Nuclear Emulsion Films with HIMAC heavy ion beams
July 23, 2021
By adding suitable amount of Rhodium compound (Na3RhCl6∙5H2O) during the production of nuclear emulsion gel, it enabled to reduce the sensitivity of the nuclear emulsion films and realized the selection of heavy nuclei by using image processing system suitable for minimum ionized particles. We have carried out the beam exposure to desensitized nuclear emulsion films in October, 2019 at Heavy Ion Medical Accelerator in Chiba(HIMAC). When charged particles passed through the nuclear emulsion films, the tracks were measured as a series of silver grains of which size is typically less than one micrometer, and we traditionally determine their charge amount by measuring ionization loss signals such as grain density, delta-ray count. In this study, we measured the energy losses of heavy ion beams in desensitized nuclear emulsion films exposed horizontally to emulsion layer, and we have estimated the desensitization effect for heavy ion detections.
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