Performance test of automatic analysis system of Strontium-90 in environmental sample

An automatic analysis system was developed to analyze ⁹⁰Sr radioactivity in environmental sample. The analysis method was followed to the manual compiled by the Ministry of Education, Culture, Sports, Science and Technology. In this research, the procedure of the Sr analysis before milking procedure of ⁹⁰Y was separated to three groups such as 1) wet decomposition, 2) chemical separation, and 3) ion exchange. The system needed to be improved in each group after the previous paper. In the wet deposition system, a heating program of hot plate was separated to two steps from one step to prevent bumping. Moreover, air spraying nozzle was added to the system. Next, stirring function of stirrer was added to the chemical separation system to make a distribution solution uniform. Finally, liquid surface detecting system was added to the ion exchange system. The improved analysis system was used in ⁹⁰Sr concentration measurement in seaweed sample. The obtained concentration was consistent with the concentration analyzed by worker. Therefore, the automatic analysis system was improved to analyze ⁹⁰Sr in an ashed environmental sample, successfully. (author)