TCDHA Rad Theory - Week 1&2
thyroid collar - Answer- flexible lead shield
-protect the thyroid gland from scatter radiation.
lead apron - Answer- a flexible lead shield
-to protect the patients reproductive and blood forming tissues from scatter radiation
inherent filtration - Answer- p...
TCDHA Rad Theory - Week 1&2
thyroid collar - Answer- flexible lead shield
-protect the thyroid gland from scatter radiation.
lead apron - Answer- a flexible lead shield
-to protect the patients reproductive and blood forming tissues from scatter radiation
inherent filtration - Answer- primary beam passes through glass window, oil bars and
tube head
- 0.5 to 1.0mm aluminum
added filtration - Answer- FILTERS OUT LONG WAVELENGTHS W LOW ENERGY
AND SOFT RADIATION
aluminum discs in the path of X-ray beam
total filtration= -1.5mm below 70kVp
-2.5mm above 70 kVp
collimator - Answer- restricts size and shape of X-ray beam
circular- beam= 2.75in d
rectangular- exposes 60% less tissue
primary radiation - Answer- -useful beam
penetrating xray beam that exits tube head
secondary radiation - Answer- created when the primary beam interacts with matter
Scatter radiation - Answer- A form of secondary radiation
-when an x-ray beam has been deflected from its path by interaction with matter
insight film (F-speed) - Answer- -fastest intraoral film
-20% reduction on exposure over E-speed
-film holding devices are used
-limits x radiation received
radiographer protection - Answer- -stand 6ft away at 90-135 degree angle to X-ray
beam
leakage radiation - Answer- radiation that emits from tube head
-excluding primary beam
what is maximum permissable dose (MPD)? - Answer- dose you can receive in a
specific period of time
, -radiation the body can endure with little/no injury
MPD for occupationally exposed - Answer- 5.0 rem/year (0.05Sv/year)
MPD for non-occupationally exposed persons - Answer- 0.1 rem/year
(0.001Sv/year)
Maximum Accumulated Dose (MAD) - Answer- Occupationally exposed workers
must not exceed an accumulated lifetime radiation dose
-determined by persons age
-18 = minimum age in order to work with radiation
formula of MAD - Answer- MAD = (N - 18) X 5 rem / year
MAD = (N - 18) X 0.05 Sv / year
N = individual's age in years
ALARA - Answer- As Low As Reasonably Achievable
CODE 30 - Answer- Radiation Protection in Dentistry
Radiation Responsibility and Personnel
Radiation Facility Requirements
Radiation Equipment Specifications
Film Processing and Handling
Quality Assurance Programs
Procedures to reduce radiation exposure to personnel
Procedures for minimizing radiation exposure to clients
HARP - Answer- Healing Arts Radiation Protection Act
-regulates the use of x-ray machines, training necessary for individuals working with
the machine and safety information
tubehead - Answer- contains the x-ray tube that produces dental x-rays
extension arm - Answer- suspends the x-ray tube head- houses the electrical wires,
- allows for movement and positioning of the tubehead
control panel - Answer- regulates X-ray beam
-contains on/off switch and exposure button and control devices
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