MONTE-CARLO SIMULATIONS FOR ESTIMATION OF THE RADIATION ENVIRONMENT AROUND THE MODERNIZED NUCLOTRON

G. Timoshenkoª, M. Paraipan, B. Florko, L. Zaitsev

Joint Institute for Nuclear Research, Dubna, Russia

Abstract

The essential condition of the NICA (Nuclotron-based Ion Collider fAcility) project implementation is designing an appropriate radiation shields of its structural units, first of all – the upper shield of the Nuclotron tunnel. The crucial point determining the NICA shielding design is indispensable condition to keep the yearly equivalent dose < 1 mSv on the border of the Laboratory site. The radiation situation around the NICA will be formed by neutrons escaped from the shielding of the NICA radiation sources and multiscattered in air and ground ("skyshine" neutrons).

The calculations of the "skyshine" neutron radial distributions around the modernized Nuclotron at the acceleration of protons (12 GeV), ¹²C (6 GeV/n), ²³⁸U (3.5 and 4.5 GeV/n) and uniformly distributed along the accelerator ring beam losses are presented for different situations. The calculations have been carried out by the FLUKA and GEANT4 codes for the simplified model of the accelerator placed within the synchrophasotron tunnel. The verification of the codes with available experimental data on double differential neutron yields from the thick Fe target irradiated with 1 GeV/n uranium nuclei has been done previously and shown the satisfactory agreement between the simulations and experiment.

The calculation of the NICA booster local shields (in the synchrophasotron linear spaces) at the acceleration of uranium nuclei to energy 0.5 GeV/n has been carried out as well.

The variant of the Nuclotron shielding design with the use of the synchrophasotron magnet element is proposed.

ª – corresponding author

Paper Slides

392 

SYSTEM FOR THE RADIONUCLIDE DIAGNOSTICS

A.V. Stepanovª, M.F. Vorogushin

Federal State Unitary Enterprise Efremov Scientific Research Institute of Electrophysical Apparatus, Saint-Petersburg, Russia

Abstract

One of the main problems of the clinical medicine is to make a timely diagnosis of a decease. Compared to many other examination methods, the radionuclide diagnostics provides most complete and reliable information on pathologies; this method is characterized with a high sensitivity, high-speed analysis and a painless process of patients' examination. The high sensitivity of the radionuclide diagnostics allows a disease to be identified at the initial stage, which is very important for successful treatment. The unique specific feature of the radionuclide diagnostics is a possibility for choosing the most proper procedure of treatment and control of the treatment process.

ª – corresponding author

Paper 

388