Abstract
To increase the sensitivity of dosimeter, it has to improve the properties that are required to increase its sensitivity. It was proven that the dependence of lyoluminscence (LL) of irradiated amino acid (L-prolin) incorporated with chemiluminscence reagent (luciginine) on the pH and temperature of the solution. LL means the emission of light from dissolved material in a suitable solvent, which is previously exposed to ionizing radiation. When the incorporated phosphor irradiated to gamma rays an electronically excited species are trapped within the solid matrix, this extra energy will be emitted in the form of light ( 420-500nm), on dissolving the material in water in this test. The LL intensity increases with increasing pH of the solution. The best reproducible and optimum LL intensity is at (pH=8.5-9) of the solution, However, LL intensity will be decreased when the PH is higher than 12. In this value of pH the stability of free radicals is optimum. The same is found for solvent temperature dependence, the optimum LL intensity is at 45-48 oC. LL intensity will increase up to 70 oC,it was found that the total glow increased because of increasing the self-glow of luciginine , but LL intensity will decrease because of dissociation of phisphore structure. In addition to the self-glow of the sanitizer will increase too at temperate up to 70 oC , however, that will cause self-glow to the dosimeter material.
Highlights
From historical point review, lyoluminscence (LL) of organic solids can be considered as a special case of chemiluminscence [1]
LL has been reported from gamma irradiated and electrolytic dyed alkali halide with water containing luminal as solvent; excess color centers lead to increase LL intensity [4]
It was concluded that amino acid (L-prolin) incorporated with chemiluminscence reagentis the best dosimeter for LL technique
Summary
Lyoluminscence (LL) of organic solids can be considered as a special case of chemiluminscence [1]. Lyoluminescencce yield depends on many parameters such as gamma dose, particle size of the sample, amount of the solute, amount of the solvent, pH value of the solvent, temperature of the surroundings, etc.[3] It is well-known that the phenomenon of luminescence shows the intensity depends on radiations. Figure-2 shows the time dependence of the LL intensity of γ-irradiated L-prolin incorporated with luciginin for different grain sizes (millimeters). Figure-3 shows the time dependence of the LL intensity for different pH of the solution for Lprolin incorporated of lucigenin. Separated from self-glow where the self-glow is a lumen without radiate, on different solvent temperature From the figure, it has seen LL intensity increases with increasing of solvent temperature, but after 45-48 oC self-glow of lucigenin become large, which makes a large uncertainty in measurements.
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