The radical scavenging activity(RSA) of 13 kinds of γ-ray irradiated Kampo extracts were studied by ESR spin-trap method. The RSA against alkoxy radical and hydroxyl radical were measured using new spin trapping reagent CYPMPO. The RSA against these two radicals were evaluated using GSH for alkoxy RSA and L-ascorbic acid for hydroxy RSA as a standard antioxidant reagent. We revealed that a few Kampo extracts showed high RSA against alkoxy radical and also hydroxy radical. This RSA of Kampo extracts was changed by γ-ray irradiation treatment. Using ESR spin-trap method, it is concluded that the effect of radiation treatment on RSA of Kampo extracts were able to detect.
Using Pulse-Electron Spin Resonance(Pulse-ESR) spectroscopy and Continuous Wave-Electron Spin Resonance(CW-ESR) spectroscopy, we revealed the relaxation time(T1, T2) of radicals induced in irradiated foods. The relaxation time was directly analyzed by Pulse-ESR. Using CW-ESR, the relaxation time was calculated by the measured spectrum parameter indirectly. We succeeded in the detection of Pulse-ESR signal of irradiated hard wheat flour and irradiated black pepper. It was suggested that using CW-ESR T1 and T2 can be calculated effectively, but the value was tend to slightly lower due to the parameters for calculation are affected by the contents of food especially protein.
We investigated the determination of ethyl tert-butyl ether(ETBE) contents in red simulated gasoline containing 10% or 25% of ETBE by liquid scintillation counting(LSC). The ETBE contents were determined precisely after removal of red fuel dye using activated clay at the weight ratios of clay/gasoline were 0.1-0.2(w/w). Reduced amount of activated clay caused incomplete removal of dye, resulting in a decrease of counting efficiencies of LSC. When the weight ratios of clay exceeded 0.2, significant decreases in ETBE contents were observed.
We made supplementary materials of the radiation education as a pamphlet for junior high school students along the government course guidelines for junior high school pressed by Ministry of Education, Culture, Sports, Science and Technology. The pamphlet was published as booklet and calendar. For teachers at junior high schools, a pdf file of the booklet was also appended. The pamphlet focused natural phenomenon and latest researches in the radiation science. Many pictures in the booklet could help students to study the radiation science visually. For 100 days since March 2012 published day, 4119 booklets had been distributed to junior high schools and other schools of applicants, free of charge.
All the normal matter around us is well described by the standard model of particle physics. On the other hand we found that the majority of the matter in the Universe does not fit into this standard model. Its gravitational effects clearly show the existence of this other form of matter, which we call Dark Matter. The physical nature of Dark Matter is not known yet, but it is expected to consist of at least one kind of new particles. The particles we know inside the standard model are all inconsistent with our observations of Dark Matter. In this article we discuss particle candidates, their respective detection methods, and the status of ongoing experiments to detect Dark Matter particles.
Theory of the hyperfine interactions, which is essential in understanding and analyzing Mössbauer spectrum, is reviewed. The widely accepted theoretical model of the hyperfine interactions is explained together with first-principles approaches to calculating them, followed by detailed description of the isomer-shift, hyperfine field and electric field-gradient. As a related topic, the electronic structure of YbAlB4 is discussed from the viewpoint of the valency and its relation to the isomer shifts, which may be measured through nuclear resonant forward scattering Mössbauer spectrometry.