The measurement of Sr-90 is important because of its half-life and environmental hazards, so research is very important in this regard. The purpose of this research is to review the measurement and determination techniques of Sr-90 radiation to the standard ISO-18589. Efforts are made to safely dispose of waste by following guidelines for determining the amount of radiation, ensuring that the environmental and health hazards of waste products do not exceed acceptable levels.
First, for characterization, the radioactive waste sample was analyzed using inductive plasma coupled spectroscopy, liquid scintillation, and gamma spectroscopy, and the concentrations and activities of the elements in the matrix were determined. In the following, parameters such as time, nitric acid concentration, and strontium concentration were evaluated, and the distribution coefficient of strontium was calculated by batch method. on the other hand, adsorption isotherms were also checked.
In the continuous method based on the ISO standard, first, the column containing Resin Sr was prepared. The sample was then loaded on the column. Strontium was selectively adsorbed in the column in an acidic medium and then washed with a elution and separated from other impurities such as barium and calcium. In order to measure the amount of radioactivity, the sample containing strontium-90 was measured with a liquid scintillation device after separation and removal of impurities. In order to determine the chemical yield, stable strontium was added to it with a specific concentration as a carrier. Based on this, the chemical efficiency was reported as 98.8%.