Radiation dosimeter FTR-125

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Overview
Accurate film dosimeter designed for routine dosimetry in radiation processing, materials testing and R&D, compatible with electron beam, gamma-ray and ion beam irradiations.

Cellulose Triacetate (CTA) Dosimeter
The CTA film dosimeter FTR-125 increases optical density proportionally to absorbed dose. Its thin tape form enables high-resolution mapping of surface and depth-dose distributions on irradiated samples.

Characteristics

• Linear dose response
• Simple measurement procedure
• High spatial resolution
• Suitable for ion beam dosimetry

Features
FTR-125 is developed for quality control and routine measurements when using radionuclide and accelerator sources. The film’s linear optical-density versus dose behavior across electrons, gamma-rays and ions facilitates reliable dose verification and distribution analysis.

Method of Measurement
Absorbed dose is determined from the increase in optical density at 280 nm induced by radiation. Measurements can be performed with standard UV–Vis spectrophotometers; a dedicated CTA dose reader is also commercially available.

Dose Responses
Published dose-response curves (see downloadable PDF) show linear response for 2 MeV electrons, 15 MeV protons and 30 MeV helium ions. Sensitivity reduction at high LET is observed; temperature and humidity effects are negligible at typical high dose rates used for electron irradiation.

Specifications
Film thickness
125 µm (~15 mg/cm2)
Dimension
width: 8 mm; length: 100 m/reel
Composition
cellulose triacetate; triphenyl phosphate
Analyzing wavelength
280 nm
Usable dose range
5 kGy – 300 kGy

Technical specifications

• Film thickness: 125 µm (~15 mg/cm2)
• Dimension: width 8 mm; length 100 m per reel
• Composition: cellulose triacetate; triphenyl phosphate
• Analyzing wavelength: 280 nm
• Usable dose range: 5 kGy – 300 kGy