Production of He-4 and (4) in Pb-Pb collisions at root(NN)-N-S=2.76 TeV at the LHC

Results on the production of He-4 and (4) nuclei in Pb-Pb collisions at root(NN)-N-S = 2.76 TeV in the rapidity range vertical bar y vertical bar <1, using the ALICE detector, are presented in this paper. The rapidity densities corresponding to 0-10% central events are found to be dN/dy4(He) = (0.8 +/- 0.4 (stat) +/- 0.3 (syst)) x 10(-6) and dN/dy4 = (1.1 +/- 0.4 (stat) +/- 0.2 (syst)) x 10(-6), respectively. This is in agreement with the statistical thermal model expectation assuming the same chemical freeze-out temperature (T-chem = 156 MeV) as for light hadrons. The measured ratio of (4)/He-4 is 1.4 +/- 0.8 (stat) +/- 0.5 (syst). (C) 2018 Published by Elsevier B.V.Peer reviewe

Environmental Radioactivity Monitoring and Measurements: Radon and Thoron

We &ldquo;bathe&rdquo; in radiation, which is an integral part of our environment [...

Surveys in China and India & Radon and thoron levels in high background radiation area of Orissa, India

The 2nd JST Meeting & The 7th International Conference on High Levels of Natural Radiation and Radon Area

RADIF- NIRS System for Measurement of Radon Diffusion in Membranes

The new system for measurement of radon diffusion constant in membranes (RADIF) is established at the National Institute of Radiological Sciences (NIRS), Japan.The RADIF system consists of several components: two AB-5 radiation monitors (uses proven photomultiplier tube (PMT) technology) connected to source and receiver chambers, with volume of 30 and 100 dm3, respectively, ceramic radon source and AlphaGUARD device for radon monitoring outside chambers as well as environmental parameters registration.The permeability of membranes is measured according to the ISO norm and method entitled "Determining the radon diffusion coefficient under stationary conditions established during ventilation of the receiver container" (ISO/WD 11665-10). Under this condition the radon concentration in the source container is stable whereas the radon increases in the receiver container. Finally, the permeability (diffusion coefficient) of the investigated membrane is derived using one-dimensional stationary radon diffusion described by the differential equation.Moreover, due to relatively large volumes of both containers (source and receiver) the investigation of diffusion process in relation to changeability of environmental parameters (humidity and temperature) is also possible.7th International Conference on Protection Against Radon at Home and at Wor