Radiation doses received by astronauts outside of the geomagnetic field are a main risk factor for human space exploration. The radiation sources of concern are Galactic Cosmic Rays and Solar Particle Events. The charged particles interact with spaceship materials and even with the astronaut body and produce neutrons. Inside the geomagnetic field Galactic Cosmic Rays interacting with atoms in...
The ability to protect astronauts from harmful radiation particles is critical for future human exploration missions beyond ISS. Active dosimeters with demanding specifications concerning mass, power consumption and local intelligence are required to support crew autonomy for operational decisions related to radiation hazards. Important progress in the direction of active dosimetry is being...
The European Spallation Source, presently under construction at Lund (Sweden), will consist of a 537 m long linear proton accelerator delivering a 2 GeV proton beam with a 5MW power to a tungsten target, equipped with a highly optimised neutron moderator capable of providing a bi-spectral (thermal and cold) neutron beam to 42 beam ports, 22 of which are followed by a flight path leading to...
Precision measurement of the energy and the direction of gamma-rays plays a key role in many fields such as medical imaging, nuclear spectroscopy, and astrophysics. Present space gamma-ray telescopes are mainly based on large arrays of detectors which are expensive, necessarily complex, and take long time to build. A different approach is the use of detector with similar energy and direction...
Radiation portal monitor systems have been deployed to monitor the inflow or outflow of illegal radionuclides at border crossings world widely. Large-sized plastic scintillation detector has been commonly used for RPM system, but due to the components of the plastic scintillator are carbon and hydrogen, which are low Z-number material, it has poor energy resolution that shows the broad Compton...
Proper choice of contact material leads to reduction of leakage current, increase of X-ray penetration coefficient, when so-called transparent contacts are used, and increase of noise to signal ratio [1].
This work is dedicated to investigation of quasi-ohmic contacts behavior in the system “Me-GaAs:Cr-Me”. AuGe metallization was made by means of electron-beam deposition. Chromium compensated...
