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Takasaki Advanced Radiation Research Institute

Irradiation Facilities Section | National Institutes for Quantum and Radiological Science and Technology Quanturn Beam Science Research Directorate Takasaki Advanced Radiation Research Institute

Update:2018年12月26日更新
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Irradiation Facilities Section covers operation, maintenance and dosimetry of three cobalt-60 gamma-ray irradiation facilities and an electron accelerator facility. Gamma-ray facilities consist of Cobalt-60 irradiation facility No.1 (three irradiation cells), Cobalt-60 irradiation facility No.2 (three irradiation cells) and Cobalt-60 facility for food irradiation (two irradiation cells). Electron accelerator No.1 is Cockcroft-Walton type, and has 0.5-2.0 MeV, 0.1~30 mA in beam energy and beam current, respectively. This accelerator has two beam lines for vertical and horizontal directions and scanned beams are generated from both beam lines. These gamma-ray and electron irradiation facilities are opened for not only QST* but also extra users such as universities, private companies and public institutes.

photo of Cobalt-60 Gamma-ray Irradiation Facility No.1
Cobalt-60 Gamma-ray
Irradiation Facility No.1

photo of Cobalt-60 Gamma-ray Irradiation Facility No.2
Cobalt-60 Gamma-ray
Irradiation Facility No.2

photo of Electron Beam Irradiation Facility No.1
Electron Beam
Irradiation Facility No.1

photo of Food Irradiation Facility
Cobalt-60 Gamma-ray
Food Irradiation Facility

*QST : National Institutes for Quantum and Radiolodical Science and Technology

/ History of Takasaki Institute /

  • 2016 / QST : National Institutes for Quantum and Radiolodical Science and Technology
    Takasaki Advanced Radiation Research Institute
  • 2005 / JAEA : Japan Atomic Energy Agency
    Takasaki Advanced Radiation Research Institute
  • 1963 / JAERI Takasaki Radiation Chemistry Reserch Establishment
    ( 1956 / JAERI : Japan Atomic Energy Research Institute )

Cobalt-60 Gamma-ray Irradiation Facilities

photo of Cobalt-60 Gamma-ray Irradiation FacilitiesThe Cobalt-60 gamma-ray irradiation facilities at Takasaki consist of three facilities equipped with strong 60Cosources and deep water pools to store the sources: First Co-60 Irradiation Facility, Second Co-60 Irradiation Facility and Food Irradiation Facility. The pools are under irradiation rooms, and each of the 60Co sources is stored at its storing position in the water. The irradiation rooms are equipped with a mechanism to move vertically the 60Co source from the storing position to the position in the air for irradiating samples. Irradiation is remotely controlled from the control desk in an operation room. The walls of the irradiation rooms are made of heavy concrete with thickness of 1.3 meters; no gamma-rays leak outside. With these facilities, studies such as radiation resistance test of material and devices for use in nuclear facilities or space, development of new functional polymers, radiation-biotechnology, irradiation effects in semiconductor are carried out.

Electron Beam Irradiation Facility

photo of Electron Beam Irradiation FacilityOne electron irradiation facility called First Accelerator, equipped with a 2-MeV electron accelerator, is operated at present. The electron accelerator consists of a high-voltage generation device and an electron-acceleration device. The high voltage at 2 MV is generated by the Cockcroft-Walton circuit, and held without discharging with a help of SF6 insulating gas. In the electron-acceleration device, electrons, emitted from heated filaments, are accelerated through a vacuum tube by the generated high voltage, pass the metallic window at the end of the vacuum tube and come out into the air to irradiate samples. First Accelerator has two acceleration tubes: one is horizontal and the other is vertical. Each acceleration tube has a beam scanner before the window to expand the electron beam. With the horizontal acceleration tube, one can irradiate large samples like a large volume of gas. With the vertical acceleration tube, sample conveyors are available. With First Accelerator, studies such as improvement of polymers, investigation of irradiation effects in semiconductor, etc. have been carried out.

Dosimetry Technology Development

/ Gamma-ray /

Measurement of accurate energy delivered to materials is indispensable for evaluation of irradiation effects. Absorbed dose is used to estimate the energy dissipated in materials. The study on measurement of absorbed dose is performed to support radiation applications. 

High quality dosimetry at high dose rate : 
 A parallel-plate ionization chamber was developed for high exposure rate (0.1-500 C/kg/h) measurements. The reliability of the ionization chamber is maintained by periodic checks of traceability against national exposure rate standard measurements in National Institute of Advanced Industrial Science and Technology (AIST). 

Development of PMMA dosimeter 'Radix W' : 
 Radix W, a clear polymethylmethacrylate (PMMA) dosimeter based on radiation-induced coloration, can measure a wide dose range of 1 - 150 kGy. The absorbed dose of the dosimeter is estimated from the optical density measured using a spectrophotometer. 

/ Electron Beam /

A total absorption type calorimeter and an electron beam density meter were developed. Incident electron energy can be determined from the data obtained with each instrument. Furthermore, calibration of a secondary dosimeter such as a film dosimeter can be performed by simultaneous irradiation together with the instruments. 

Development of routine dosimeter : CTA film dosimeter : 
The principle of the dosimetry is based on the increase in optical absorbance of UV light by irradiation. It is a long transparent film with 0.125-mm thickness and 8-mm width. The cellulose triacetate (CTA) film dosimeter has excellent characteristics for electron beam dosimetry in the dose range from 10 kGy to 300 kGy.

Publications

A. Recent Annual Reports and Papers

JAEA Takasaki Annual Report 2014, JAEA-Review 2015-022, 172-173 (2016)
' Operation of the Electron Accelerator and the 60Co Gamma-ray Irradiation Facilities '
' Utilization Status of the Electron Accelerator and the Gamma-ray Irradiation Facilities '
JAEA Takasaki Annual Report 2013, JAEA-Review 2014-050, 182-183 (2015)
JAEA Takasaki Annual Report 2012, JAEA-Review 2013-059, 180-181 (2014)

' Detection of a gas region in a human body across a therapeutic carbon beam by measuring low-energy photons '
M. Yamaguchi, Y. Nagao, N. Kawachi, T. Satoh, S. Fujimaki, T. Kamiya, K. Torikai, H. Shimada, H. Sugai, M. Sakai, K. Arakawa, T. Nakano
Int. J. PIXE, Vol 26, 61-72 (2016)

' Preparation of polymer gel dosimeters based on less toxic monomers and gellan gum '
A. Hiroki, Y. Sato, N. Nagasawa, A. Ohta, H. Seito, H. Yamabayashi, T. Yamamoto, M. Taguchi, M. Tamada, T. Kojima
Phys. Med. Biol., Vol 58, 7131-7141 (2013)

' Beam range estimation by measuring bremsstrahlung '
M. Yamaguchi, K. Torikai, N. Kawachi, H. Shimada, T. Satoh, Y. Nagao, S. Fujimaki, M. Kokubun, S. Watanabe, T. Takahashi, K. Arakawa, T. Kamiya, T. Nakano
Phys. Med. Biol., Vol 57, 2843-2856 (2012)
Phys. Med. Biol., Vol 61, 3638-3644 (2016)( corrigendum )

' Dosimetry for 110 keV electron beam processing '
H. Seito, S. Matsui, T. Hakoda, M. Ishikawa, Y. Haruyama, H. Kaneko, J. Kimura, T. Kojima
Mater. Technol., Vol 30, 10-16 (2012)

B. Dosimeters ( Main Publications )

/ Ionization Chamber /

' Ionization Chamber System for Calibration of 60Co γ-Ray High-Dose Rate at Radiation Processing Level '
T. Kojima et al., RADIOISOTOPES, Vol 50, 291-300 (2001) ( in Japanese except for abstract, tables and figures )

' Standard measurement of processing level gamma ray dose rates with a parallel-plate ionization chamber '
R. Tanaka et al., IAEA-SM-272/17, 203-220 (1985)

' Comparison of gamma-ray exposure rates between the ionization chambers '
R. Tanaka et al., JAERI-M 6346 (1975) ( in Japanese except for abstract, tables and figures )

/ Alanine Dosimeter /

' The Effect of temperature on the response of alanine dosimeters under low dose and long time irradiation '
Y. Nagao et al., RADIOISOTOPES, Vol 61, 173-177 (2012) ( in Japanese except for abstract, tables and figures )

' Irradiation and ESR analysis temperature dependence of the gamma-ray response of alanine-polystylene dosimeters '
T. Kojima et al., Appl. Radiat. Isot., Vol 47, 457-459 (1996)

' Fading characteristics of an alanine-polystyrene dosimeter '
T. Kojima et al., Appl. Radiat. Isot., Vol 43, 863-867 (1992)

' High-dose dosimetry using electron spin resonance (ESR) spectroscopy '
T. Kojima, R. Tanaka, RADIOISOTOPES, Vol 41, 320-330 (1992) ( in Japanese )

' Polymer-alanine dosimeter and compact reader '
T. Kojima, R. Tanaka, Appl. Radiat. Isot., Vol 40, 851-857 (1989)

/ PMMA Dosimeter /

' Application of clear polymethylmethacrylate dosimeter Radix W to a few MeV electron in radiation processing '
H. Seito et al., Radiat. Phys. Chem., Vol 78, 961-965 (2009)

' Characteristics study of clear polymethylmethacrylate dosimeter, Radix W, in several kGy range '
H. Seito et al., Radiat. Phys. Chem., Vol 78, 356-359 (2009)

' Gamma-ray response of clear, crosslinked PMMA dosimeter '
M. Takehisa et al., Radiat. Phys. Chem., Vol 76, 1619-1623 (2007)

' The gamma-ray response of clear polymethylmethacrylate dosimeter Radix RN15 '
T. Kojima et al., Appl. Radiat. Isot., Vol 43, 1197-1202 (1992)

/ CTA Film Dosimeter /

' Effects of temperature, relative humidity, and dose rate on the sensitivity of cellulose triacetate dosimeters to electron and γ-rays '
R. Tanaka et al., Appl. Radiat. Isot., Vol 35, 875-881 (1984)

' Manual of CTA Dose Meter ' 
R. Tanaka et al., JAERI-M 82-033 (1982) ( in Japanese except for abstract, table and figures )

' Properties of cellulose triacetate dose meter '
N. Tamura et al., Radiat. Phys. Chem., Vol 18, 947-956 (1981)

/ Radio-Chromic Film Dosimeter ( FWT, GAF, B3 ) /

' 3-45 MeV/u ion beam dosimetry using thin film dosimeters '
T. Kojima et al., Radiat. Phys. Chem., Vol 68, 975-980 (2003)

' Easy measurement system for two dimensional relative dose distribution of ion beam using Gaf-chromic film and image scanner '
T. Agematsu et al., RADIOISOTOPES, Vol 57, 87-98 (2008) ( in Japanese except for abstract, table and figures )

/Fricke Dosimeter/

' Fricke dosimetry in low dose range for food irradiation '
T. Kume et al., JAERI-M 82-100 (1982) ( in English )

/ Calorimeter for Electron Beam /

' A total-absorption calorimeter for medium-energy electron beam calibration '
H. Sunaga et al., Radiat. Phys. Chem., Vol 46, 1283-1286 (1995)

' A simultaneous electron energy and dosimeter calibration method for an electron beam irradiator '
R. Tanaka et al., IAEA-SM-314/53, 189-201 (1991)

/ Current Density Measurement for Electron Beam /

' Methods for measuring dose and beam profiles of processing electron accelerators '
R. Tanaka et al., IAEA-SM-272/18, 317-331 (1985)

' A simple and accurate measurement method of current density of an electron accelerator for irradiation '
R. Tanaka et al., Nucl. Instrum. Methods, Vol 174, 201-208 (1980)

C. Comparison of Dosimetry, Irradiation Facilities, etc. ( Main Publications )

/ Comparison of Dosimetry /

' Uncertainty estimation in 60Co gamma-ray dosimetry at JAERI involving a two-way dose intercomparison study with NPL in the dose range 1-50 kGy '
T. Kojima et al., Radiat. Phys. Chem., Vol 54, 619-626 (1999)

' Consistency in evaluation of a few MeV electron dose and Co-60 gamma ray dose in radiation processing. Radiation technology in emerging industrial applications '
T. Kojima et al., IAEA-SM-365/56, 216-219 (2000)

/ Simulation /

' Simulation Technique on Dose-rate Distribution in a 60Co Gamma-ray Irradiation Field '
H. Kaneko et al., RADIOISOTOPES, Vol 59, 11-19 (2010) ( in Japanese except for abstract, tables and figures )

' Calculation of Spatial Distribution of Dose Rate in Air Under 300 keV Electron Beam Irradiation Using a Monte Carlo Code (EGS4-SPG code) '
T. Hakoda et al., RADIOISOTOPES, Vol 54, 161-168 (2005) ( in Japanese except for abstract and figures )

/ Estimation of Dosimetry for Low Energy Electron Beam /

' Dosimetry for 110 keV electron beam processing '
H. Seito et al., Mater. Technol., Vol 30, 10-16 (2012)

' Absorbed Dose Rate Distribution in 300 keV Electron Beam Irradiation Field for Waste-gas Purification '
T. Hakoda et al., RADIOISOTOPES, Vol 53, 59-69 (2004) ( in Japanese except for abstract and figures )

/ Irradiation Facilities /

' Characterization and Performance Study of High-dose 60Co Gamma-ray Calibration Laboratory for Radiation Processing '
H. Tachibana et al., RADIOISOTOPES, Vol 48, 247-256 (1999) ( in Japanese except for abstract, tables and figures )

' Output Characteristics of 2 MeV, 60 kW, Dual Beam Type Electron Accelerator of TRCRE, JAERI '
T. Kanazawa et al., JAERI-M 86-005 (1986) ( in Japanese except for abstract, tables and figures )

' 2 MeV, 60 kW Dual-Beam Type Electron Accelerator Irradiation Facility '
K. Yotsumoto et al., JAERI-M 84-032 (1984) ( in Japanese except for abstract, tables and figures )

D. Review and Books ( Main Publications )

' High-dose dosimetry and its application '
T. Kojima et al., Meas. Stand. Metrol. Manag., Vol 57, No 3, 23-28 (2007) ( in Japanese )

' Technology and Application of Low Energy Electron Beam '
H. Sunaga et al., CMC Publishing CO.,LTD. 36-49 (2006) ( in Japanese )

' Radiation Dosimetry of Electron Beams for Radiation Processing '
CHIJIN SHOKAN CO.,LTD. (1990) ( in Japanese )

E. JIS ( Japanese Industrial Standards ) for dosimetry concerned with our technology

' The alanine dosimetry system '
JIS Z 4571:2001 ( in Japanese )

' Standard practice for use of a polymethylmethacrylate dosimetry system '
JIS Z 4572:2014 ( in Japanese )

' Practice for use of a cellulose triacetate dosimetry system '
JIS Z 4573:2016 ( in Japanese )

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