An ectomycorrhizal ammonia fungus Hebeloma vinosophyllum was cultivated in the Ohta's liquid medium with Cs and different concentrations of NH4+. This fungus absorbed caesium and coexisting elements(K, Ca, Mg, Zn, Cu, Fe and P) with the highly transfer factors. The highest translocation from mycelium to fruit body was observed in Cs among 8 analysed elements. The uptake of Cs might have a similar pattern to those of K and P. However, the high concentration of NH4+ might affect as the competitor to the uptake of both Cs and K, but not to the uptake of P. The addition of NH4+ affected more the uptake of Cs than that of K.
We studied the development of the soybean root system under different application of fertilizer applying neutron imaging technique. When neutron beam was irradiated, the root image as well as fertilizer imbedded in a thin aluminum container was clearly projected, since water amount in roots are higher than that in soil. Through image analysis, the development of root system was studied under different application of the fertilizer. The development of a main root with lateral roots was observed without applying fertilizer. When the fertilizer was homogeneously supplied to the soil, the morphological development of the root showed the similar pattern to that grown without fertilizer, in different to the amount of the fertilizer. In the case of local application of the fertilizer, lateral position or downward to the main root, the inhibition of the root growth was observed, suggesting that the localization of the fertilizer is responsible for reduction of the soybean yield.
Radiocaesium levels were determined in wild mushrooms collected from low-level contaminated forest area in east Japan about 6 months after the Fukushima Daiichi Nuclear Power Plant accident. Relatively high levels of radionuclides contamination of wild mushrooms and forest litter occurred along the radioactive plumes path. Usually, radioactivity levels in mushrooms did not exceed those of neighboring forest litter. It was found that the residual 137Cs radioactivity, due to nuclear weapons test or the Chernobyl accident, still remained in soil and collected by mushrooms.
The vegetables grown in the two different fields 60 and 230km apart from the Fukushima Daiichi Nuclear Power Plant accident were examined after the accident to determine the concentration of 134Cs, 137Cs and 40K together with those of soil. For the edible part, the transfer of 134Cs and 137Cs was observed to potato tuber only in the field of about 60km apart from Fukushima Daiichi Nuclear Power Plant. The contamination of radioactive caesium(134Cs+137Cs)was less than 7Bq/kg-wet weight in tuber and that of soil was less than or equal to 1235Bq/kg-dry weight. As to the edible part of cabbage and lettuce grown in each field, the concentration of 134Cs and 137Cs was less than the detection limit. The concentration of soil in each field was 651Bq/kg-dry weight or less. The concentration of 40K of each field was nearly constant in vertical direction, however that of 134Cs and 137Cs showed the vertical distribution of which the highest concentration was observed at soil surface.
We detected higher dose of radiation than background radiation from the surface of Doctor-Hericopter in the disaster relief of the great East Japan earthquake. We analyzed radionuclides emitting γ-rays with the Ge semiconductor detector, and detected fission products such as tellulium, iodine and caesium derived from the accident at Fukushima Daiichi Nuclear Power Plant. We reported the results of measuring a same sample in time course, and discussed on the decay of the sample in detail.
Our recent results obtained by nuclear resonant inelastic scattering are reviewed. Since most cage‐structured compounds consist of many atoms per unit cell, nuclear resonant inelastic scattering, an element-specific phonon spectroscopy, is powerful tool to investigate dynamics of guest atoms in cage-structured compounds. The free space for the guest atoms is one of the important parameter to discuss the dynamics of the guest atoms. The present work also revealed that the contribution of the guest modes to the acoustic modes is not small in all the cage-structured compounds.