The two radionuclides most commonly used for intra-articular therapy are '98Au and 90Y. Both emit #-radiation, which is absorbed within a small distance from the site ofemission in tissue. The decay of 198Au is also accompanied by y-radiation, which can be detected from outside the body using a scintillation detector. 90Y, however, has no y-emission, but its presence can be detected from outsid...

The features of electromagnetic processes are considered which connected with finite size of space region in which final particles (photon, electron-positron pair) are formed. The longitudinal dimension of the region is known as the formation length. If some external agent is acting on an electron while traveling this distance the emission process can be disrupted. There are different agents: m...

The Relativistic Electron Facility for Education and Research (REFER) at Hiroshima University accepts a 150 MeV electron beam from a microtron, the injector to the 700 MeV storage ring of the Hiroshima Synchrotron Research Center, and keep it circulating for 2.5ms without a RF acceleration. It acts as a beam stretcher and has been used for the following researches: 1) X-ray generation from an i...

a male patient in his 20s presented at our clinic with pain caused by bone metastases of the primitive neuroectodermal tumor, and sr-89 was administrated to palliate the pain. after receiving the injection, the patient complained of a slight burning pain at the catheterized area. slight reddening and small circular swelling (diameter, 0.5 cm) were observed at the catheterized area. sr-89 extrav...

The EGS4 electron-photon Monte Carlo code has been used to study the characteristics of the bremsstrahlung x-rays generated from the interaction of circulating electrons with the residual gas in accelerator storage rings. Gas bremsstrahlung dose rates are given for various opening angles as a function of the electron beam energy ranging from 0.510 GeV. Photon and neutron dose rates, generated f...

We use three-dimensional smoothed particle hydrodynamics simulations together with a dynamical ray-tracing scheme to investigate the build-up of the first H ii regions around massive Population III stars in minihaloes. We trace the highly anisotropic breakout of the ionising radiation into the intergalactic medium, allowing us to predict the resulting recombination radiation with greatly increa...

Neutrino-pair bremsstrahlung radiation is considered due to electron–phonon scattering of degenerate, relativistic electrons in a lattice of spherical atomic nuclei in a neutron star crust. The neutrino energy generation rate is calculated taking into account exact spectrum of phonons, the Debye–Waller factor, and the nuclear form–factor in the density range from 10 g cm to 10 g cm at arbitrary...