The Effect of Pressure Drop on Purity of ~(32)P Products with Dry Distillation Process

摘要

Phosphorus is one of most produced radioisotopes at Center for Radioisotope and Radiopharmaceutical Technology - BATAN. This product is formed as phosphorus-32 (~(32)P) which is useful for industrial, agricultural, research and health field purposes. The radioisotope ~(32)P can be produced by extraction, dry distillation and precipitation method. In a dry distillation process of ~(32)P, a Sulphur which is after irradiated at Multipurpose Reactor G. A. Siwabessy is heated up until its melting and boiling point is achieved. This research was carried out in a radioisotope and radiopharmaceutical production laboratory, to find out how much pipe openings gas valve the nitrogen ultra-high purity (UHP), the proper airflow pattern, and the pressure drop to produce high purity ~(32)P radioisotope products. For this research, measurement and calculation conducted using valve opening degree variation at 0°, 30°, 45°, 50°, 55°, 60°, 90°, 180° and 270° with gas nitrogen UHP. Based on the results of research, it was found that the right Nitrogen UHP gas pipe openings were 45° to 50°, with the Reynold Number in stage 2 being 240 - 313 which is a laminar flow pattern. Based on calculations, the total pressure drop form all distillation stages for openings gas valve 45° to 50° is 7 - 9 Pascal. The average ~(32)P radioisotope purity obtained before determination and measurement of flow patterns, openings gas valve nitrogen UHP, and proper pressure drop, was 80.4% and after determination and measurement increased to 99.9%.