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Takasaki Advanced Radiation Research Institute

Electron beam irradiation facility | 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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The 2 MV 60kW electron accelerator of the Cockcroft-Walton type is installed in the electron beam irradiation facility. The electron beam irradiation facility is widely utilized for industrial applications as well as material developments. The electron beam is a superior tool for polymer modification, flue gas treatment, and investigation of irradiation effects in semiconductor devices.

photo of Electron beam irradiation facility
Electron beam irradiation facility

photo of Electron Accelerator1
Electron Accelerator

Electron Accelerator

The electron accelerator, equipped with two acceleration tubes, has a dual beam system, supplying either a vertical or a horizontal electron beam. When an experiment is carried out in the vertical beam irradiation room, preparation for the next experiment can be done in the horizontal beam irradiation room.

Specificationof the accelerator

  • Acceleration voltag : 0.5 – 2.0 MV
  • Beam current : 0.1 – 30 mA
  • Scanning width
    120 cm (vertical)
    60 cm (horizontal)
  • Dose rate : ~ 60 kGy/s

photo of Electron Accelerator2
Sectional view : High-voltage circuit is keep in the vault, and an electrical isolation is kept by high-pressure SF6 gas.

Depth-dose distribution

The right-hand figure is an example of the depth-dose distribution for 1 and 2 MeV electrons injected into liquid water. The dose rate is normalized with the maximum value. The electron range and dose homogeneity in liquid water can be estimated from this data.

photo of Depth-dose distribution