Radiation Shielding & Protection
This type of protective barrier is designed to absorb the direct X-ray beam and must be the thickest.
What is a primary barrier?
This device ensures the X-ray beam and light field are properly aligned, preventing unnecessary exposure.
What is a collimator?
This type of radiation monitoring device is commonly worn by radiologic technologists to measure their occupational exposure.
What is a dosimeter?
This safety feature ensures that the X-ray beam automatically limits its size to match the image receptor in fluoroscopy.
What is positive beam limitation (PBL)?
This organization sets occupational radiation exposure limits and safety guidelines in the United States.
What is the National Council on Radiation Protection and Measurements (NCRP)?
hese two types of secondary radiation must be considered when designing radiation protective barriers.
What are scatter and leakage radiation?
This protective feature in fluoroscopy automatically covers a gap at the end of the table to reduce gonadal exposure.
What is the Bucky slot cover?
This type of dosimeter uses aluminum oxide (Al₂O₃) as the radiation detector and is stimulated by laser light.
What is an optically stimulated luminescence (OSL) dosimeter?
In stationary fluoroscopy, the minimum source-to-skin distance (SSD) must be at least this value.
What is 38 cm?
The maximum annual occupational radiation dose limit for radiologic technologists is this amount.
What is 50 mSv (5,000 mrem)?
his factor, represented as "U," determines how often a radiation beam is directed at a specific protective barrier
What is the use factor?
This fluoroscopy safety feature stops radiation exposure immediately when pressure is released from the control switch.
What is the dead man switch?
his radiation detection device works by ionizing gas within a chamber, generating an electrical signal proportional to the radiation intensity.
What is a gas-filled detector?
This term refers to the total amount of radiation a patient receives during a fluoroscopic procedure, taking into account both dose and beam area.
What is dose area product (DAP)?
he dose limit for the general public in an uncontrolled area is set at this level per week.
What is 20 µSv (2 mrem)?
In an uncontrolled area, the maximum annual dose limit for the public is set at this level.
What is 1 mSv per year (100 mrem per year)?
The minimum total filtration required for an X-ray beam operating above 70 kVp is this value.
What is 2.5 mm aluminum (Al) equivalent?
This type of detector is used in nuclear medicine and CT imaging systems, emitting light when exposed to radiation.
What is a scintillation detector?
This lead-equivalent protective feature is placed between the patient and the fluoroscopist to reduce radiation exposure to personnel.
What is the protective curtain?
An area occupied primarily by radiation workers, where stricter exposure limits apply, is classified as this.
What is a controlled area?
List three materials commonly used in the construction of radiation protective barriers.
What are lead, concrete, and steel?
This fluoroscopic protective feature tracks the amount of time the X-ray beam has been active and provides an audible signal at 5 minutes
What is the cumulative timer?
This type of dosimeter stores radiation energy in its material and emits visible light when heated
What is a thermoluminescent dosimeter (TLD)?
This equation is used to calculate the total radiation exposure by multiplying radiation dose by the beam area (state the equation)
What is Dose Area Product (DAP) = Radiation Dose × Beam Area?
This term describes the amount of radiation a technologist receives based on tissue sensitivity and is used to assess occupational exposure risk.
What is effective dose?