front 1 According to NCRP regulations, leakage radiation from the x-ray tube
must not exceed | back 1 B 100 mR/h |
front 2 If an exposure dose of 50 mR/h is delivered from a distance of 3 ft,
what would be the dose delivered after 20 minutes at a distance of 5
ft from the source? | back 2 A 6 mR |
front 3 The radiographer's radiation monitor report must include which of the following information?1. Lifetime dose equivalent 2. Quarterly dose equivalent 3. Inception date | back 3 D 1, 2, and 3 |
front 4 What is the intensity of scattered radiation perpendicular to and 1 m
from a patient compared with the useful beam at the patient's
surface? | back 4 B 0.1% |
front 5 The minimum requirement for lead-equivalent content in protective
aprons is | back 5 C 0.25 mm Pb. |
front 6 Which of the following statements regarding the pregnant radiographer is (are) true? She should declare her pregnancy to her supervisor. A | back 6 D 1, 2, and 3 |
front 7 A controlled area is defined as one that is occupied by people trained in radiation safety A | back 7 D 1, 2, and 3 |
front 8 The amount of time that x-rays are being produced and directed toward
a particular wall is referred to as the | back 8 B use factor |
front 9 Examples of primary radiation barriers include radiographic room walls A | back 9 C 1 and 3 only |
front 10 The Bucky slot cover is in place to protect the patient A | back 10 C 2 and 3 only |
front 11 The correct way(s) to check for cracks in lead aprons is (are) to fluoroscope them once a year A | back 11 A |
front 12 A student radiographer who is under 18 years of age must not receive
an annual occupational dose of greater than | back 12 A 0.1 rem (1 mSv) |
front 13 Protective devices such as lead aprons function to protect the user from scattered radiation A | back 13 A 1 only |
front 14 To be in compliance with radiation safety standards, the fluoroscopy
exposure switch must | back 14 D be the “dead man” type |
front 15 The dose equivalent limit for a radiography student under the age of
18 years is | back 15 D 0.1 rem. |
front 16 Primary radiation barriers must be at least how high? | back 16 C 7 ft |
front 17 The exposure rate to a body 4 ft from a source of radiation is 16
R/h. What distance from the source would be necessary to decrease the
exposure to 6 R/h? | back 17 B 7 ft |
front 18 Which of the following radiation protection measures is (are) appropriate for mobile radiography? The radiographer must be at least 6 ft from the patient and the
x-ray tube during the exposure. A | back 18 A 1 and 2 only |
front 19 If the exposure rate at 2.0 m from a source of radiation is 18
mR/min, what will be the exposure rate at 5 m from the
source? | back 19 A |
front 20 Which of the following can be an effective means of reducing radiation exposure? Barriers A | back 20 D 1, 2, and 3 |
front 21 If the exposure rate at 3 ft from the fluoroscopic table is 40 mR/h,
what will be the exposure rate for 30 minutes at a distance of 5 ft
from the table? | back 21 A 7 mR |
front 22 The likelihood of adverse radiation effects to any radiographer whose
dose is kept below the recommended guideline is | back 22 C |
front 23 A time of 1.5 minutes is required for a particular fluoroscopic
examination, whose exposure rate is 275 mR/h. What is the approximate
radiation exposure for the radiologic staff present in the fluoroscopy
room during the examination? | back 23 D 6.87 mR |
front 24 Personnel present in the x-ray room during fluoroscopic examinations
wear lead aprons to protect them primarily
from | back 24 B |
front 25 How much protection is provided from a 75-kVp x-ray beam when using a
0.50-mm lead equivalent apron? | back 25 C 88% |
front 26 Under what circumstances might a radiographer be required to wear two dosimeters? During pregnancy A | back 26 A 1 and 2 only |
front 27 Which of the following body parts is (are) included in whole-body dose? Gonads A | back 27 B 1 and 2 only |
front 28 Radiation dose to personnel is reduced by which of the following exposure control cord guidelines?
A 1 only B 1 and 2 only C 2 and 3 only D 1, 2, and 3 | back 28 B 1 and 2 only |
front 29 What should be the radiographer's main objective regarding personal
radiation safety? | back 29 B |
front 30 If the exposure rate to a body standing 3 feet from a radiation
source is 12 mR/min, what will be the exposure rate to that body at a
distance of 7 feet from the source? | back 30 A 2.2 mR/min |
front 31 Secondary radiation barriers usually require the following thickness
of shielding: | back 31 D |
front 32 Sources of secondary radiation include background radiation A | back 32 C 2 and 3 only |
front 33 What percentage of x-ray attenuation does a 0.5-mm lead-equivalent
apron at 75 kVp provide? | back 33 D 88% |
front 34 According to the NCRP, the total gestational dose equivalent limit
for the pregnant radiographer is | back 34 B 5 mSv |
front 35 If the ESE for a particular exposure is 25 mrad, what will be the
intensity of the scattered beam perpendicular to and 1 m from the
patient? | back 35 D |
front 36 What is the minimum requirement for lead aprons, according to 21
CFR? | back 36 C 0.25 mm Pb |
front 37 Some patients, such as infants and children, are unable to maintain
the necessary radiographic position without assistance. If mechanical
restraining devices cannot be used, which of the following should be
requested or permitted to hold the patient? | back 37 B Patient's father |
front 38 If an individual receives an exposure of 150 mR/h at a distance of 2
feet from a radiation source, what will be their dose after 30 minutes
at a distance of 5 feet from the source? | back 38 D 12 mR |
front 39 Each time an x-ray beam scatters, its intensity at 1 m from the
scattering object is what fraction of its original
intensity? | back 39 D 1/1,000 |
front 40 Occupational radiation monitoring is required when it is likely that
an individual will receive more than what fraction of the annual dose
limit? | back 40 C 1/10 |
front 41 Which of the following contributes most to occupational
exposure? | back 41 B Compton scatter |
front 42 Lead aprons are worn during fluoroscopy to protect the radiographer
from exposure to radiation from | back 42 B Compton scatter |
front 43 The single most important scattering object in both radiography and
fluoroscopy is the | back 43 C patient |
front 44 Radiation that passes through the tube housing in directions other
than that of the useful beam is termed | back 44 C leakage radiation |
front 45 How much protection is provided from a 100-kVp x-ray beam when using
a 0.50-mm lead-equivalent apron? | back 45 B |
front 46 Which of the following features of fluoroscopic equipment is (are) designed especially to minimize radiation exposure to the patient and/or personnel? Bucky slot cover A | back 46 D |
front 47 What percentage of x-ray attenuation does a 0.5-mm lead equivalent
apron at 100 kVp provide? | back 47 C 75% |
front 48 In the production of characteristic radiation at the tungsten target,
the incident electron | back 48 A |
front 49 Which of the following formulas is a representation of the
inverse-square law of radiation used to determine x-ray intensity at
different distances? | back 49 A |
front 50 If the exposure rate to a body standing 7 ft from a radiation source
is 140 mR/h, what will be the dose to that body at a distance of 8 ft
from the source in 30 minutes? | back 50 D 53.6 mR |
front 51 How is the intensity of an x-ray photon affected after each time it
scatters? | back 51 D |
front 52 If an individual receives 50 mR while standing 4 ft from a source of
radiation for 2 minutes, which of the following option(s) will most
effectively reduce his or her radiation exposure to that source of
radiation? | back 52 B Standing 8 ft from the source for 2 minutes |
front 53 Primary radiation barriers usually require which thickness of
shielding? | back 53 C 1/16-in. lead |
front 54 How will x-ray photon intensity be affected if the source-to-image
distance (SID) is doubled? | back 54 D Its intensity decreases four times. |
front 55 All the following statements regarding mobile radiographic equipment
are true except | back 55 B exposure switches must be the two-stage type |