Background: The characteristics of secondary neutrons in a high energy radiation therapy room were studied using the MCNPX Monte Carlo (MC) code. Materials and Methods: Two MC models including a model with full description of head components and a simplified model used in previous studies were implemented for MC simulations. Results: Results showed 4-53% difference between full and wit...

as a result of being hydrogenous moderators, several landmine detection methods based onnuclear techniques have been suggested in recent years. because of elastic scattering and moderating neutrons from hydrogen atoms in landmines, detection of backscattered neutron shows an anomaly in the reflected thermal neutrons count when a detector scans over a mine. on landmine detection using neutron so...

Introduction: This study aimed to measure the neutron contamination of flattening filter (FF) and flattening filter-free (FFF) 10-MV photon beams delivered by the Elekta InfinityTM accelerator. Material and Methods: The photoneutron spectrum produced by the Linac head was evaluated using a Monte Carlo (MC) simulation. The geometry ...

2.1. X-ray Based Detection Systems: 11 2.2. Elements of Neutron Physics and Properties: 13 2.3. Gamma Spectroscopy Neutron Based Techniques: 14 2.3.1. Thermal Neutron Analysis (TNA): 17 2.3.2. Fast Neutron Analysis (FNA): 19 2.3.3. Pulsed Fast Neutron Analysis (PFNA): 19 2.3.4. Pulsed Fast-Thermal Neutron Analysis (PFTNA): 20 2.3.5. Associated (Alpha) Particle – Time-of-Flight Neutron Analysis ...

Background: High density concrete is extensively used for efficient radiation attenuation in radiotherapy rooms and nuclear reactors. Over the past eight years, some efficient galena-based concrete samples for shielding X or gamma rays was produced. The goal of this study was to produce a novel high density concrete against neutron and photon radiations using tourmaline and galena. Materials an...

high spin states in the neutron rich nucleus 191os has been populated for the first time using the82se+192os deep-inelastic reaction at 460 mev beam energy using the alpi accelerators at the laboratorynazionali di legnaro, italy. high fold γ-γ coincidences were acquired with the 4π spectrometer gaspdetector array, consisting of 40 compton-suppressed, large-volume germanium detectors with an inn...

compound-nucleus reactions provide the standard mechanism to populate states with high angularmomentum in neutron deficient nuclei. neutron-rich nuclei with mass aand induced fission. projectile fragmentation has proven to be an efficient method of populating nuclei farfrom the valley of stability. however, in the case of heavy nuclei this method is still limited to species withisomeric states....

A new phase of ice, named ice XV, has been identified and its structure determined by neutron diffraction. Ice XV is the hydrogen-ordered counterpart of ice VI and is thermodynamically stable at temperatures below approximately 130 K in the 0.8 to 1.5 GPa pressure range. The regions of stability in the medium pressure range of the phase diagram have thus been finally mapped, with only hydrogen-...