Instrumentation and performance evaluation of the XRS on SELENE orbiter

Shirai, Kei; Okada, Tatsuaki; Yamamoto, Yukio; Arai, Takehiko; Ogawa, Kazunori; Shiraishi, Hiroaki; Iwasaki, M.; Arakawa, Masashi; Grandé, M.; Kato, Manabu

doi:10.1186/bf03352792

Cited by 14 publications

(6 citation statements)

References 19 publications

(18 reference statements)

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“…It is therefore essential to investigate the particle size effect in XRF in more detail. The aim of this study was to thoroughly investigate the angular dependency of XRF intensity from a rough surface and addresses the importance of this effect, especially for the X-ray Spectrometer (XRS) experiments onboard the SELENE orbiter (Okada et al, 2002;Shirai et al, 2008).…”

Section: Si-pin (A)mentioning

confidence: 99%

Laboratory experiments of particle size effect in X-ray fluorescence and implications to remote X-ray spectrometry of lunar regolith surface

et al. 2008

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We performed laboratory experiments to investigate the effect of particle size in X-ray fluorescence (XRF) with respect to interpreting remote X-ray spectrometry. To simulate microscopic roughness of the uppermost surface of lunar regolith, we used powdery specimens of crashed rocks ranging 25 to 500 μm in size and flat rock plates for comparison. Our results show that XRF intensities from powdery specimens decrease relative to those from flat plates by up to 50%, especially for larger particle size and at increasing source-to-surface-to-detector angle (phase angle). Corrections should be required for elemental analysis by XRF spectrometry in the SELENE "Kaguya" and other planetary orbiter missions.

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Section: Si-pin (A)mentioning

confidence: 99%

Laboratory experiments of particle size effect in X-ray fluorescence and implications to remote X-ray spectrometry of lunar regolith surface

et al. 2008

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“…Finally, in order to simulate the energy resolution of the CCDs which expands each emission line, the Gaussian distribution (normal distribution) function was applied to all the energy bins of spectra. Typical energy resolution of the CCDs experimentally estimated is approximately 150 eV at Si-Kα, and 190 eV at Fe-Kα as the FWHM of the emission lines (Shirai et al, 2008).…”

Section: Apollo 12mentioning

confidence: 98%

“…The SOL-B and SOL-C will correct any spectral fluctuation caused by various solar activity. Detailed instrumentation and performances of the XRS are reported in other papers (Yamamoto et al, 2007;Shirai et al, 2008). SELENE will observe the Moon from nearly polar 100km circular orbits at a ground speed of approximately 1.5 km/s (Kato et al, 2007).…”

Section: Definitionmentioning

confidence: 99%

Numerical estimation of lunar X-ray emission for X-ray spectrometer onboard SELENE

et al. 2008

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We conducted a numerical estimation of lunar X-ray spectra, which is applicable for lunar X-ray fluorescence observations using an X-ray spectrometer (XRS) onboard the SELENE orbiter, with an improved simulation model. We investigated the integration times of measurements for six elements (Mg, Al, Si, Ca, Ti, and Fe) to achieve signal-to-background ratio of over 10 under various solar conditions. The results of these calculations indicate that expected along-the-track spatial resolutions of a single orbital path for Mg, Al and Si will be <90 km and 20 km under normal and active Sun conditions, respectively. Ca, Ti and Fe will be also detectable with a spatial resolution of 20 km during the periods active solar flares over M1 class happen to occur.

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“…The scientific instruments were categorized into five groups depending on their purposes. The groups are as follows: (1) x-ray spectrometer (XRS) and gamma-ray spectrometer (GRS) to determine the elemental abundance (Shirai et al 2008;Hasebe et al 2008);…”

Section: Onboard Science Instrumentsmentioning

confidence: 99%