|ATTRIBUTE||ALANINE DOSIMETRY SYSTEM||RED 4034 DOSIMETRY SYSTEM|
|Instrumentation||Electron paramagnetic resonance (EPR) spectrometer||SpectrophotometerMicrometer|
|Dosimeter Description||Alanine substrate pressed into pellet shape with wax for binding material. Pellet is placed into a film package with a bar code that cannot be separated from the film package.||Polymethylmethacrylate (PMMA) molded sheets cut into ~ 3.0×1.1×0.55 mm pieces. Hermetically sealed in a film package.|
|Dosimeter contains crystalline alanine and registers the absorbed dose by the formation of alanine-derived free radicals. Identification and measurement of the alanine-derived free radicals are performed by EPR spectroscopy.ISO/ASTM 51607 Standard Practice for Use of an Alanine-EPR Dosimetry System||Induction of chemical reactions resulting from irradiation, which create absorption bands in the visible and/or UV regions of the spectrum. Optical absorbance is determined at appropriate wavelengths within these radiation-induced absorption bands and is quantitatively related to absorbed dose.ISO/ASTM 51276 Standard Practice for Use of a Polymethylmethacrylate Dosimetry System|
|Dosimeter Measurement Process||Insert alanine dosimeter into spectrometer, system automatically transfers dosimeter bar code into software and begins taking measurementDose calculated||Users remove dosimeter from packetPlace dosimeters into holder that holds 8 dosimeters
Place holder into spectrophotometer and absorbance transferred into software
Remove dosimeters from holder and read thickness of dosimeters, one at a time
Thickness automatically transferred into software
|Temperature, pellet massISO/ASTM 51607 Standard Practice for Use of an Alanine-EPR Dosimetry System||Temperature, humidity, dose rate, post-irradiation responseISO/ASTM 51276 Standard Practice for Use of a Polymethylmethacrylate Dosimetry System|
|Typical Dosimeter System Uncertainty
|± 4%ISO/ASTM 51607 Standard Practice for Use of an Alanine-EPR Dosimetry System||± 6%ISO/ASTM 51276 Standard Practice for Use of a Polymethylmethacrylate Dosimetry System|
|Typical Dose Range||0.5-150 kGy||5-50 kGy|
1 Influence quantities are compensated for by either the user or the dosimeter manufacturer.
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