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RADIOACTIVE FINE PARTICLE MANUFACTURING SYSTEM, AND RADIOACTIVE FINE PARTICLE MANUFACTURING METHOD NEW

外国特許コード F180009561
整理番号 (S2017-0542-N0)
掲載日 2018年11月2日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2018JP009285
国際公開番号 WO 2018173811
国際出願日 平成30年3月9日(2018.3.9)
国際公開日 平成30年9月27日(2018.9.27)
優先権データ
  • 特願2017-058121 (2017.3.23) JP
発明の名称 (英語) RADIOACTIVE FINE PARTICLE MANUFACTURING SYSTEM, AND RADIOACTIVE FINE PARTICLE MANUFACTURING METHOD NEW
発明の概要(英語) The objective of the present invention is to provide a radioactive fine particle manufacturing system and the like with which it is possible to manufacture physically stable radioactive fine particles without using large-scale equipment, which enable performance evaluation of a radioactivity measuring instrument employing a novel physical indicator, with which a method for controlling radioactivity concentration by means of the humidity of air is presented in a specific manner, and with which it is possible to implement performance evaluation of the overall radioactivity measuring instrument. A radioactive fine particle manufacturing system (1) uses a simple configuration provided with a radioactive gas producing system (10), a specific particle size aerosol generating system (20) and a mixing tank (30), to manufacture radioactive fine particles employing natural radioactive nuclides. 220 Rn is employed to manufacture radioactive fine particles using physically stable progeny nuclides. In the mixing tank (30), the progeny nuclides are caused to attach only to an aerosol having a specific particle size, to generate radioactive fine particles having a specific particle size. The radioactivity concentration of a natural radioactive noble gas can be controlled by means of a humidity control unit (100) which controls the humidity of acquired air OA and feeds the same to a radiation source unit (12).
従来技術、競合技術の概要(英語) BACKGROUND ART
Natural radionuclide gamma 222Rn in the sequence is one of the uranium series (radon) using a radioactive particles (radioactive aerosol) can be made is, radiation measuring device for calibration of the equipment (radon chamber) has been widely used in the (non-patent document 1).However, the radon chamber was a large-scale equipment.Gamma 220Rn is another sequence at the time of occurrence in the sequence (and thoron) thorium for the control of the gas chamber for monitoring the calibration of the gas has been conducted with respect to the published paper (Non-Patent Document 2).However, the paper is limited to a gas chamber for monitoring the calibration of the study and, after that study is not in progress, the development of the technology for manufacturing the radiation particles and is substantially not performed.Furthermore, 30-60 222Rn is about one minute to one another between the radioactive disintegration proceeds (218Po (3.1 min) →214Pb (26.8 min) (19.9 min) 214Bi such as→), a relatively stable long life (half-life of about 22 year 210Pb) radionuclide changed to.Therefore, a physically stable manufacturing of the fine particles is not radioactive.
Incidentally, 220Rn of the gas concentration measurement method is relatively easily measured, papers published by the inventors in the world by 2002 years (Non-Patent Document 3) has been widespread.The world standard techniques and measuring method, measuring the radioactivity of the commercially available for use in the calibration of the device (Non-Patent Document 4) becomes.Non-Patent Document 4 is for example commercially available as a measuring instrument (registered trademark) RAD7 of activity using a content of the calibration test has been described. 220Rn Measuring the concentration of the radioactivity in the art, the amount of moisture in the air into the gas for the source line is larger and the amount of generated 220Rn from the sample a great contribution, in other words the larger the amount of release 220Rn is clear (non-patent document 5).However, the humidity of the air by the radioactivity concentration in specific control method has not been revealed.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • HIROSAKI UNIVERSITY
  • 発明者(英語)
  • TOKONAMI SHINJI
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG

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