Diagnostic Imaging (Hgh) - Radiation Safety Quiz

The correct answer is "Time, Distance, and Shielding." This means that one of the general radiation safety practices to reduce dose is to minimize the time of exposure to radiation. Another practice is to increase the distance between the patient and the radiation source, such as the x-ray tube or image intensifier. Additionally, using shielding materials, such as lead aprons or barriers, can provide protection from radiation. These practices help to limit the amount of radiation that reaches the patient and healthcare workers, reducing the potential for harmful effects.

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The correct answer is to put the badges/dosimeters in the designated TLD badge holders in non-radiation areas. This ensures that the badges/dosimeters are stored in a secure and appropriate location after a shift, where they can be easily accessed and monitored. Storing them on the yellow isolation gown, on the lead apron, or taking them home each night is not the proper procedure and can lead to loss or damage of the badges/dosimeters. Taking them to a fishing derby is also not a suitable option as it can result in misplacement or improper use of the badges/dosimeters.

Collimation should always be used because it decreases patient exposure and reduces scatter to staff. Collimation refers to the process of restricting the size of the X-ray beam to only the area of interest, thereby minimizing unnecessary radiation exposure to the patient. By narrowing the X-ray beam, scatter radiation is also reduced, which further decreases the radiation dose to the staff. Therefore, using collimation is essential to ensure optimal image quality while minimizing radiation exposure to both the patient and the staff.

If you wear a dosimeter at both the Hamilton General and another facility, it is important to notify Dr. Gerald Moran so that he can monitor your combined exposure. This is crucial because Dr. Moran will be able to assess the total amount of radiation you are exposed to from both facilities and ensure that it is within safe limits. By informing Dr. Moran, he can take necessary measures to protect your health and well-being. Notifying security at the Hamilton General may not be sufficient as they may not have the expertise or authority to monitor your combined exposure.

The correct answer is that the larger the patient, the higher the technique that is needed, resulting in an increase in dose to both the patient and staff. This is because larger patients require more radiation to penetrate through their body and produce clear images. As a result, the staff needs to use higher levels of radiation to obtain accurate diagnostic information, which increases the radiation exposure to both the patient and the staff.

The dose equivalent annual limit for the whole body for a radiation worker is 50 mSv. This means that in a year, a radiation worker should not be exposed to more than 50 mSv of radiation. This limit is set to ensure the safety and health of the radiation worker, as exposure to higher levels of radiation can increase the risk of harmful effects such as cancer and other radiation-related illnesses.

The dose rate at 4 feet from a radiation source is four times that of the dose rate at 8 feet from the radiation source. This means that the radiation intensity decreases as the distance from the source increases. The inverse square law states that the intensity of radiation is inversely proportional to the square of the distance from the source. Therefore, if the dose rate is four times greater at 4 feet, it means that the intensity is four times greater at 4 feet compared to 8 feet.

The correct answer is A because when the Image Intensifier is away from the operator (diagram A), the scatter radiation has a longer distance to travel before reaching the operator's eyes. This results in a decrease in the dose of scatter radiation received by the operator's eyes compared to when the Image Intensifier is closer to the operator (diagram B).

The x-ray tube should be placed as far away from the patient as possible in order to minimize skin entrance dose rate to the patient. This is because the further the x-ray tube is from the patient, the greater the distance the radiation has to travel and the more it spreads out, reducing the dose received by the patient's skin. On the other hand, the image intensifier should be placed as close to the patient as possible in order to decrease the skin entrance exposure rate to the patient and reduce scatter radiation to the staff. This is because the image intensifier absorbs and converts the x-rays into a visible image, reducing the amount of radiation that reaches the patient's skin and the staff.

If TLD's (Thermoluminescent dosimeters) are returned late, the results may be overestimated since a control may not be subtracted and a late charge will be assessed if the badge is not returned on time. This means that if the TLD's are not turned in on time, there is a risk of inaccurate results and a financial penalty. Therefore, both options A and C are correct.

During pregnancy, it is important to limit the exposure of the abdomen to radiation to protect the developing fetus. The maximum permissible dose to the abdomen during the course of pregnancy is 5 mSv. This limit is set to minimize the risk of harmful effects on the fetus while still allowing for necessary medical procedures that may involve radiation. Exceeding this dose limit can increase the risk of birth defects and developmental problems in the unborn child. Therefore, it is crucial to adhere to this maximum permissible dose to ensure the safety of both the mother and the fetus.

Natural Background Radiation refers to the radiation that is present in the environment from natural sources such as cosmic rays, radon gas, and radioactive materials in the Earth's crust. It is a constant exposure that everyone experiences on a daily basis. The average annual dose of Natural Background Radiation is typically in the range of 3-5 mSv. This level of radiation is considered to be relatively low and does not pose a significant health risk to individuals.

The yearly maximum permissible dose to the skin for a radiation worker is 500 mSv. This means that a radiation worker can be exposed to a maximum dose of 500 mSv to their skin in a year without exceeding the safe limit. It is important for radiation workers to adhere to this limit to minimize the risk of harmful effects from radiation exposure.

The correct answer is "GI and portable c-arm procedures greater than 10 minutes and Angio/interventional procedures greater than 20 minutes." This means that for Fluoro Time reporting at the General, GI and portable c-arm procedures must be longer than 10 minutes, while Angio/interventional procedures must be longer than 20 minutes in order to be reported.

Dr. Ian Doris is our Radiation Protection Officer (RPO) at the General.

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If badges are not returned within 90 days of the end of the wear period, there is a charge of $15.96 each.

Keeping the image intensifier as close to the patient as possible is the best way to reduce patient and staff exposure. By keeping the image intensifier close to the patient, the amount of radiation needed to obtain a clear image is minimized. This reduces the overall exposure to both the patient and the staff.