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Ch 4 Rad Protection

Radiation Monitoring

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