On a radiochromic dye dosemeter

Radiochromic dye dose meters made of polyvinyl butyral (PVB) with hexa(hydroxyethyl)pararosaniline cyanide (HPR-CN) as the radiation-sensitive element are being developed and investigated at Risø. This report summarizes the present results and outlines plans for further research on this dose meter. Currently the response is found to be almost stable after irradiation, but recalibr?tion of a given batch is needed every 3-6 months because of changes in response characteristics with age.

Under typical laboratory conditions, the temperature coefficient is found to be about +1X per degree Celcius and the relative humidity coefficient +(0.4-0.5)X per percent change in relative humidity. The response drops ~ 15% when the dose rate is lowered from 1.1 Gy/sec to 0.2 Gy/sec. This research is supported by IAEA through research contract No. 2051/RB, and this report constitutes the progress report for the period November 1979 - October 1980.