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RTBC - RADIATION PROTECTION STUDY GUIDE WITH ANSWERS, Exams of Radiography

RTBC - RADIATION PROTECTION STUDY GUIDE WITH ANSWERS

Typology: Exams

2024/2025

Available from 11/20/2024

richard-nyamweya
richard-nyamweya 🇺🇸

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RTBC - RADIATION PROTECTION STUDY
GUIDE WITH ANSWERS
The primary purpose of the ALARA principal and diagnostic imaging is to
Reduce radiation does to occupational workers
A radiation worker receive the radiation dose of 5 mGy while participating in a
fluoroscopy procedure for 10 minutes. What radiation dose would have been
received by the worker if they reduce their time in the radiation field to only
five minute?
2.5 mGy
Which cardinal rule of radiation protection is mathematically defined by the
inverse square law
Distance
In order to reduce a Technologist occupational dose during a portable
radiograph of the chest, the technologist should
Stand several feet away from the patient during the exposure
During a surgical procedure, using three minutes of fluoroscopy time, a
radiographer receives an effective dose of 1 mSv. What effective those would
be experienced by the radiographer, if the fluoroscopy time is doubled?
2 mSv
A radiographer is exposed to a dose rate of 10 mSv per hour, while standing 3
feet from the patient during see arm procedures. What is the approximate dose
rate if the radiographer stands for feet from the patient?
5.6 mSv/hr
A radiologist receives an equivalent dose of 100 microsieverts while standing
25 cm from a patient during a fluoroscopy procedure. Estimate the equivalent
dose if the radiologist and 10 cm from the patient.
625 microsieverts
Which three of the following properties of lead make it a valuable material for
radiation shielding devices?
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RTBC - RADIATION PROTECTION STUDY

GUIDE WITH ANSWERS

The primary purpose of the ALARA principal and diagnostic imaging is to Reduce radiation does to occupational workers A radiation worker receive the radiation dose of 5 mGy while participating in a fluoroscopy procedure for 10 minutes. What radiation dose would have been received by the worker if they reduce their time in the radiation field to only five minute? 2.5 mGy Which cardinal rule of radiation protection is mathematically defined by the inverse square law Distance In order to reduce a Technologist occupational dose during a portable radiograph of the chest, the technologist should Stand several feet away from the patient during the exposure During a surgical procedure, using three minutes of fluoroscopy time, a radiographer receives an effective dose of 1 mSv. What effective those would be experienced by the radiographer, if the fluoroscopy time is doubled? 2 mSv A radiographer is exposed to a dose rate of 10 mSv per hour, while standing 3 feet from the patient during see arm procedures. What is the approximate dose rate if the radiographer stands for feet from the patient? 5.6 mSv/hr A radiologist receives an equivalent dose of 100 microsieverts while standing 25 cm from a patient during a fluoroscopy procedure. Estimate the equivalent dose if the radiologist and 10 cm from the patient. 625 microsieverts Which three of the following properties of lead make it a valuable material for radiation shielding devices?

  • High atomic number
  • High mass density
  • High attenuation Which of the following materials requires the smallest half value layer (HVL) to effectively attenuate the x-ray beam? Lead How does radiation dose change if a Technologist increases their distance from radiation source by a factor of 2? Dose decreases by a factor of two squared A half value layer (HVL) is the thickness of material required to reduce which of the following by half? X-ray beam intensity Is shielding device constructed with a sickness equivalent to 1 HVL will reduce the quantity of radiation to 50% of the original quantity Is shielding device constructed with a sickness equivalent to two have value layers will reduce the quantity of radiation to 25% of the original quantity If they have value layer of shielding material is equal to 2mm, how much radiation will transmit through 6 mm of this material? 12.5% of the original quantity What is the most commonly used shielding material in medical imaging? Lead What led thickness equivalence is required for protective lead aprons designated for general radiography, surgery, and fluoroscopy? 0.50 mm lead (Pb) Do use of leaded glasses is recommended for occupational use in medical imaging in order to prevent which of the following conditions Radiation induced cataracts What lead thickness equivalence is required for protective glasses? 0.35 mm lead (Pb) What lead thickness equivalence is required for protective lead gloves? 0.25 mm lead (Pb)

Low energy photons What is the primary patient does measurement influenced by filtration Entrance skin dose (ESD) Increasing the thickness of filtration has what effect on the patient's entrance skin dose? Assume no other technical factors are changed Decreased ESD What is the most commonly used filtration material in diagnostic radiography? Aluminum How does increasing filtration thickness affect the quality of the x-ray beam Increased quality How does decreasing filtration thickness affect the quality of the x-ray beam? Decreased quality How does increasing filtration thickness affect the quantity of the x-ray beam? Decreased quantity The following illustration represents the energy spectrum of an unfiltered x-ray beam. What portion of the spectrum is most affected by the addition of aluminum filtration? A How does decreasing filtration thickness affect the quantity of the x-ray beam Increase quantity Which of the following is a form of an added filtration commonly included in the x-ray tube assembly Aluminum plates Which three of the following are included in the total filtration of the x-ray beam?

  • insulating oil
  • Glass envelope
  • Aluminum plates What units are used to measure the total filtration of the x-ray beam? Millimeters (mm) aluminum equivalence (Al eq.) The thickness of inherent filtration within general use x-ray tube assemblies is equal to approximately 0.5 mm aluminum equivalence.

The thickness of added filtration within general use x-ray tube assemblies is equal to approximately 2 mm aluminum equivalence What is the minimum total filtration equivalence recommended by the national Council on radiation protection and measurements (NCRP) in report 1024 x-ray machines operating above 70 kVp? 2.5 mm aluminum equivalence. What term describes the thickness of a material that reduces the x-ray beam quantity by half Half value layer How is the x-ray beam changed by the addition of 1 half value layer of aluminum 50% decrease in quantity Which of the following beam energies requires the thickest half value layer 110 kVp What is the intensity of an x-ray beam created with one 2 value layer of filtration if the unfiltered intensity is 100 mGy? 50 mGy What term describes the thickness of a material that reduces the x-ray beam quantity by half? Half value layer How is the x-ray beam changed by the addition of 1 half value layer 50% decrease in quantity What is the intensity of an x-ray beam created with one HVL filtration if the unfiltered intensity is 50 mGy? 25 mGy The intensity of an x-ray beam created with one HVL of filtration resulted in an intensity of 75 mGy. What is the expected intensity of the beam of the filtration is removed 150 mGy HVL is a way of measuring what aspect of the x-ray beam Beam energy An increase in the measured half value layer of an x-ray tube indicates which of the following