Investigation on natural penetrating radiation along the Qinghai-Tibet Railway
Objective To investigate the natural penetrating radiation levels along the Qinghai-Tibet Railway,and to pre-liminarily evaluate the doses received by the railway employees and passengers.Methods Natural penetrating radiation was measured at 15 typical locations with different altitudes along the railway and in the carriages of a train from Lhasa to Xining using high-pressure ionization chamber RSS131,sodium iodide radiation dose rate meter MARS1561,and neutron ambient dose equivalent rate meter LB6411.Results The levels of terrestrial gamma radiation,cosmic ray ionization com-ponents,and neutron radiation were 21.5-246.6 nGy/h,79.8-225.5 nGy/h,and 24.5-101 nSv/h,respectively.The effective dose of natural penetrating radiation received by passengers and crew on a train from Lhasa to Xining was 4.82 μSv.Conclusion Comparison with the empirical formula and verification of method reliability confirm the accuracy of the measurement.Our results provide a primary understanding of the radiation levels along the Qinghai-Tibet Railway and the radiation doses received by passengers,which can be used as a basis for the regulatory authorities.
Qinghai-Tibet RailwayNatural penetrating radiationCosmic ray ionization componentNeutronTerrestrial gamma radiation
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