PhotonFactory

IMSS KEK

BL-27A: Radiation biology, XPS, soft X-ray XAFS for radioactive samples

Overview

Experimental stations of BL-27 are located inside the 'hot' laboratory where radioactive materials or samples including U or Th can be handled. BL-27A is a soft X-ray station (1.8 to 6 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.

Techniques
  • Soft X-ray irradiation system for radiobiology
  • XPS
  • Soft X-ray XAFS (fluorescent mode)
Features
  • Biological samples can be irradiated with soft X-rays both in vacuum and in atmospheric condition.
  • Biological sample preparation rooms are situated in this hot area.
Area of Research
  • Radiation biology
  • Nuclear science
  • Environmental science for radioisotopes
Main Research Field for proposal submission
  • 1. Spectroscopy on electronic structure for XPS and XAFS proposal
    (5. Life science II for radiation biology proposal)
Contacts
  • Beamline Scientist : Noriko USAMI noriko.usami@kek.jp
  • WG Leader of Radiation Biology Users Group : Akinari YOKOYA (QST) yokoya.akinari@qst.go.jp
  • WG Leader of Nuclear Science Research Users Group : Yoshihiro OKAMOTO (JAEA) yokamoto@spring8.or.jp
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.

Performance

Source bending
Optics Bent cylindrical mirror [Pt coated SiC]
Double crystal monochromator [InSb(111)]
Energy Range 1.8 to 6 keV
Resolution E/dE 103
Photon Flux 1011 photons/s or 7kR/s in vacuum
1 kR/s in air at 2.1 keV
Beam Size 20 mm (H) x 4 mm (v) at biological irradiation chamber (in vacuum)
6 mm (H) x 3 mm (v) in air
Instruments
  • Irradiation apparatus for biological samples
    Sample scanning systems can be available in order to irradiate samples wider than the beam size.
  • Photoelectron spectrometer manufactured by VSW.
  • Fluorescence XAFS measurement instrument in the soft X-rays in air and in solution
Detectors
  • Free-air ionization chamber for radiobiological dose measurement
  • Peltier-cooled Si-PIN X-ray detector for fluorescence XAFS

References

  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. M. Honda et al., Rev. Sci. Instrum., 86, 035103 (2015) : [Fluorescence XAFS measurement instrument at BL-27A]

Last updated: 2019-4-24