review Part 1

Question 1-50

All of the following are properties / characteristics of radiation except: a. effects biologic tissue b. invisible c. causes the production of scatter d. does not cause any effect on film d. does not cause any effect on film
The amount of rad a patient receives can be reduced by the use of: 1. additional filtration 2. high-ratio grids 3. beam restrictors 1 and 3
Scatter radiation is created whenever a high-energy photon interacts with the: a. moving grid b. stationary grid c. patient d. tungsten target c. patient
During fluoroscopy, the bucky slot cover is used to protect the: 1. patient 2. radiographer 3. radiologist 2 and 3
The unit of absorbed dose, the rad, is determined by which on of the following: a. biological effect of the rad b. counts recorded per minute c. energy deposited per gram d. number of ions produced in a given volume of air c. energy deposited per gram
Which of the following conditions is an example of an early effect of radiation on humans? a. leukemia b. life span shortening c. local tissue damage d. hematologic d. hematologic
What is the LD 50/30 dose for humans in rads? a. 300 b. 425 c. 620 d. 725 a. 300
The agency responsible for enforcing radiation protection regulations is the: a. NRC b. NCRP c. ASRT d. JRC a. NRC (Nuclear Regulatory Commission)(ARST = American Society of RT) (JRC = Joint Research Centre Europe)
All of the following are considered beam limitation devices except: a. cone b. filter c. aperture d. collimator b. filter
Which of the following has no effect on patient dosage? a. mAs b. collimation c. added filtration d. size of focal spot d. size of focal spot
The rad unit best suited for measuring the output of an x-ray tube is the: a. roentgen b. rem c. gray d. rad a. roentgen
If a rad technique of 300 mA, 1/5 sec, 70 kV produces 80mR at 40", what would a technique of 400 mA, 1/3 sec, 70kV produce at 40"? a. 90mR b. 120mR c. 160mR d. 360mR c. 160mR (convert mA x sec to mAs, then create a ratio 60mAs/133mAs = 80mR/X, where x is unknown, then cross multiply and answer comes out to 177) 160mR is closes to answer
Which of the following could be considered a possible radiation induced malignant cancer? 1. skin cancer 2. leukemia 3. bone cancer all
Which projection below will afford the least exposure to the lens of the eye? a. lateral facial bones b. lateral nasal bone c. AP skull d. PA axial skull d. PA axial skull
Which of the following monitors is most accurate in recording dosages below 10 mR? a. pocket ionization chamber b. TLD c. film badges d. victoreen "R" meter b. TLD
All radiation records must be maintained for: a. 1 yr or less b. 5-10 yrs c. 24 mos d. an indefinite period d. an indefinite period
Lead impregnated protective apparel must contain at least: a. .5 mm Al b. .5 mm Pb c. .25 mm Al d. .25 mm Pb d. .25 mm Pb
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? a. 23.1 b. 24.3 c. 26.7 d. 28.8 a. 23.1 (use inverse square law (x/75mR) = (50cm/90cm)2
If a radiographer stands 2ft away from the tube and rec an exposure of 5R/hr, what is the exposure be if they move a position of 5ft away from tube? a. 0.8 b. 1.2 c. 2.08 d. 7.5 a. 0.8 (use inverse square law)
Inherent filtration includes: 1. sheets of aluminum 2. glass window in tube housing 3. insulating oil surrounding the tube 2 and 3
A secondary protective 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 b. 0.4 mm Pb (remember that sheets of lead does not come this small so often times other material is used such as gypsum)
The use of which relative speed of intensifying screen requires the greatest quantity of rad exposure for the pt? a. 50 RS, slow speed b. 100 RS, med speed c. 200 RS RS, high speed d. 800 RS, rare earth a. 50 RS, slow speed
The most efficient device for removing scattered rad from reaching the film is: a. small focal spot b. collimator c. filter d. grid d. grid
An increase of aluminum filtration from 1 mm to 3 mm will reduce a patient's dose by: a. 1/8 b. 1/4 c. 1/2 d/ 3/4 b. 1/4
A shielding device that is placed directly on the patient is called: a. contact b. attenuator c. shadow d. clear lead a. contact
The best place for the operator of a mobile unit to stand, if all other factors are equal, is at which of the following angles from the scattering object? a. 15 b. 45 c. 90 d. 135 c. 90
According to their degree of radiosensitivity, which cell type is more sensitive? a. spermatogonia b. nerve cells c. chondrocytes d. spermatids a. spermatogonia
After exposure the first cells to be affected are the: a. lymphocytes b. thrombocytes c. erythrocytes d. granulocytes a. lymphocytes
On the basis of radiation protection guides, which of the following is permitted the largest accumulated rad dose? a. whole body b. thyroid gland c. GI tract d. hands, forearms and feet d. hands, forearms and feet
The type of interaction with matter which scatters the photon reducing its energy and ionizing the atom is called: a. compton effect b. pair production c. photoelectric effect d. classical scattering a. compton effect
The TLD badge may be worn for as long as: a. 1 mo b. 2 mo c. 3 mo d. 4 mo c. 3 mo
A rad tech'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]
Created by: radtechstudent