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Terms in this set (192)
Gray The SI unit of the absorbed dose is the:
Relative biological Is a term used to compare the effects of radiation
effectiveness on living systems:
80% What percentage of a cell is water?
What is the protective layer of the eyeball, or
Tunica Fibrosa
globe?
The lubricating effects of What is an orbital defense against infection?
blinking
Older, damaged cells of the corneal epithelium are
1-2 weeks shed from the eye during blinking or tearing. The
cells is this layer are repopulated how often?
1. Fiber cells contain What 3 things are true about the fiber cells of the
more cholesterol than lens?
any other than any other
cell in the human body.
2. Fiber cells produce
crystallin, a protein that
helps determine how well
the lens refracts light.
3. The loss of fiber cells
contributes to the
formation of cataracts.
, Which structures trigger aversion reflexes when
Neuron ganglia
potentially dangerous intense light hits the retina?
Photoreceptor What is the process by which rod and cone cells
Transduction transform light energy into nerve impulses?
1. The severity of damage to tissue is dose
What are characteristics
dependent.
of deterministic radiation
2. A dose threshold exists such that the probability
effects?
of damage from low doses is negligible.
True or false: radiation-induced cataracts can result
from a single high dose or from chronic low-dose
True exposure of the lens, which is why occupational
exposures over time represent a major concern for
fluoroscopy operators.
The as low as reasonably achievable (ALARA)
Linear no-threshold
principle is based on what model?
Children are up to how many times more sensitive to
10 tissue and DNA damage from ionizing radiation than
are adults?
The risk of any radiation-induced cancer from a
5% per Sv
single fluoroscopic exam is what percent per Sv?
According to the article, which cancer of the eyelid
Sebaceous Carcinoma has been linked to ionizing radiation and ultraviolet
sunlight?
Keratitis What is another name for corneal ulcers?
True or false: a single well-defined lower dose
False threshold has been established for radiation
cataracts.
According to the International Commision on
Radiological Protection, the annual limit for
20 mSv
occupational exposure to the eye lens is how many
mSv?