Recently, the researches on radiation hormesis toward the animals and plants are made abundantly. The radiation hormesis effect is that subharmful doses of radiation may evoke a stimulatory response in any organism. We did irradiation experiments of fusion (DD and DT) neutron, thermal and fast neutron, and 60-cobalt gamma-ray to the dry seeds of Raphanus stivus, and examined whether radiation hormesis effects appeared by measuring germination rate, the length of a hypocotyl and a root and the total weight on the 7th day from starting cultivation. The evaluation of radiation hormesis effects was done by using relative effectiveness which is the ratio of the mean of the measurement objects of the irradiation group to that of non-irradiation group. In the Raphanus stivus the radiation hormesis effects of the measured objects were only turned up in seed groups irradiated by the fusion (D-T) neutron. We have confirmed that absorbed dose range where the effects are revealed is from 1 cGy to 10 Gy and there the relative effectiveness is from 1.05 to 1.25. In this research the model about radiation hormesis effect on Raphanus sativus confirmed in irradiation of D-T neutrons is proposed. And it is apparent that radiation from radio activated seeds influences hormesis effect on Raphanus sativus.

  Alpha radioactivity Measurement using ionized Air Transportation technology (AMAT) is developed to measure alpha contaminated wastes with large and complex surfaces. An outline of this project was described in this text. A major problem of AMAT technology is that the theoretical relation between alpha radioactivity and observed ion current is unclear because of the complicated behavior of ionized air molecules. An ion current prediction model covering from ionization of air molecules to ion detection was developed based on atmospheric electrodynamics. This model was described in this text, too.

  We have investigated the radiation resistivity of pure silica optical fibers and image guides, which are usable under severer nuclear environment, for long years as the most important issue. Radiation resistive characteristics are mainly determined by pure silica core materials. Our research has been directed towards finding the most effective dopant in pure silica core materials to prevents damage in the visual regions with γ－ray irradiation. The results clearly revealed that the F－doped cores have the most superior radiation resistivity in all the core materials,especially better than OH doped cores which have been generally considered to be the best.

  Moreover,the close correlation between the radiation resistivity and the index of refraction of pure silica glass material was found for the first time by this research.

  In the magnetic confinement fusion devices with DD or DT operation, the radiation measurement, such as neutron and gamma-ray detections, is one of the most important technique in the plasma diagnostics. This paper reviews the burning plasma diagnostics with neutrons, alpha particles and gamma-rays for the International Thermonuclear Experimental Reactor (ITER) and other large tokamaks.

  In this paper, neutron measurements traceable to the international system of units are shown to emphasize the importance of the world-wide uniformity of measurements. The international network is explained showing the Mutual Recognition Arrangement treated by fifty-one nations based on the Convention of the Metre. The Key comparisons of monoenergetic fast neutron fluence organized by the Consultative Committee for Ionization Radiation (CCRI) would be also shown.

  Scattering Mössbauer spectrometry used for our study is reviewed. Simultaneous measurements of depth selective conversion electron Mössbauer spectrometry (DCEMS) and resonant X-ray Mössbauer spectrometry (XMS) have been realized by using a back scattered type of dual gas proportional counter. The magnetic moments of martensite films deposited by RF and DC sputtering are apt to be perpendicular and parallel to the surface, respectively. 4 nm-thick iron oxide and 10 μm-thick layers can be characterized by CEMS and XMS, respectively. The relative peak intensity of ferritic and austenitic phases in high tensile steel suggests that sulfurizing dissolves the ferrite selectively. On the other hand, nuclear resonant X-rays are discriminated from non-resonant prompt X-rays of synchrotron radiation on the base of lifetime of nuclear excitation. Properties of nuclear forward scattering and inelastic scattering are summarized. Phonon density of states of perovskite related oxides are calculated from inelastic nuclear scattering of synchrotron radiation. Some properties of synchrotron radiation for scattering Mössbauer spectrometry are compared with those of radioisotope source.

The InterComparison of Cosmic rays with Heavy Ion Beams at NIRS (ICCHIBAN) project is an ongoing international collaboration to intercalibrate and to intercompare the response of the different detectors and dosimeters used for radiation dosimetry aboard piloted spacecraft. The ICCHIBAN-2 Experiment, the first dedicated to ground-based intercomparison of passive space dosimeters. The primary objective of the experiment was to intercompare the response of passive dosimeters used in space crew dosimetry to monoenergetic heavy ions of charge and energy spanning a significant portion of the galactic cosmic ray (GCR) spectrum. Dosimeters from twelve different laboratories in nine countries were irradiated under identical conditions to four heavy ion beams using the Heavy Ion Medical Accelerator in Chiba (HIMAC).

  Proton microbeam is a powerful tool for two-dimensional elemental analysis. The analysis is based on Particle Induced X-ray Emission (PIXE) and Particle Induced Gamma-ray Emission (PIGE) techniques. The paper outlines the principles and instruments, and describes the dental application has been done in JAERI Takasaki.

  A high-energy x-ray computed tomography system and x-ray CT data handling software have been developed for digital engineering; internal dimension measurement, density analysis, actual & designed shape comparison, STL file generation, and support for reverse engineering and rapid prototyping. The system is designed to collect accurate images in a short scanning time (10s per section) using a MeV-energy electron linear accelerator and highly sensitive semiconductor detectors in order to scan large objects made of aluminum and /or iron. An excellent environment in digital engineering is provided by the software products; “StereoCooker” for 3D bitmap CAD (rendering, feature extraction, dimensional measurement, and shape comparison, etc.), “FeatureMaker” for translating bitmap CT data to CAD data including feature information, and “Wingware” for realizing an Windows PC cluster system “WINGluster” to apply CT data analysis.

We have been developing radiation detectors using cadmium telluride (CdTe), which has the high radiation absorption characteristic. The image pickup tube using polycrystalline CdTe thin film has been developed at the first stage. Furthermore, the X-ray imaging line sensor with high scanning speed and the radiation spectrometer with thermo-electric Peltier cooler were developed by using CdTe single crystal, which has high electric charge collection characteristics. At present, the energy discriminating photon counting radiation line sensors are developing. In this presentation, the feature of the detector using CdTe and their applications are described using examples of development until now.