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Chapter 5 & 6 Test
|8 Factors that determine radiation injury
|Total dose, Dose rate, total volume irradiated, Species, Individual sensitivity, Cell sensitivity, Tissue sensitivity, Age
|What does total dose depend on?
|Type, energy, and duration. The greater the dose the more severe the biological effect.
|Three most sensitive tissues
|Blood forming organs, reproductive organs, and lens of the eye.
|True or False- Humans are the most radiosensitive species?
|Most sensitive cell
|What happens at 50R 150R 250R 450R 600R
|50R- blood changes 150R- nausea 250R- male gonads become temporary sterile. 450R- 50% death 600R- death to whole body.
|Collimation does what to the x-ray beam?
|Controls the size and shape of a useful beam with the lead diagram Reduces scatter and secondary radiation.
|F Speed Film
|Faster, large crystals, less clear, less radiation
|D Speed Film
|Slower, smaller crystals, more clear
|How is TOTAL filtration calculated?
|Inherent filtration+added filtration=TOTAL
|Ideal distance for the operator to stand away from the primary beam?
|Can we measure absorbed dose?
|What two doses can we measure?
|Entrance (skin dose) and exit dose.
|Maximum Permissible Dose for Health care providers.
|50 mSv/ year 1 mSv/ week
|Maximum Permissible Dose for general public?
|5 mSv/ year
|What does DXTTR stand for?
|Dental X-ray Technician Training Replica
|X-ray photons collide with important cell chemicals and break them apart by ionization. 1/3 of biological alterations from x-radiation exposure result from a direct effect.
|Radiation can cause chemical damage to the cell by ionizing the water within it.
|Descending Order of radio sensitivity
|Leukocytes, erythrocytes, immature reproductive cells, epithelial cells, endothelial cells, connective tissue cells, bone cells, nerve cells, brain cells, muscle cells.
|changes to genetic cells, that effect the offspring and future generations, but not the irraidiated individual.
|Sequence of events after radiation exposure
|Latent period, period of injury, recovery period.
|When the severity of the change is dependent on the dose.