High-power and high-energy proton accelerators have been proposed for basic scientific research in several countries, and some of them are under construction. In Japan, the high intensity proton accelerator (J-PARC), consisting of a 200-MeV Linac as well as 3-GeV and 50-GeV synchrotrons, of which the maximum beam power is about 1MW, is to be completed at the end of 2007. This accelerator was de...

The thermalized energy from the radioactive decays of Ni and Ni and their daughter nuclides power the light curves of supernovae near maximum light. The bolometric light curve gives us a fundamental understanding of the energy evolution of a supernova explosion and the amount of radioactive nuclides produced. In this review, I will discuss the bolometric evolution of the Type IIp supernovae SN1...

INTRODUCTION Radon and its progeny are natural radioactive nuclides and exist in various places on the earth. Some of the radon progeny in air and clouds is transferred into rainwater. It has often been observed that gamma radiation at ground level increases on a rainy day. The increase of natural background gamma radiation disturbs the estimates of the influence of artificial radioactive nucli...

The purpose of this experiment is to explore the relation between the mean lives of alpha-active nuclides and the energies of the alpha particles they emit. You will study portions of the sequences of radioactive transformations whereby uranium is transmuted into lead. Various procedures will be used to measure the alpha-particle energies and lifetimes of five alpha-active nuclides with mean li...

More than 4 years has passed since the accident at the Fukushima Nuclear Power Plant. Immediately after the accident, 40 to 50 academic staff of the Graduate School of Agricultural and Life Sciences at the University of Tokyo created an independent team to monitor the behavior of the radioactive materials in the field and their effects on agricultural farm lands, forests, rivers, animals, etc. ...

An interactive multimedia tool, Nuclides.net, has been developed at the Institute for Transuranium Elements. The Nuclides.net “integrated environment” is a suite of computer programs ranging from a powerful user-friendly interface, which allows the user to navigate the nuclides chart and explore the properties of nuclides, to various computational modules. Through this powerful interface, the u...

membrane assisted liquid extraction(male) technologies are gaining an important role as an extraction /separation technique for actinides and are being deployed as a  promising tool for remediation of nuclear waste generated in the reprocessing plant and other radioactive wastes containing a trace level of radionuclides. the present contribution outlines the classification of membrane assisted ...