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Ch 4 Rad Protection
Radiation Monitoring
| Question | Answer |
|---|---|
| Personnel monitoring ensures | That occupational radiation exposure levels are kept well below the annual effective dose limit |
| Personnel monitoring is required when radiation workers are likley to risk recieving | 10% or more of the annual occupational EfD limit of 50mSv in any 1 year as a consequence of their work related activites |
| To keep radiation exposure ALARA, most health care facilities | issue dosimeter devices when personnel might recieve about 1% of the annual occupational EfD limit in any month, or aprox.5mSv |
| the working habbits and conditions of a diagnostic imaging personnel | can be assessed over a designated period of time thru the use of the personnel dosimeter |
| A radiation worker should wear a personnel monitor device where and why | at collar level during CR, DR, or conventional to aprox the max radiation dose to the thyroid and the head and neck |
| During high level radiation procedures, personnel should wear what and why | lead aprons with the dosimeter worn outside of the garment at collar level to provide a reading of the aprox equivalent dose to the thyroid and eyes |
| During CR, DR, or specials, 2 seperate personnel dosimeters may be worn: | a primary dosimeter worn outside the apron at collar level and a second dosimeter worn beneath the apron at wasit level to monitor the aprox equivalent dose to the lower body trunk |
| TLD | Thermoluminescent dosimeter ring badges are worn under certain conditions to monitor and determine equivalent dosse to the hands when they are near the primary beam |
| Four types of personnel monitoring devices exsist | film badges, optically stimulated luminenescence OSL dosimeters, pocket ionization chambers, and TLDs |
| the RSO | recieves and reviews personnel monitoring reports to assess compliance with ALARA guidelines |
| Monitoring reports list the | deep, eyes and shallow occupational exposure |
| Area monitoring can be accomplished thru | the use of radiation survey instruments |
| A Geiger Muller tube | will indicate only the presence or absence of radiation |
| Dosimeter system | can quantitatively indicate both cumulative radiation intensity and radiation intensity rates |
| Types of gas filled radiation survey instruments include | the ionization chamber type survery meter (cutie pie), the proportinal counter and the GM Detector |
| How do radiographic and fluoro units calibrate ionization chambers | the ionization chamber is connected to an electrometer thqaat can measure tiny electrical currents with high precision and accuracy |
| Personnel dosimetry | the monitoring of radiation exposure to any person occupationally exposed regularly to ionizing radiation |
| Personnel dosimeter | Provides an indication of the working habits and working conditions of diagnostic imaging personnel |
| Densitometer | measures optical density |
| Optical density | The intensity of light transmitted thru a given area of the dosimetry film and compares it with the intensity of light incident on the anterior side of the film |
| Characteristic curve | The amount of radiation to which the film was exposed to determined by locating the exposure value of a control film of a similar optical density on this curve |
| Control badge | serves as a basis for comparison with the remaining film badges after they have been returned to the monitoring company for processing |
| Pocket ionzing chamber | AKA pocket dosimeter; most sensative, least common used dosimeter; it looks like a fountain pen, but contains a thimble ionziation chamber that measures radiation exposure |
Created by:
rachelbeatty4
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