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?

Measurements of x-ray penetration through walls Signup and view all the answers

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

Pointing x-ray beams through corridors Signup and view all the answers

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

Every 6 months Signup and view all the answers

Which radiographic technique is least effective in reducing dose exposure?

Using lead aprons Signup and view all the answers

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

Thyroid is a radio-sensitive area. Signup and view all the answers

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

Take the minimum number of images necessary. Signup and view all the answers

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

Using proper lead aprons. Signup and view all the answers

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

To reassure patients and limit exposure to pelvic regions Signup and view all the answers

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

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

Which device is NOT typically used to measure radiation dose?

Lead apron Signup and view all the answers

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

Report all potential incidents immediately Signup and view all the answers

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

To understand the risks associated with X-ray exposure Signup and view all the answers

What is the current annual dose limit for classified individuals?

20mSv Signup and view all the answers

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

Equipment Signup and view all the answers

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

To remove low-energy photons 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?

Rare-earth intensifying screens Signup and view all the answers

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

To identify patients who will benefit from specific techniques Signup and view all the answers

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

200mm Signup and view all the answers

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

Using adjustable kV and exposure times 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?

Increased sensitivity leading to shorter exposure times Signup and view all the answers

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

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

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

Ionising Radiation Regulations of 1999 Signup and view all the answers

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

All exposures should be kept to the minimum necessary Signup and view all the answers

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

Referrers Signup and view all the answers

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

The expected yield of diagnostic information 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.