Experimental Study On The Conformity Efficiency Of All-powerful Peak Of Body Source Based On Point Source Simulation Method

The ¹³N monitoring technology based on energy spectrum conformity has the advantage of low lower limit of measurement compared with the ¹³N monitoring instrument now used in nuclear power plant.The detection efficiency is an important parameter of ¹³N monitoring technology based on energy spectrum conformity.Monte Carlo simulation and experimental measurement are usually used to obtain the detection efficiency.Monte Carlo simulation can accurately simulate the detection efficiency after giving the relevant parameters,but the parameters of the actual detector can not be exactly the same,there will be some deviation,the experimental measurement method needs to use standard source,but some source items such as ¹³N because the half-life is too short to make the standard source,which makes it difficult for the experimental method to obtain the detection efficiency.In order to find a convenient and feasible method to obtain the detection efficiency,the point source simulation method is used in this paper Using ²²Na instead of ¹³N,the experimental study of body source compliance detection efficiency was carried out,and the desired results were obtained.The main contents of this project are as follows:The theoretical model consistent with the detection efficiency is established;Since the acquisition of as many compliance counts as possible is based on the requirements of the ¹³N monitoring techniques consistent with the energy spectrum,the GEANT4 software was used to simulate the compliance detection efficiency of six sampling containers of different sizes,and the regularity of the compliance count?depending on the conformity detection efficiency and the volume product of the sampling container?and the volume change of the sampling container was obtained;The measurement system needed by the experimental research institute was built and the model of sampling container was designed to facilitate the experiment;Through the experimental measurement of the four dimensions mm the vessel diameter 290,300,350 and 400,the body source of the four conditions is obtained to meet the detection efficiency,and the variation law of the volume of the counting and sampling container is obtained.After comparing with the simulation results,the maximum deviation is 9.2%.As a regular calibration method based on energy spectrum consistent with 13 N monitor,the method is feasible.