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.
of Dosimeter: radiochromic optical waveguide
FWT-70-40M: 0.01-1 kGy FWT-70-83M: 0.1-20 kGy
Up Time: Typically within 1 hour
unirradiated: clear; irradiated: blue
to read dosimeters: 600 nm and 656 nm
Will color when exposed to wavelengths less than 350 nm.
Typically >2 years
Temp: 4 ºC
Size: 3 mm
dia x 5 cm long
dia x 2" long Detector Holders and FWT-87C Spare Caps for the
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