The current ¹³⁷Cs pollution on cherry tree barks of Northern Fukushima Prefecture was studied nine-ten years after the accident at TEPCO's Fukushima-Daiichi Nuclear Power Plant. The radiocesium-containing hexahedron particles of size 2 μm were found in 2020 in the strong spots of the cherry tree bark that were collected in Fukushima in 2015. The ¹³⁷Cs pollution in the cherry tree bark of Northern Fukushima Prefecture decreases each year and the expected radioactive particles are cesium salt.

 The induction coil attached to the Crookes tube of electric discharge type used for the electron beam experiment in junior high and high schools was applied to other science experiments such as corona discharge, candle flame, resonance by vibrators, and removal of frictional static electricity by X-ray irradiation. The validity of the experimental results was discussed. These experiments will contribute to not only the effective utilization of the instrument, but also to the understanding of multilateral functions of the instrument, of the ionization phenomenon and of though indirectly radiations.

 The purpose of this study was to examine the occupational exposure of the eye lens for nurses engaged in cardiovascular interventional radiology (IVR) and to determine the proper position to wear the eye dosimeter. Two types of cardiovascular IVR were investigated for 12 nurses : percutaneous coronary intervention (PCI) and catheter ablation (ABL). In PCI, the doses measured at the left eye side, right eye side, and the center of the forehead were almost same. However, in ABL, there was a tendency that the nurses received higher radiation doses at the eye side closer to the patients compared with the contralateral eye side and the center of the forehead. In addition, the eye doses in PCI tended to be highly correlated with patient dose parameters. This result may suggest that it is possible to estimate the eye dose without using a dosimeter, but it is necessary to actually measure the dose of the eye closer to the patient using the dosimeter.