Hm. Khan et al., EFFECT OF TEMPERATURE AND LIGHT ON THE RESPONSE OF AN AQUEOUS COUMARIN DOSIMETER, Journal of radioanalytical and nuclear chemistry, 200(6), 1995, pp. 521-527
The aqueous solution of coumarin has been studied spectrophotometrical
ly as a gamma-ray dosimeter and effects of temperature and light condi
tions on the stability of response during post-irradiation storage hav
e been studied. Post-irradiation storage at room temperature in dark s
howed that after a very small increase in absorbance within the first
6 d, the response of the dosimeter was stable up to 42 d. At lower tem
perature (-15 degrees C), there was some decrease in absorbance within
the first 24 h followed by a stable response up to 35 d. For post-irr
adiation storage at higher temperatures (40, 60 degrees C) the dosimet
er, apart from some initial increase in absorbance, showed a nearly st
able response up to 25 d. The effect of different light conditions dur
ing post-irradiation storage has also been studied. When stored in flu
orescent light the response was almost stable from 6 d till about 40 d
. In diffuse sunlight, the response was stable up to about 35 d at 360
nm and 370 nm but showed a somewhat unstable behavior at 347 Nm. The
dosimetric solutions were unstable when exposed to direct sunlight.