Study On The Dosimeter Of The Gamma-ray Radiation Dose Based On Several Fluorescers

Being applied widely of gamma-ray, the study of gamma-ray radiation dosimeter has never ceased. In this paper, several kinds of fluorescers as gamma-ray radiation dosimeter had been studied.First of all, alizarin red S(ARS) aqueous solution as gamma-ray radiation dosimeter was studied. Within the absorbed dose range for 0-1500 Gy, fluorescence intensity of ARS aqueous solution rised with the increase of the absorbed dose at the concentration of ARS aqueous solution in 5×10-4mol/L. According to the study of ultraviolet absorption spectrum of ARS aqueous solution and Gaussian computation, it could be concluded that fluorescence intensity of ARS aqueous solution rising with the increase of the absorbed dose was caused by the reducing of the fluorescence quenching of ARS aqueous solution, which was the result of the disrupting ARS intramolecular hydrogen bonding influenced by ? radiation to influence the transfer of the excited-state intramolecular proton. Through the reaserach of the relationship between the fluorescence intensity of ARS solution and the absorbed dose under the condition of phosphate buffer solution(pH4.01) as solvent and the stability of ARS aqueous solution before and after irradiation under dark or light, it could be concluded that the fluorescence intensity of ARS solution was influenced by the concentration of H+?OH- and ARS aqueous solution had better stability in dark at 0-5 days.Besides, ARS and benzene boric acid(PBA) mixed solution as gamma-ray radiation dosimeter was reaserach in this study. To obtain the combination constant of the ARS and PBA, the relationship between the fluorescence intensity of the mixed solution and the concentration of PBA in the mixed solution had been studied. Within the absorbed dose range for 0-593.3Gy, fluorescence intensity of ARS/PBA mixed aqueous solution declined with the increase of the absorbed dose at the concentration of ARS in 1×10-5mol/L, PBA in 3.6×10-3mol/L. The stability of the mixed solution was discussed at before and after irradiation. Repeating the experiments under the condition of phosphate buffer solution(pH7.4) as solvent and comparing with the results, the higher linrarity between fluorescence intensity and the absorbed dose and greater stability under light at buffer solution as solvent could be obtained.Finally, 4-(diphenylamino)phenylboronicacid(DPBA) and protocatechuic aldehyde(PCA) mixed solution as gamma-ray radiation dosimeter was studied. To obtain the combination constant of the DPBA and PCA, the relationship between the fluorescence intensity of the mixed solution and the concentration of PBA had been studied. Within the absorbed dose range for 890-3560 Gy, fluorescence intensity of DPBA/PCA mixed aqueous solution rised with the increase of the absorbed dose at the concentration of DPBA in 9×10-6mol/L, PCA in 3.5×10-4mol/L. The stability of the mixed solution was discussed at before and after irradiation under dark or light. Repeatting the experiments under the condition of phosphate buffer solution(pH7.4) as solvent and comparing with the results, the higher linrarity and the wider rage between fluorescence intensity and the absorbed dose and greater stability although unstability in higher absorbed dose under dark at buffer solution as solvent could be obtained.