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| The nuclear material level gauge with approximate linear scale is realized by the numerical analysis method. In this paper, according to the real project design a theoretical calculation model, using the multipoint combination source and single detector measurement scheme. Referencing the line-source design method, calculate the multipoint combination source activity which satisfy the measurement range and accuracy requirement, and through the Excel and Matlab software complete the data calculation and dispose, drawing out the count rate - material level diagram. According to the nonlinear measurement, use the equivalent point source method, compensating the bottom source activity and residual analysis method , revise the gauging nonlinear separately. Finally complete the theoretical design of multipoint source nuclear material level gauge with the total source activity of 633mCi, measurement range 80cm, 5mm measurement precision and response time 14-33S.Through the protective calculation, do the comprehensive analysis for the three ways, confirm the residual analysis as the best design scheme. |
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| Keywords:nuclear gauge; multi-point source; two-point standardization; nonlinear correction; numeric analysis; linear output; shielding calculationrd 3 |
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