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Instruments / Technical Area	Publication Details	Published	Actions
I14-Hard X-ray Nanoprobe	New highly radioactive particles derived from Fukushima Daiichi reactor Unit 1: properties and environmental impacts Kazuya Morooka , Eitaro Kurihara , Masato Takehara , Ryu Takami , Kazuki Fueda , Kenji Horie , Mami Takehara , Shinya Yamasaki , Toshihiko Ohnuki , Bernd Grambow , Gareth T. W. Law , Joyce W. I. Ang , William R. Bower , Julia Parker , Rodney Ewings , Satoshi Utsunomiya Science Of The Total Environment DOI: 10.1016/j.scitotenv.2021.145639 Diamond Proposal Number(s): [21246] Show Abstract ▼ Abstract: A contaminated zone elongated toward Futaba Town, north-northwest of the Fukushima Daiichi Nuclear Power Plant (FDNPP), contains highly radioactive particles released from reactor Unit 1. There are uncertainties associated with the physio-chemical properties and environmental impacts of these particles. In this study, 31 radioactive particles were isolated from surface soils collected 3.9 km north-northwest of the FDNPP. Two of these particles have the highest particle-associated 134+137Cs activity ever reported for Fukushima (6.1 × 105 and 2.5 × 106 Bq per particle after decay-correction to March, 2011). The new, highly-radioactive particle labeled FTB1 is an aggregate of flaky silicate nanoparticles with an amorphous structure containing ~0.8 wt% Cs, occasionally associated with SiO2 and TiO2 inclusions. FTB1 likely originates from the reactor building, which was damaged by a H2 explosion, after adsorbing volatilized Cs. The 134+137Cs activity in the other highly radioactive particle labeled FTB26 exceeded 106 Bq. FTB26 has a glassy carbon core and a surface that is embedded with numerous micro-particles: Pb–Sn alloy, fibrous Al-silicate, Ca-carbonate or hydroxide, and quartz. The isotopic signatures of the micro-particles indicate neutron capture by B, Cs volatilization, and adsorption of natural Ba. The composition of the micro-particles on FTB26 reflects the composition of airborne particles at the moment of the H2 explosion. Owing to their large size, the health effects of the highly radioactive particles are likely limited to external radiation during static contact with skin; the highly radioactive particles are thus expected to have negligible health impacts for humans. By investigating the mobility of the highly radioactive particles, we can better understand how the radiation dose transfers through environments impacted by Unit 1. The highly radioactive particles also provide insights into the atmospheric conditions at the time of the Unit 1 explosion and the physio-chemical phenomena that occurred during reactor meltdown.	Feb 2021
I11-High Resolution Powder Diffraction	Spin resonance in the superconducting state of Li1−xFexODFe1−ySe observed by neutron spectroscopy N. R. Davies , M. C. Rahn , H. C. Walker , R. A. Ewings , D. N. Woodruff , S. J. Clarke , A. T. Boothroyd Physical Review B 94 DOI: 10.1103/PhysRevB.94.144503 Diamond Proposal Number(s): [13284] Show Abstract ▼ Abstract: We have performed inelastic neutron-scattering measurements on a powder sample of the superconductor lithium iron selenide hydroxide Li 1−x Fe x ODFe 1−y Se(x≃0.16,y≃0.02,T c =41K) . The spectrum shows an enhanced intensity below T c over an energy range of 0.64×2Δ	Oct 2016

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I14-Hard X-ray Nanoprobe

New highly radioactive particles derived from Fukushima Daiichi reactor Unit 1: properties and environmental impacts

Kazuya Morooka , Eitaro Kurihara , Masato Takehara , Ryu Takami , Kazuki Fueda , Kenji Horie , Mami Takehara , Shinya Yamasaki , Toshihiko Ohnuki , Bernd Grambow , Gareth T. W. Law , Joyce W. I. Ang , William R. Bower , Julia Parker , Rodney Ewings , Satoshi Utsunomiya

Science Of The Total Environment

DOI: 10.1016/j.scitotenv.2021.145639

Diamond Proposal Number(s): [21246]

Show Abstract ▼

Abstract: A contaminated zone elongated toward Futaba Town, north-northwest of the Fukushima Daiichi Nuclear Power Plant (FDNPP), contains highly radioactive particles released from reactor Unit 1. There are uncertainties associated with the physio-chemical properties and environmental impacts of these particles. In this study, 31 radioactive particles were isolated from surface soils collected 3.9 km north-northwest of the FDNPP. Two of these particles have the highest particle-associated 134+137Cs activity ever reported for Fukushima (6.1 × 105 and 2.5 × 106 Bq per particle after decay-correction to March, 2011). The new, highly-radioactive particle labeled FTB1 is an aggregate of flaky silicate nanoparticles with an amorphous structure containing ~0.8 wt% Cs, occasionally associated with SiO2 and TiO2 inclusions. FTB1 likely originates from the reactor building, which was damaged by a H2 explosion, after adsorbing volatilized Cs. The 134+137Cs activity in the other highly radioactive particle labeled FTB26 exceeded 106 Bq. FTB26 has a glassy carbon core and a surface that is embedded with numerous micro-particles: Pb–Sn alloy, fibrous Al-silicate, Ca-carbonate or hydroxide, and quartz. The isotopic signatures of the micro-particles indicate neutron capture by B, Cs volatilization, and adsorption of natural Ba. The composition of the micro-particles on FTB26 reflects the composition of airborne particles at the moment of the H2 explosion. Owing to their large size, the health effects of the highly radioactive particles are likely limited to external radiation during static contact with skin; the highly radioactive particles are thus expected to have negligible health impacts for humans. By investigating the mobility of the highly radioactive particles, we can better understand how the radiation dose transfers through environments impacted by Unit 1. The highly radioactive particles also provide insights into the atmospheric conditions at the time of the Unit 1 explosion and the physio-chemical phenomena that occurred during reactor meltdown.

Feb 2021

I11-High Resolution Powder Diffraction

Spin resonance in the superconducting state of Li1−xFexODFe1−ySe observed by neutron spectroscopy

N. R. Davies , M. C. Rahn , H. C. Walker , R. A. Ewings , D. N. Woodruff , S. J. Clarke , A. T. Boothroyd

Physical Review B 94

DOI: 10.1103/PhysRevB.94.144503

Diamond Proposal Number(s): [13284]

Show Abstract ▼

Oct 2016

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