A rapid method for determining 90Sr in leaching solution from cement solidification of low and intermediate level radioactive wastes

Liquid scintillation counting for determination of radionuclides in environmental and nuclear application

“…An obvious discrepancy was observed between the measured TDCR value and the counting efficiency of 55 Fe. Therefore, a quench correction needs to be conducted by fitting with a quench calibration curve, especially for the solution with high color quench due to the ferric ion in HCl or water solution.…”

“…For electron capture nuclides, such as 55 Fe, 41 Ca and 139 Ce, there can be more than one counting efficiencies corresponding to a given TDCR value, as the decay spectra are not continuous due to the contribution of two or more separated group of scintillation energy from conversion electrons and gammas. Thus, the introduction of a new parameter into the algorithm of counting efficiency determination would be required to yield a singlevalued efficiency vs. TDCR curve [46].…”

“…Thus, the introduction of a new parameter into the algorithm of counting efficiency determination would be required to yield a singlevalued efficiency vs. TDCR curve [46]. Hidex TDCR LSA has been used for the measurement of 55 Fe in radioactive waste, irradiated steel and urine samples [4,[47][48]].…”

“…Therefore, a quench correction needs to be conducted by fitting with a quench calibration curve, especially for the solution with high color quench due to the ferric ion in HCl or water solution. By obtaining a simple power function of counting efficiency vs. the TDCR value with a set of quench standards, satisfactory results of quench correction for 55 Fe has been achieved [47]. To reduce the color quench in the measurement of 55 Fe, H3PO4 can be used to dissolve the separated iron in precipitate, a colorless solution can be obtained by formation of an iron complex with H3PO4 [12].…”

“…The determination of radionuclides using plastic scintillation resin and conventional LSC instrument has being proposed and shown a promising application, especially for the rapid analysis, which can avoid the utilization of the organic scintillator, therefore reduce the organic radioactive waste [5][6][7][8]. In the past years, an increased Journal of Radioanalytical and Nuclear Chemistry 4 application of LSC occurred in the measurement of radionuclides for decommissioning of nuclear facilities, such as 36 Cl, 41 Ca, 55 Fe, 63 Ni, 93 Zr, 99 Tc and 129 I [9][10][11][12][13][14][15][16]. The LSC has also shown a competitive application in the rapid analysis of radionuclides for emergency preparedness and homeland security purposes due to its relative short measurement time and simple target preparation [17][18][19][20].…”