In this paper we describe a neural network-based method aimed at automatically calibrating the detector module contained in a scanner for a highresolution positron emission tomography (PET) system for small animals. The detector module is composed of crystal elements, arranged in a regular matrix and sensitive to gamma rays emitted by a radioactive source. The crystal matrix is optically couple...

2014 It has been shown recently that fast heavy ions can induce a mild desorption of organic molecules deposited on a thin foil, when passing through the foil. A time of flight mass spectrometer, originally developed to identify the mass of radioactive nuclei, has been slightly transformed to allow the determination of the mass of large molecules. The desorption of the molecules is at the prese...

Modelling of the radioactive ion beam (RIB) targets at TRIUMF has suggested that rotating the high energy proton beam in a circle on the face of the target may provide a greater source of radioactive ions than a static incident beam. To explore this idea a system has been configured to allow the beam of protons in the primary beamline to be steered in a circle and to permit various parameters t...

Introduction/Background Over the last 2 decades, significant technical advancements have improved the delivery of prostate brachytherapy. The transrectal ultrasound-guided implant technique is the backbone of modern prostate brachytherapy. Whether it is permanent or temporary, ie, low-dose-rate (LDR) or high-dose-rate (HDR), respectively, both use similar image-guided techniques for inserting s...

Poisson statistics were studied using the radioactive decay of Cs as a source. A scintillation counter measured gamma rays emitted by Cs as well as background from cosmic rays and other experiments in the laboratory. Data from approximate mean rates of 1, 4, 10 and 100 counts/sec was compared to both theoretical Poisson distributions and Monte Carlo simulations. The reduced chi squared values f...

When cells of Pseudomonas are grown on citrate as the sole carbon source they oxidize citrate and isocitrate rapidly. Fluorocitrate inhibits the oxidation of citrate. Fluorocitrate-treated cells accumulate [6-(14)C]citrate, as shown by a rapid Millipore-filtration technique. In the absence of fluorocitrate most of the [6-(14)C]-citrate is lost in the form of (14)CO(2). The isolation of a pseudo...

The “science fact” section of the March 1965 issue of Analog magazine featured an article by Richard P. McKenna that proposed a “motor” which would consist of a solenoid magnet that can rotate about its axis, plus a radioactive source mounted on that axis [1]. When a charged particle is emitted by a radioactive decay it traverses the solenoid field, which bends the particle’s trajectory, giving...

Air filter samples collected at Sodankylä (6722’N, 2639’E) were analyzed for determining concentrations of Cs, Sr and total beta in surface air at northern Finland during 1963. Activity concentrations of Cs, Sr and total beta varied seasonally being highest in spring and summer, due to enhanced transportation of aerosols containing radioactive particles from stratosphere to troposphere during w...

A tremendous amount of radioactivity was discharged because of the damage to cooling systems of nuclear reactors in the Fukushima No. 1 nuclear power plant in March 2011. Fukushima and its adjacent prefectures were contaminated with fission products from the accident. Here, we show a geographical distribution of radioactive iodine, tellurium, and cesium in the surface soils of central-east Japa...