RADPRO 1&2

24問 • 1年前

通報

問題一覧

concerned with providing occupational radiation protection dose to the public

Health Physics

scientist concerned with research and operational aspects of radiation safety

Health Physicist

Cardinal Principles of Radiation Protection KMI

- keep time of exposure as low as possible - maintain a large distance as possible between source of radiation - insert shielding material

______: This is called when the time of exposure should be kept to a minimum ______: to reduce motion blur, one shot ______: to reduce patient & personnel exposure, moving images

> Minimize Time > Radiography > Fluoroscopy

_____ _____ is inversely related to the distance between the source & the patient

Radiation dose

the intensity of radiation at a location is inversely proportional to the square of its distance

Inverse Square Law

what to do to greatly reduce the level of radiation exposure? composition (lead), protective apron 0.5 mm of ______, reduces occupational exposure to 25%

Use Shielding > Lead

thickness of absorber necessary to reduce radiation intensity to half its original value

Half Value Layer

thickness of absorber necessary to reduce radiation intensity to one-tenth its original value

Tenth Value Layer

contained within protective housing, reduces leakage radiation

Protective X-ray Tube Housing

condition of exposure, must positively indicate when x-ray tube is energized, kVp & mA indicators

Control Panel

collimators for special examination

Cones & Diaphragm

- They must be adjusted so that with any image receptor size in use and at all standard SIDs, - no longer required by continue to be part of the most radiographic imaging systems.

Positive Beam Limitation

Each radiographic tube should be provided with a mechanism Purpose is to ensure proper alignment of the x-ray beam & the IR

Beam Alignment

the output radiation intensity should be constant from one exposure to another. This is checked by making repeated radiation exposures through the same technique and observing the average variation in radiation intensity.

Reproducibility

When adjacent mA stations are used, for example, 100 mA and 200 mA, the exposure time is adjusted for constant mAs, the output radiation intensity should remain constant. When the exposure time remain constant, causing the mAs to increase in proportion to the increase in mA, radiation intensity should be proportional to mAs. Radiation Intensity: ___/____

Linearity > mR/mAs

_______: it is when RT may be in the exposure room during exposure, but only if protective apparel is worn ______ ______: fixed, not a long cord

Operator Shield > Exposure Control

These are parts of _______ ____: should be assigned ____: at least 2m from x-ray tube during exposure

Mobile X-ray Imaging System > Lead Apron > Exposure Switch

radiation from x-ray tube

Leakage Radiation

radiation from patient

Scatter Radiation

receives the image

Image Receptor

in charge of quality & contrast

kVp

in charge of quantity and density

mAs

What do you call this? and what is the minimum? at least mm Al when above 70 kVp at least mm Al when 50-70 kVp at least mm Al when below 50 kVp

Filtration 2.5mm Al 1.5mm Al 0.5mm Al

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