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Response Graph


FWT-70 series of Opti-Chromic Dosimeters are designed for low level radiation processing. They are small optical waveguides that gradually changes from clear to deep blue in relation to absorbed dose. The sensitivity ranges from 10 Gy to 20 kGy depending on the model.
The dye is derived from the family of aminotriphenyl-methane. These dyes can be made radiochromic: that is they will change from colorless to a deeply colored state as a function of absorbed dose. The FWT-70 series of dosimeters use hexa(hydroxyethyl) aminotriphenylacetonitrile (HHEVC) dye inside an optical waveguide. Readout of the dosimeters is by photometric means using dual wavelength photometry.

Type of Dosimeter: radiochromic optical waveguide
Trade name: Opti-Chromic Dosimeter
Dose Range: FWT-70-40M: 0.01-10 kGy FWT-70-83M: 0.1-20 kGy
Color Build Up Time: Typically within 1 hour
Color Change: unirradiated: clear; irradiated: blue
Wavelength to read dosimeters: 600 nm and 656 nm
UV Sensitivity: Will color when exposed to wavelengths less than 350 nm.
Shelf Life: Typically >2 years
Optimal Storage Temp: 4 ºC
Size: 3 mm dia x 5 cm long

Ordering Information
FWT-70-40M, 50 pieces/box
FWT-70-83M, 50 pieces/box

FWT-87 1/2" dia x 2" long Detector Holders and FWT-87C Spare Caps for the holders

Typical Characteristics
Graphs of radiation response for FWT Opti-Chromic Dosimeters

Typical response of FWT-70-40M Dosimeters at 600 nm and 656 nm

Typical response of FWT-70-83M Dosimeters at 600 nm and 656 nm

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Specifications subject to change without notice.
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