Optoelectronic reader for CET dosimeter, a radiation accident chemical dosimetry system

The use of chlorobenzene–ethanol–trimethylpentane solution (CET) in radiation dosimetry is based on radiolytic formation of hydrochloric acid which protonates a pH indicator, thymolsulphonphthalein. The high molar absorptivity of its red form at 552 nm is responsible for a high sensitivity of the sy...

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Bibliographic Details
Published inRadiation physics and chemistry (Oxford, England : 1993) Vol. 68; no. 6; pp. 1005 - 1010
Main Authors Ilijaš, Boris, Ražem, Dušan, Miljanić, Saveta, Cerovac, Zdravko, Orehovec, Zvonimir
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2003
Subjects
Chlorobenzene
Optoelectronic reader
Radiation accident chemical dosimetry
Chlorobenzene
Radiation accident chemical dosimetry
Optoelectronic reader
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Summary:The use of chlorobenzene–ethanol–trimethylpentane solution (CET) in radiation dosimetry is based on radiolytic formation of hydrochloric acid which protonates a pH indicator, thymolsulphonphthalein. The high molar absorptivity of its red form at 552 nm is responsible for a high sensitivity of the system: doses in the range 0.2–15 Gy can be measured. Together with a visual colour comparator it has formed a personnel dosimetry system suitable for accident and civil defense use. A newly constructed optoelectronic reader with two two-colour light emitting diodes (550 and 690 nm) as light sources and a silicone photocell as a detector uses the differential absorbance at these two wavelengths as the response. The response is a direct function of dose and can be recorded and processed electronically.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2003.08.008