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

H. Konishi et al., Nucl. Instrum. Methods, A372, 322 (1996) : [General description for BL-27A, B]
K. Kobayashi, Proc. International School of Physics, Course CXXVII, p333 (1996) : [Detail of radiobiology apparatus and laboratory]
M. Honda et al., Rev. Sci. Instrum., 86, 035103 (2015) : [Fluorescence XAFS measurement instrument at BL-27A]

Last updated: 2019-4-24

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