Dosimeter Comparison Chart
Attribute Alanine Tape Tab Dosimeter Red Perspex 4032 Dosimeter
Dosimeter Description Alanine pellets containing alanine.

For Tape Tab: Pellet is placed into a film package with a bar code, allowing full traceability of the dosimeter.

 Polymethylmethacrylate (PMMA) moulded sheets cut to size and hermetically sealed in a film package containing a barcode. Dosimeter must be removed from it’s packing to use.;
Dosimeter Dimensions Alanine Pellet Dimensions

  • Diameter: 4.8mm +/- 0.1mm
  • Height: 2.8mm +/- 0.1mm
  • Batch Mass: Typically 60mg +/- 2mg
  • Lot Mass: +/- 0.6mg within a lot (standard deviation 0.3mg)

 

Tape Tab Dimensions

  • Width: 8.85mm +/- 0.25mm
  • Tail Length: < 7.5mm
  • Length: 150.00mm  +/- 5.0mm
  • Thickness: 0.50mm +/- 0.05mm (including the label)
  • Barcode start: 44.5mm +/- 2.5mm (from base of pellet)
  • Pellet Cup Diameter: < 5.0mm
  • Pellet Cup Depth: <3.5mm
  • Length: 3.0mm +/-
  • Width: 1.1mm +/-
  • Thickness: 3.0mm +/- 0.55mm

 
Dosimeter Response For Loose Pellets: Use a holder to insert the alanine dosimeter into a spectrometer.

For Tape Tab: Dosimeter contains crystalline alanine and registers the absorbed dose by the formation of alanine-derived free radicals.

 

 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.

 
Measurement Instrumentation Identification and measurement of the alanine-derived free radicals are performed by Electron Paramagnetic Resonance (EPR) spectrometer.

 

 Spectrophotometer Micrometer

 
Dosimeter Measurement Process Insert alanine dosimeter into spectrometer, system automatically transfers dosimeter bar code into software and begins taking measurement, dose calculated.

 

 Users remove dosimeter from packet. Place dosimeters into holder. 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, dose calculated.
Influence Quantities Temperature, pellet mass

 

 Temperature, humidity, dose rate, post-irradiation response

 
Typical Dosimeter System Uncertainty ± 4%

 

 ± 6%

 
Typical Dose Range 0.01-100 kGy

(0.01kGy to 100kGy may also be achieved)

 

 5-50 kGy

 

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