Control Of Radiation Exposure By Time, Distance, And Shielding Flashcards
Methods of controlling internal radiation
Avoid Inhlation
Avoid ingestion
Avoid Absorption
Wound Decontamination
What is ALARA?
As Low As Reasonably Achievable.
What are the basic methods for controlling external radiation exposure?
- Minimize Time
- Increase Distance
- Ulitlize Shielding
What is a half value layer?
The thickness of the material required to reduce to 1/2 of it’s original value
What is the tenth value?
Thickness of material required to reduce radiation to 1/10 it’s original value.
What is the 10th value for Lead, Steel and water?
2 inches, 4 inches, 24 inches.
How do you caluclate radiation exposure?
Exposure = Intensity * Time
Point Source formula
I1r1^2 =I2r2^2
Line source formula
i1r1= i2r2
What are some examples of time employed in a medical setting?
- Have a through understanding of the task at hand.
- Practice with non-radioactive sources before handling Radio-pharmaceuticals.
- Reduce the amount of time around patients that have been injected with radio-pharmaceuticals.
What are some examples of time employed in a Nuclear setting?
- Plan the job
- Pre-job/pre-shift briefings
- Perform mock-up trainings
What are some examples of time employed in a radiography setting?
- Properly stage for work
- Leave Radiation areas during work delays
- Don’t stand near a radiography source or camera any longer than required.
What are some examples of distance employed in a medical setting?
Stand as far as possible during x-ray procedures.
* Use tongs or other handling devices.
What are some examples of distance employed in a nuclear setting?
- Move the component being worked on
- Use Remote Equipment
- Work at arm’s length from source
- Adjust work position at the job site.
- Move to area with lower background radiation
What are some examples of distance employed in a Radiography setting?
Stay as far as away from the source as practical.
