[en] Results are presented for a comparison of nuclear decay data for internal dosimetry derived from the recent Evaluated Nuclear Structure Data File (ENSDF) with those given in ICRP Publication 38. In most nuclides, values of half-life, branching fraction and total energy of radiations calculated from the ENSDF were in good agreement with those of Publication 38. However, significant differences in these values were found for several nuclides, notably ⁶⁰Fe, ⁷⁹Se, ⁸⁰Sr, ¹⁰⁸Ag^m, ¹²⁶Ba, ²⁰²Pb, and ²³¹Th. The causes of the differences were examined, and the influence of the revision of the nuclear decay data on the values of dose coefficients was evaluated for the selected nuclides. (author)

[en] This book presents papers on high energy physics. Topics covered include magnetic monopoles; spontaneous breakdown of supersymmetry in two dimensions; search for slow monopoles and quarks; and supergrand unification in subquark physics and pregeometry

No abstract available

[en] Some data were derived using recent sophisticated methods to rapidly convert specific activity of induced ²⁴Na to average dose over a whole body in criticality accidents. Monte Carlo calculations using the MCNP-4B code were performed to study energy spectra of neutrons and gamma rays for some criticality systems with fissile uranium. Absorbed dose to human body and the activation of sodium were also analysed against external radiation by simulations using a MIRD-5 type phantom and the calculated energy spectra. It was found that the neutron dose assessment from induced ²⁴Na would be important to give medical staff initial guidance for treatment of a victim. However, the energy distribution of incident neutrons to the human body did not significantly influence the conversion from the specific activity of ²⁴Na to dose from gamma rays induced within a body. Analyses were made to clarify the dependence of conversion from ²⁴Na specific activity to neutron dose on the orientation toward the source and the size of the human body. The total dose estimated based upon the obtained data ranged from 33 mGy to 514 mGy for a given specific activity of 1.4 kBq ²⁴Na per g ²³Na for some criticality assemblies. This study suggested that the size of uranium solution and material around the fuel should be defined to properly estimate the total dose, including the dose from external photons. (author)

[en] On-going JAERI's project for empirical evaluation of the ecological interface design concept was first described. The empirical evaluation is planned to be proceeded through three consecutive steps; designing and actual implementation of the interface on reactor simulator, verification of the interface created, and the validation by the simulator experiment. For conducting the project, three different experimental resources are prerequisite, that are, data analysis method for identifying the operator's strategies, experimental facility including reactor simulator, and experimental subjects or subjects training method. Among the three experimental resources, subjects training method was recently designed and a simulator experiment was earned out in order to examine the feasibility of the designed training method. From the experiment and analysis of the experimental records, we could conclude that it is feasible that the experimental subjects having an appropriate technical basis can gain the sufficient competence for evaluation work of the interface design concept by using the training method designed. (author)

[en] The present paper discusses the technical issues and a scheme for their resolution before undertaking the development of a new radioactive decay database to succeed ICRP38. The scheme consists of the following procedures. (1) The consistency of nuclear structure data files used as input to the computer code EDISTR is established by referring to the latest nuclear parameters and by comparing the computed energies of emitted radiations with total decay energy. (2) A method for calculating detailed spectra of X rays and Auger electrons is incorporated into EDISTR to enhance the treatment of atomic relaxation processes initiated by electron vacancies from internal conversion and electron capture. (3) Quality assurance of the compiled data is undertaken by comparisons with experimental data and other decay databases prepared from different computer codes and libraries. JAERI and ORNL are cooperating to implement the scheme in order to assemble a comprehensive radioactive decay database including over 1000 nuclides. (author)

[en] The upper critical field and magnetization of the Chevrel phase GdMo₆Se₈ have been determined from a detailed analysis of measurements on a series of samples which include various amounts of impurity phases. The samples were prepared by sintering mixtures of Mo, Se and an excess of Gd. The electrical resistivity and magnetization of these samples were measured in magnetic fields of up to 70 kOe and at temperatures down to 0.5 K. From the magnetization it was determined for GdMo₆Se₈ that the Neel temperature Tsub(N) = 0.95 K and the Curie-Weiss temperature theta = -0.8 K. A kink in the temperature dependence of the upper critical field was observed at 0.85 K, and the superconducting transition temperature Tsub(s) was found to be 5.4 +- 0.2 K. (author)

[en] MgB₂ single crystals with a sharp transition width (ΔT_c∼0.3 K) were grown by the ambient-pressure synthesis. The upper and lower critical fields, H_c2 and H_c1 were evaluated from the magnetization for the applied field μ₀H≤5 T parallel to the three crystallographic directions. The coherence length ξ and the penetration depth λ for each direction were deduced from these critical fields with a little assumption for H_c1. The anisotropy ratio γ_H=ξ_c/ξ_ab was estimated to be ∼6.5 at 2.5 K and ∼2.3 near T_c (=37.6 K), and γ_λ=λ_c/λ_ab(=3.0±0.2) to be almost constant over the range 2.5 K≤T< T_c

[en] Fluence to organ dose and effective dose conversion coefficients have been calculated for electrons from 1 MeV to 100 GeV using an anthropomorphic phantom and the EGS4 code. The conversion coefficients were calculated for six typical irradiation geometries taking electromagnetic cascade shower and photonuclear reactions into account. The contribution to the absorbed dose due to the photonuclear reactions in energies up to 140 MeV was evaluated to be less than 0.2%. Even at energies above 140 MeV the dose contributions of the photonuclear reactions were insignificant. (author)

[en] Spin wave excitations in an itinerant electron antiferromagnet Cr₂As was measured using neutron spectroscopy. Magnon dispersion is linear to the reciprocal lattice vector for small q, and the slope is 125 and 185 MeV A along c- and a-axis, respectively. The slope is about two times larger than the value predicted from the molecular field theory