Investigation on Radiation Shielding Properties of Special Concrete in Neutron Fields

Abstract

This paper presents the results on radiation shielding of special types of concrete, designed for nuclear reactor containments. The research focused on the study of shielding properties against neutron component of ionizing radiation. For this purpose, two types of ionizing source were used: the isotopic reference neutron field of 239Pu-Be in calibration laboratory and the MARIA Research Reactor.

Out-of-field doses for scanning proton radiotherapy of shallowly located paediatric tumours—a comparison of range shifter and 3D printed compensator

“…The REM-2 is a chamber with a tissue equivalent electrodes filled with tissue equivalent gas mixture, classified as a recombination chamber. Because the REM-2 chamber approximates dosimetric parameters of the ICRU sphere (dose contribution and energy spectrum of secondary charged particles at depth of 10 mm), H * (10) can be determined for mixed radiation fields (neutrons and photons) (Zielczyński et al 2008, Caresana et al 2014, Murawski et al 2018. To subtract the photon dose component, the twin-detector method was used (Golnik et al 2014) and as a companion to REM-2 the GW2 ionization chamber with aluminium electrodes and filled with CO 2 was chosen.…”