38 Questions
Which of the following areas should be vacated when the machine is in use?
Supervised area and Controlled area
What is the purpose of signage and lights in an x-ray room?
To indicate the room should not be entered
Which of the following is NOT a way to reduce the need for repeat exposures during an x-ray?
Increasing the radiation dose
According to the inverse square law, what happens to the exposure when the distance is doubled?
The exposure quarters
Which of the following is NOT a recommended way to reduce exposure to radiation?
Using rubber gloves
When do the protection measures become problematic?
During linear accelerator use
Why must heavily sedated patients be precautioned during imaging?
To ensure they remain still
What should not be used near an MRI scanner?
Ferrous metal
What type of patients require head rests or cages during imaging?
Heavily sedated patients
Which form of electro-magnetic radiation is considered 'ionising radiation' and can affect your DNA?
X-rays
What is the major problem associated with X-rays and Gamma Rays?
They can ionise atoms
What does ALARP stand for?
As Low as Reasonably Practicable
What is the purpose of dosimetry in radiation protection?
To monitor radiation exposure
Which of the following is NOT a practical measure for protection against ionising radiation?
Wearing a lead apron
What is the purpose of having a controlled area with signage and warning lights in radiation protection?
To prevent entry when active
What is the main reason why it is difficult to determine the dangerous amount of radiation?
The complexity of monitoring exposure
What are the legal requirements for working with ionising radiation?
Having a controlled area with signage and warning lights
What is the purpose of shielding in radiation protection?
To enhance the effectiveness of radiation protection
What is the potential danger of X-rays and Gamma Rays?
They are 'ionising radiation' and can affect any atom including your DNA, which can lead to cancer development.
Why is it difficult to determine the dangerous amount of radiation?
There are a lot of atoms in the body and fail safes for managing DNA that goes 'rogue'. Additionally, cosmic rays are always hitting us and the effects of direct and subsequent radiation from events like Chernobyl are unclear.
What are the practical measures for protection against ionising radiation?
Monitoring through dosimetry and implementing the principle of ALARP (As Low as Reasonably Practicable).
What are some working practices that can help reduce exposure to radiation?
Using sedation or GA to minimize handling, increasing distance to the patient, and having a controlled area with signage and warning lights to prevent entry when active.
What are the legal requirements for working with ionising radiation?
Implementing the precautions of ALARP and following the working practices, amount of radiation used, distance from radiation source, and shielding.
What are some practical measures for protection against ionising radiation?
Collimation, centering, positioning, labelling, reducing artefacts so that repeat exposures aren't needed. Using previous settings for kV and mAs that gave good quality. Leaving the room and increasing distance. Using cassette holders for large animals. Wearing lead gowns, gloves, and thyroid protectors. Using portable shields. Having lead lined walls and doors.
What are some considerations for protection measures when working with large animals?
When working with heavily sedated patients, precautions such as head rests or cages are needed to hold them in place. The patients must be sedated to ensure they remain still during imaging. Additionally, when using an MRI scanner, ferrous metals should not be used nearby and MRI compatible devices are necessary.
What is the purpose of a controlled area with signage and warning lights?
The purpose of a controlled area with signage and warning lights is to indicate that the room should not be entered when the machine is in use. It is a safety measure to protect individuals from unnecessary exposure to radiation.
What is the relationship between distance and exposure according to the inverse square law?
According to the inverse square law, when the distance is doubled, the exposure is quartered. This means that as the distance from the source of radiation increases, the exposure decreases exponentially.
What is the role of shielding in radiation protection?
The role of shielding in radiation protection is to absorb and block the radiation. Lead is commonly used as a shielding material because it is dense and effective at absorbing radiation. Lead gowns, gloves, and thyroid protectors are examples of shielding devices.
True or false: X-rays and Gamma Rays are low frequency forms of electro-magnetic radiation.
False
True or false: X-rays and Gamma Rays are ionising radiation, which means they can ionise atoms.
True
True or false: X-rays and Gamma Rays can pass through substances like walls and human bodies easily.
True
True or false: The dangerous amount of radiation from cosmic rays, flying, or exposure to Radon is well understood.
False
True or false: Monitoring exposure to radiation is considered unnecessary because there is a safe dose limit.
False
True or false: The supervised area should be vacated when the machine is in use.
True
True or false: Lead gowns, gloves, and thyroid protectors are not recommended for primary beam protection.
True
True or false: Portable shields are designed to protect against scatter radiation.
True
True or false: Leaving the room with lead-lined walls and doors is an effective way to reduce exposure to radiation.
True
True or false: MRI scanners use a strong magnetic field and therefore, ferrous metals should not be used nearby.
True
Test your knowledge on X-rays and Gamma Rays with this quiz! Learn about the dangers of ionising radiation and its impact on DNA. Discover how these high frequency electromagnetic waves can easily penetrate through various substances. Challenge yourself and explore the world of X-rays and Gamma Rays!
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