FREE RADIOLOGY AND STUDY GAMES ABOUT RADT 456

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FREE RADIOLOGY AND STUDY GAMES ABOUT RADT 456

RAD PROT. EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -55 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: 3 types of secondary radiation barriers include

Answer:

1)control booth 2)lead aprons 3)x-ray tube housing Question 2: Each time an x-ray photon scatters, its intensity at 1 meter from the scattering object is what fraction of its original intensity

Answer:

1/1000

Question 3: Medical and dental radiation accounts for what percentage of the general public's exposure to human-made radiation

Answer:

90%

Question 4: Guidelines used to reduce personnel and/or patient dose in fluoroscopy; 1)..... 2).....

Answer:

1)maximum tabletop intensity 10R/min 2)minimum filtration 2.5 mm Al equivalent

Question 5: Patient dose increases as fluoroscopic

Answer:

FOV decreases

Question 6: Somatic effects of radiation refer to effects that are manifested

Answer:

during life of exposed individual Question 7: The photoelectric effect is more likely to occur with; 1..... 2.....

Answer:

1)absorbers having high Z number 2)positive contrast media Question 8: Primary radiation barriers usually require ___ thickness of shielding

Answer:

1/16 in lead Question 9: What is the intensity of scatter radiation perpendicular to and 1 m from the patient compared with the useful beam at the patient's surface

Answer:

0.1% Question 10: What most effectively can minimize radiation exposure to the patient

Answer:

high-speed intensifying screens

Question 11: Primary radiation barriers must be at least how high

Answer:

• feet

Question 12: Exposure rate to individual standing 4 m from a source of radiation 10mR/h, what will be the dose received after 20 min at a distance of 6 m from the source

Answer:

1.48 mR

Question 13: The most radiosensitive portion of GI tract is the

Answer:

small bowel Question 14: According to the NCRP, the annual occupational dose-equivalent limit(50 rem) to the thyroid, skin, and extremities is

Answer:

500 mSv Question 15: A dose of 0.25 Gy or 25 rad to the fetus during the 3rd/4th week of pregnancy is more likely to cause _____ _____

Answer:

skeletal anomalies Question 16: The interaction between ionization radiation and the target molecule that is most likely to occur is the

Answer:

indirect effect

Question 17: What contributes most to patient dose

Answer:

photoelectric effect Question 18: What type of dose response curve used to predict stochastic effects is the

Answer:

linear nonthreshold Question 19: What personnel monitoring devices used in diagnostic radiography is considered to be the most sensitive and accurate

Answer:

OSL dosimeter

Question 20: Where have sources of radon exposure been identified

Answer:

1)indoors, in houses 2)smoking cigarettes

Question 21: A thermoluminescent dosimetry system would use what crystal

Answer:

lithium fluoride Question 22: The operation of personal radiation monitoring devices can depend upon 1.....2.....

Answer:

1)ionization 2)thermoluminescence

Question 23: The target theory applies to

Answer:

DNA molecules Question 24: The law of Bergonie and Tribondeau states that cells are more radiosensitive if they are 1..... 2.....

Answer:

1)highly proliferative 2)immature Question 25: What type of crystals are used in an optically luminescent dosimetry system

Answer:

aluminum oxide Question 26: The dose of radiation that will cause a noticeable skin reaction is referred to as the

Answer:

SED

Question 27: What cells are most radiosensitive

Answer:

erythroblasts