Gamma Background Measurements at BEO Moussala

TL;DR

This study measures gamma radiation background at high altitude Moussala using various detectors, compares results with previous data, and estimates cosmic ray contributions through detailed Monte Carlo simulations.

Contribution

It provides new gamma background measurements at Moussala with multiple instruments and introduces a numerical model to estimate cosmic ray contributions.

Findings

Gamma background levels are quantified at 2925m altitude.

Comparison shows consistency among different measurement devices.

Cosmic rays contribute significantly to the gamma dose rate at high altitude.

Abstract

Recent measurements of radiation gamma background at high mountain altitude, namely at Basic Environmental Observatory Moussala (42{\deg}10' 45" N; 23{\deg} 35'07"E, 2925m a.s.l.) are carried out. The measurements are fulfilled with several different devices, namely IGS-421 gamma probe and MDU Liulin spectrometer. The used instrumentation with their characteristics is described. The obtained results are compared with previously obtained measurements carried out with NaI SAPHYMO gamma probe. In addition the measurements are compared with TLD data. The obtained results from measurements are widely discussed. The contribution of galactic cosmic rays to dose rate is estimated on the basis of a numerical model. The model is based on a full Monte Carlo simulation of cosmic ray induced nuclear-electromagnetic-muon cascade in the atmosphere. The simulation is carried out with CORSIKA 6.52 code using FLUKA 2006 and QGSJET II hadron interaction models. The application of the model is briefly discussed.