DEVELOPMENT OF IN-SITU SYSTEMS FOR 13CO2 EXPOSURE AND DETERMINATION OF 13C NET ASSIMILATION RATE OF FRUIT-BEARING SHOOTS AND WHOLE TREE AND CHAMBER FOR PRECISION 13CO2 EXPOSURE OF YOUNG POTTED TREES. Issue 13 (9th September 2022)

• Record Type: Journal Article
• Authors: Tako, Yasuhiro; Arai, Ryuji; Yanagawase, Yoshiyuki; Nishikawa, Syu-ichi; Fujimoto, Koji; Imada, Shogo; Moriya, Yuki
• Is Part Of: Radiation protection dosimetry. Volume 198:Issue 13/15(2022)
• Page Start: 1175
• Page End: 1182
• Publication Date: 2022-09-09
• Subjects: Radiation dosimetry -- Periodicals; Radiation -- Safety measures -- Periodicals; 363.1799
• DOI: 10.1093/rpd/ncac144
• Languages: English
• ISSNs: 0144-8420

Abstract

Abstract: 14 C is the most important radionuclide for assessing exposure dose around the Rokkasho nuclear fuel reprocessing plant, Aomori Prefecture, Japan. A simplified model with ample margins has been used so far for the assessment of the dose derived from 14 C. Realistic dose estimate of 14 C using more realistic model is necessary for safety. Apple production is an important core industry in Aomori Prefecture. To construct the dynamic model for apple, using 13 C as a tracer to substitute for 14 C, we collected data on 13 C abundance in organs including fruit after 13 CO2 exposure at various fruit growth stages. We developed 13 CO2 exposure systems for three intact fruit-bearing shoots (1), whole mature tree (2) and young potted trees (3). Systems (1) and (2) also can determine net amounts of carbon and 13 C photoassimilated. System (3) is capable of precise feedback control of 13 CO2 and 12 CO2 concentrations based on on-time determination.