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Journal Articles

Ultrasensitive resonance ionization mass spectrometer for evaluating krypton contamination in xenon dark matter detectors

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

Nuclear Instruments and Methods in Physics Research A, 797, p.64 - 69, 2015/10

 Times Cited Count:3 Percentile:32.14(Instruments & Instrumentation)

An ultrasensitive resonance ionization mass spectrometer that can be applied to evaluate krypton (Kr) contamination in xenon (Xe) dark matter detectors has been developed for measuring Kr at the parts-per-trillion (ppt) or sub-ppt level in Xe. The gas sample is introduced without any condensation into a time-of-flight mass spectrometer through a pulsed supersonic valve. Using a nanosecond pulsed laser at 212.6 nm, $$^{84}$$Kr atoms in the sample are resonantly ionized along with other Kr isotopes. $$^{84}$$Kr ions are then mass separated and detected by the mass spectrometer in order to measure the Kr impurity concentration. With our current setup, approximately 0.4 ppt of Kr impurities contained in pure argon (Ar) gas are detectable with a measurement time of 1,000 s. Although Kr detection sensitivity in Xe is expected to be approximately half of that in Ar, our spectrometer can evaluate Kr contamination in Xe to the sub-ppt level.

Oral presentation

Status and future issues of neutralization of acid water using control typed muck

Yamanishi, Takeshi; Sekiya, Yoshitomo; Sataka, Hiroyuki; Kitagawa, Yoshito*; Kato, Kinya*

no journal, , 

no abstracts in English

Oral presentation

Shortening time of the soil filtration for soil elution tests

Itabashi, Hideharu; Sekiya, Yoshitomo*; Sataka, Hiroyuki; Shimada, Tomohiro*; Kato, Kinya*

no journal, , 

no abstracts in English

Oral presentation

Studies on the removal of radon contained in xenon using laser resonance ionization

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

no journal, , 

no abstracts in English

Oral presentation

Development of a vacuum ultraviolet laser for the removal of radon contained in xenon

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

no journal, , 

no abstracts in English

Oral presentation

Observation of a resonance ionization signal of radon for the removal of radon contained in xenon

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

no journal, , 

no abstracts in English

Oral presentation

Studies on steady removal of noble gas impurities using laser resonance ionization

Iwata, Yoshihiro; Sekiya, Hiroyuki*

no journal, , 

no abstracts in English

Oral presentation

Status of development of a method for the removal of radon using laser resonance ionization

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

no journal, , 

no abstracts in English

Oral presentation

Development of a Rn removal system for future Xe-based neutrino detectors using resonant ionization

Sekiya, Hiroyuki*; Iwata, Yoshihiro; Ito, Chikara

no journal, , 

no abstracts in English

Oral presentation

Measurement of noble gas impurities using laser resonance ionization

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

no journal, , 

no abstracts in English

Oral presentation

Studies on steady removal of noble gas impurities using laser resonance ionization

Iwata, Yoshihiro; Sekiya, Hiroyuki*

no journal, , 

no abstracts in English

Oral presentation

Measurement of noble gas impurities in xenon dark matter detectors using resonance ionization mass spectrometry

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

no journal, , 

no abstracts in English

Oral presentation

Measurement of noble gas impurities using laser resonance ionization, 2

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

no journal, , 

no abstracts in English

Oral presentation

Study on reflection of operating experience of Prototype Fast Breeder Reactor Monju fuel handling system to the next generation FBR

Rekimoto, Masafumi; Ando, Masato; Chikazawa, Yoshitaka; Kato, Atsushi; Hamano, Tomoharu; Shiohama, Yasutaka; Miyagawa, Takayuki*; Uzawa, Masayuki*; Hara, Hiroyuki*; Yamauchi, Kanau*; et al.

no journal, , 

no abstracts in English

Oral presentation

Measurement of Gd$$^{3+}$$ ion emission lifetime in aqueous solution of Gd sulfate

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ito, Chikara

no journal, , 

We are studying the measurement of Gd$$^{3+}$$ ion emission lifetime in aqueous solution of Gd sulfate. In this study, a nanosecond pulsed laser at 266 nm was used as the excitation light source, and emission at 312 nm was detected by a photomultiplier tube attached to a monochromator. The emission lifetime was measured to be about 2 ms, which was longer than that of other lanthanoid ions.

Oral presentation

A Study on the emission characteristics of gadolinium ions in a water Cherenkov detector

Iwata, Yoshihiro; Sekiya, Hiroyuki*; Ieki, Kei*; Ito, Chikara

no journal, , 

Emission characteristics of gadolinium ions (Gd$$^{3+}$$) in water are studied to estimate the effect of ion emission on the water Cherenkov detector. The emission lifetime is about 5 ms, and it was found that Gd$$^{3+}$$ emission measurement using a pulsed laser at 252.3 nm can be used for remote monitoring of Gd concentration in the range 0.01-0.1%.

16 (Records 1-16 displayed on this page)
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