METHOD FOR MONITORING DENSITY OF RADON UNDISTURBED FLOW FROM THE GROUND

摘要

FIELD: measurement equipment.;SUBSTANCE: method for monitoring the density of the undisturbed stream of radon from the soil surface includes the steps of performing registration of alpha radiation radon decay products accumulated inside mounted on the surface of the soil collection chamber, in which the body has holes for the partial release of the soil gas. Preliminary on-site storage chamber produces radon flux density measurement and thoron by a radiometer, determine the number of pulses from Thoron and alpha-emitting daughter products of its decay N_Tn. Then set the storage chamber to the soil surface and produce a continuous sequence of measuring the number of pulses with a duration of one measurement τ from 60 to 900 s the collection chamber fastened alpha scintillation detector sensitive surface of which is not less than 0.10 m above the ground surface, define a correction factor K_Rn for the pulse count rate from the transfer of radon and alpha-emitting daughter products of its decay in units of radon flux density, and radon flux density is determined by the expression: where q_Rn(t) - flux density of radon from the ground surface at time t, Bq m^-2 s^-1; K_Rn - correction factor (Bq m^-2 s^-1)/(Imp.s^-1);N_Rn Tn(t) - the total number of registered for the duration of one measurement τ pulses of radon, thoron and alpha-emitting daughter products of decay in the time t, imp.; N_Tn - the number of pulses from Thoron and alpha-emitting daughter products of its decay for the duration of one measurement τ, imp.; τ - the duration of one measurement, s.;EFFECT: simplification of the method of monitoring, improving the reliability of the results.;3 dwg