Photon Factory


BL-27B: Radiation biology, XAFS for radioactive samples


Experimental stations of BL-27 are located inside the 'hot' laboratory where radioactive materials or samples including U or Th can be handled. BL-27B is an X-ray station (4 to 20 keV) which is one of the branch lines of BL-27. BL-27 has been co-operated by the Radiation Biology Users Group and Nuclear Science Research Users Group since FY2019.

  • X-ray Microbeam irradiation system for radiobiology
  • XAFS (transmission mode and fluorescent mode)
  • The only microbeam irradiation system for radiobiology with synchrotron radiation.
  • Biological sample preparation rooms are situated in this area.
  • Ideal for the analysis of nuclear fuel materials which consist various elements.
Area of Research
  • Radiation biology
  • Nuclear science
  • Environmental science for radioisotopes
  • Beamline Scientist : Noriko USAMI
  • WG Leader of Radiation Biology Users Group : Akinari YOKOYA (QST)
  • WG Leader of Nuclear Science Research Users Group : Yoshihiro OKAMOTO (JAEA)
Spacial notes
  • The governmental law strictly limits usable amount of radioactivity. Users who wish to use radioisotopes should be contact with the beamline scientist in advance.


Source bending
Optics: Monochromator Double crystal monochromator [Si(111)]
Optics: Mirror or focusing devices Bent plane SiO2
Energy Range 4 to 20 keV
Resolution E/dE 104
Beam Size 40 mm (H) x 6 mm (v) (not-focused)
minimum, 5 micro-meter square (microbeam for radiation biology)
Photon Flux 1011 photons/s
0.3 Gy/s for 5.35 keV microbeam
  • Irradiation apparatus for biological samples
    Sample scanning systems can be available in order to irradiate samples wider than the beam size.
  • XAFS spectrometer
  • IRD Photodiode and free-air ionization chamber for radiobiological dose measurement
  • Multi-element Ge SSD and gas-flow ionization chambers for XAFS


  1. H. Konishi et al., Nucl. Instrum. Methods, A372, 322 (1996) : [General description for BL-27A, B]
  2. K. Kobayashi, Proc. International School of Physics, Course CXXVII, p333 (1996) : [Detail of radiobiology apparatus and laboratory]
  3. K. Kobayashi et al., J. Biomed. Nanotech., 2, 116 (2006) : [Detail of microbeam irradiation system]

Last updated: 2019-4-25