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Definition
Created by the sudden deceleration of a stream of electrons
This produces both heat (99%) and x-ray photons (1%) |
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Term
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Definition
Designed to generate x-rays and deal with the heat production
Characteristically uses 30-150 kV to produce x-ray beam
The exposure switch is a 'deadman' swtich and must be held throughout exposure |
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Term
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Definition
Absorbed by the patient, while some of the photons are absorbed by the image receptor
However some of the x-ray photons are deflected by the patient and image receptor and become x-ray scatter (scatter radiation) |
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Term
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Definition
| Poses a threat to healthcare workers |
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| Factors determining the amount of scatter radiation |
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Definition
| Energy of the x-ray beam (kV), the size of the part being imaged and the duration of imaging |
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| Injury from exposure to ionizing radiation are possible |
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Definition
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Definition
| Causing cell death or tissue damage |
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Definition
| Development of cancer from direct DNA ionization or the creation of hydroxyl radicals from X-ray interactions with water molecules |
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Term
| Defining the exposure to radiation |
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Definition
Radiation absorbed dose (rad)
Radiation equivalent man (rem)
Roentgen (C/kg) |
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Definition
Rad and Rem
are Interchangable |
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| SI units of radiation exposure |
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Definition
Gray and Sievert replace rad and rem respectively
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Definition
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Definition
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Definition
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Definition
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Definition
Annual Dose Limit- 5 rem (50mSv)
Lifetime Accumulation- 1 rem x years of age |
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Term
| Highest Radiation Exposure |
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Definition
| Fluroscopy and CT imaging |
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Term
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Definition
| Humans from whole-body radiation exposure is approximately 400 rad |
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Term
| Organs with High Cell Replication |
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Definition
Most sensitive to effects or radiation exposure
GI epithelium, gonads, lens, thyroid &hemopoietic system |
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Term
| Cardinal Principles of Radiation Protection |
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Definition
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Term
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Definition
| Keep exposure time as short as possible (usually not in our control) |
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Definition
Maximize the distance from the radiation source
Radiation intensity declines with the squre of the distance (Inverse Square Law) |
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