A 68 Ge source can be used to calibrate the positron detection eeciency of a liquid scintillation neutrino detector. A method to dissolve radioactive 68 Ge in pseudocumene-based liquid scintillator is described. The homogeneity of the source distribution has been studied and results for two Ge compounds are discussed. Light yield and light attenuation length of the liquid scintillator are not a...

Abstract The TRISTAN project is the upgrade of KATRIN experiment designed for search sterile neutrinos by replacing current detector with a multipixel SDD (Silicon Drift Detector) matrix. We have characterized SDDs response to electrons using SEM (Scanning Electron Microscope) as an electron source and Geant4-based simulation whose output processed empirical function reproduce data. crosschecke...

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...

In a recent discussion relating to environmental health, Mark D. Hollis (1) indicated that public health officials will be responslible for protecting the population against the harmful effects of ionizing radiation. Ionizing radiations result from the disintegration of unstable nuclei and are damaging to living tissue. The radiation may originate from an external source or from radioactive mat...

Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A. BEARS is an ongoing project to provide a light-ion radioactive-beam capability at the 88-Inch Cyclotron at LBNL. Light radioactive isotopes are produced at a 10 MeV proton medical cyclotron, transported 350 m via a high-speed gas transport capillary, cryogenically separated, and injected into the 88-Inch Cyclotron’s ion source. T...

introduction: brachytherapy is a type of radiotherapy in which radioactive sources are used in proximity of tumors normally for treatment of malignancies in the head, prostate and cervix. materials and methods: the cs-137 selectron source is a low-dose-rate (ldr) brachytherapy source used in a remote afterloading system for treatment of different cancers. this system uses active and inactive sp...

UNLABELLED This study investigates the ability of artificial neural networks (ANN) to simultaneously correct for attenuation and Compton scattering in scintigraphic imaging. METHODS Three sets of experiments are conducted using images of radioactive sources with various shapes and distributions in a homogeneous medium. Numerical Monte Carlo simulations and physical phantom acquisitions of rad...

Radioactive sources exist in environments or contexts that influence how they are detected and localised. For instance, the context of a moving source is different from a stationary source because of the effects of motion. The need to incorporate this contextual information in the radiation detection and localisation process has necessitated the integration of radiological and contextual sensor...