Title:
RADIOACTIVE FINE PARTICLE MANUFACTURING SYSTEM, AND RADIOACTIVE FINE PARTICLE MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/173811
Kind Code:
A1
Abstract:
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).
Inventors:
TOKONAMI SHINJI (JP)
Application Number:
PCT/JP2018/009285
Publication Date:
September 27, 2018
Filing Date:
March 09, 2018
Export Citation:
Assignee:
UNIV HIROSAKI (JP)
International Classes:
G21G4/10; G21G4/06; G21H5/00
Foreign References:
| JP2010038802A | 2010-02-18 |
Other References:
TOKONAMI, SHINJI ET AL.: "Intercomparison exercise of measurement techniques for radon, radon decay products and their particle size distributions at NIRS", JPN. J. HEALTH PHYS., vol. 40, no. 2, 2005, pages 183 - 190, XP055556229
HASSAN, N. M. ET AL.: "The effect of water content on the radon emanation coefficient for some building materials used in Japan", RADIATION MEASUREMENTS, vol. 46, no. 2, February 2011 (2011-02-01), pages 232 - 237, XP055556235, Retrieved from the Internet
SHINJI TOKONAMIYUU ISHIMORITETSUO ISHIKAWAKEIZO YAMASAKIYUJI YAMADA: "Intercomparison Exercise of Measurement Techniques for Radon, Radon Decay Products and Their Particle Size Distributions at NIRS", JPN. J. HEALTH PHYS., vol. 40, no. 3, 2005, pages 183 - 190, XP055556229, doi:10.5453/jhps.40.183
A.SORIMACHIS.KUMAR SAHOOS. TOKONAMI: "Genaration and control of thoron emanated from lantern mantles", REV. SCI. INSTRUM., vol. 80, 2009, pages 015104
S. TOKONAMIM.YANGH.YONEHARAY. YAMADA: "Simple, discriminative measurement technique for radon and thoron concentrations with a single scintillation cell", REV. SCI. INSTRUM., vol. 73, 2002, pages 69, XP012039395, doi:10.1063/1.1416121
A.SORIMACHIM.JANIKS.TOKONAMIT.ISHIKAWA: "An intercomparison done at NIRS, Japan on continuos monitors for measuring °Rn concentration", APPLIED RADIATION AND ISOTOPES, vol. 107, January 2016 (2016-01-01), pages 145 - 151
HASSAN, N.M.ISHIKAWA, T.HOSODA, M.IWAOKA, K.SORIMACHI, A.SAHOO, S.K.JANIK, M.KRANROD, C.YONEHARA, ZH.FUKUSHI, M.: "The effect of water content on the radon emanation coefficient for some building materials used in Japan", RADIATION MEASUREMENTS, vol. 46, no. 2, February 2011 (2011-02-01), pages 232 - 237, XP055556235, doi:10.1016/j.radmeas.2010.11.006
ZHUO, W.IIDA, T.: "Estimation of thoron progeny concentrations in dwellings with their deposition rate measurements", JPN J. HEALTH PHYS., vol. 35, no. 3, 2000, pages 365 - 370
TOKONAMI, S.: "Why is °Rn (thoron) measurement important?", RADIAT. PROT. DOSIM., vol. 141, no. 4, 2010, pages 335 - 339
See also references of EP 3608920A4
HASSAN, N. M. ET AL.: "The effect of water content on the radon emanation coefficient for some building materials used in Japan", RADIATION MEASUREMENTS, vol. 46, no. 2, February 2011 (2011-02-01), pages 232 - 237, XP055556235, Retrieved from the Internet
SHINJI TOKONAMIYUU ISHIMORITETSUO ISHIKAWAKEIZO YAMASAKIYUJI YAMADA: "Intercomparison Exercise of Measurement Techniques for Radon, Radon Decay Products and Their Particle Size Distributions at NIRS", JPN. J. HEALTH PHYS., vol. 40, no. 3, 2005, pages 183 - 190, XP055556229, doi:10.5453/jhps.40.183
A.SORIMACHIS.KUMAR SAHOOS. TOKONAMI: "Genaration and control of thoron emanated from lantern mantles", REV. SCI. INSTRUM., vol. 80, 2009, pages 015104
S. TOKONAMIM.YANGH.YONEHARAY. YAMADA: "Simple, discriminative measurement technique for radon and thoron concentrations with a single scintillation cell", REV. SCI. INSTRUM., vol. 73, 2002, pages 69, XP012039395, doi:10.1063/1.1416121
A.SORIMACHIM.JANIKS.TOKONAMIT.ISHIKAWA: "An intercomparison done at NIRS, Japan on continuos monitors for measuring °Rn concentration", APPLIED RADIATION AND ISOTOPES, vol. 107, January 2016 (2016-01-01), pages 145 - 151
HASSAN, N.M.ISHIKAWA, T.HOSODA, M.IWAOKA, K.SORIMACHI, A.SAHOO, S.K.JANIK, M.KRANROD, C.YONEHARA, ZH.FUKUSHI, M.: "The effect of water content on the radon emanation coefficient for some building materials used in Japan", RADIATION MEASUREMENTS, vol. 46, no. 2, February 2011 (2011-02-01), pages 232 - 237, XP055556235, doi:10.1016/j.radmeas.2010.11.006
ZHUO, W.IIDA, T.: "Estimation of thoron progeny concentrations in dwellings with their deposition rate measurements", JPN J. HEALTH PHYS., vol. 35, no. 3, 2000, pages 365 - 370
TOKONAMI, S.: "Why is °Rn (thoron) measurement important?", RADIAT. PROT. DOSIM., vol. 141, no. 4, 2010, pages 335 - 339
See also references of EP 3608920A4
Attorney, Agent or Firm:
TANIDA Takuo (JP)
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