LECTURE 6 ~~~~~~ NOTION
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Questions and Answers

What is a primary method for dose limitation in areas adjacent to x-ray rooms?

  • Point the x-ray beam towards open windows
  • Point the main x-ray beam through open doorways
  • Use lower energy x-ray beams
  • Never point the main x-ray beam through open doorways (correct)
  • Who is responsible for determining the necessary wall thickness for x-ray rooms?

  • Construction engineer
  • X-ray technician
  • Radiologist
  • Physicist (correct)
  • What may be required if the wall thickness is insufficient for radiation protection?

  • More x-ray machines
  • Increased distance between x-ray machine and walls
  • Shorter exposure times
  • Lead protection or protective screens (correct)
  • How is wall thickness related to x-ray dose limitation determined?

    <p>Measurements of x-ray penetration through walls</p> Signup and view all the answers

    Which of the following poses a risk for staff and patients if not managed correctly?

    <p>Pointing x-ray beams through corridors</p> Signup and view all the answers

    How often should radiographs be taken for patients at high risk?

    <p>Every 6 months</p> Signup and view all the answers

    Which radiographic technique is least effective in reducing dose exposure?

    <p>Using lead aprons</p> Signup and view all the answers

    What is one of the key reasons for using thyroid shields during dental radiography?

    <p>Thyroid is a radio-sensitive area.</p> Signup and view all the answers

    What is a recommended practice to enhance the quality of radiographic images?

    <p>Take the minimum number of images necessary.</p> Signup and view all the answers

    What is an appropriate measure for patient protection during dental radiography?

    <p>Using proper lead aprons.</p> Signup and view all the answers

    What is the purpose of using a lead apron during radiographs for pregnant patients?

    <p>To reassure patients and limit exposure to pelvic regions</p> Signup and view all the answers

    Which of the following is NOT a Golden Rule for radiation safety?

    <p>Hold the X-ray tube head during exposure if needed</p> Signup and view all the answers

    Which device is NOT typically used to measure radiation dose?

    <p>Lead apron</p> Signup and view all the answers

    What action must employees and students take regarding potential incidents of overexposure?

    <p>Report all potential incidents immediately</p> Signup and view all the answers

    What is a crucial responsibility of all staff engaged in radiography?

    <p>To understand the risks associated with X-ray exposure</p> Signup and view all the answers

    What is the current annual dose limit for classified individuals?

    <p>20mSv</p> Signup and view all the answers

    Which physical method of dose limitation involves the design and operational parameters of the imaging equipment?

    <p>Equipment</p> Signup and view all the answers

    Why is a 1.5mm aluminum filtration recommended in x-ray equipment?

    <p>To remove low-energy photons</p> Signup and view all the answers

    Which type of image receptor is known for requiring fewer photons to produce an image, resulting in a lower patient dose?

    <p>Rare-earth intensifying screens</p> Signup and view all the answers

    What is the main purpose of selection criteria in medical exposures?

    <p>To identify patients who will benefit from specific techniques</p> Signup and view all the answers

    What is the recommended focal spot distance (FSD) to reduce patient radiation exposure during x-rays?

    <p>200mm</p> Signup and view all the answers

    Which of the following recommendations aids in the optimization of radiation dose during x-ray imaging?

    <p>Using adjustable kV and exposure times</p> Signup and view all the answers

    What is an important benefit of using solid-state or phosphor plate digital image receptors in x-ray imaging?

    <p>Increased sensitivity leading to shorter exposure times</p> Signup and view all the answers

    What is the primary aim of preventing deterministic effects in radiation protection?

    <p>To reduce the likelihood of effects occurring above a certain threshold</p> Signup and view all the answers

    Which legislation is primarily concerned with worker safety in relation to ionising radiation?

    <p>Ionising Radiation Regulations of 1999</p> Signup and view all the answers

    In the context of radiation protection, what does the principle of optimisation entail?

    <p>All exposures should be kept to the minimum necessary</p> Signup and view all the answers

    What is one of the roles specified in the Ionising Radiation Medical Exposure Regulations 2000 (IRMER)?

    <p>Referrers</p> Signup and view all the answers

    Which factor should a clinician consider before deciding to take an x-ray?

    <p>The expected yield of diagnostic information</p> Signup and view all the answers

    Study Notes

    Methods of Dose Limitation for Waiting Room and Corridors

    • Never point main x-ray beam through open doorways into corridors/rooms.
    • Checking the thickness of walls. Maybe lead protection of barium plaster is needed. Or protective lead screens.

    Determining Wall Thickness

    • Physicist determines the amount of x-ray penetration through a wall.

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    Description

    This quiz covers important methods for limiting radiation exposure in waiting rooms and corridors. It includes guidelines for directing x-ray beams and determining wall thickness for effective radiation shielding. Test your knowledge on the safety measures necessary in medical environments.

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