Haoran ZHANG, Yan ZHANG, Wenxing HU, Jinhui QU, Shiliang LIU, Renbo WANG. Simulation study of uranium content in uranium yellow cake using the active multiplicity method[J]. NUCLEAR TECHNIQUES, 2024, 47(2): 020202
- NUCLEAR TECHNIQUES
- Vol. 47, Issue 2, 020202 (2024)
Fig. 1. Schematic diagram of the active multiplicity method for measuring the total mass of uranium in yellow cake
Fig. 2. FH-NCM/S1 device model established by the MCNP program (a) 2D axis section view, (b) 3D axis section view
Fig. 3. Flow chart of MCNP and MATLAB joint simulation multiplicity analysis flow chart
Fig. 4. fDi versus mass of 238U in the sample
Fig. 5. Diagram of the relationship between multiplicity count rates S/D/T and the change of sample mass
Fig. 6. Relationship between the calculated and actual values of the sample induced fission rate and multiplication with uranium content (a) Sample induced fission rate, (b) Simulated multiplication M and calculated net leakage multiplication ML
Fig. 7. Actual and measured values of the corrected fission rate F and total mass of uranium m(a) Change of sample fission rate F and Fm′ with mass of 238U, (b) Calculated value and actual value of total uranium mass
Fig. 8. Relation diagram of the change of sample S/D rate with water content (a) Single rate S, (b) Double rate D
Fig. 9. Correction curve and double rate before and after correction(a) Correction curve fitting, (b) Double rate before and after correction
Fig. 10. Actual and measured values of total uranium mass in samples with different water contents
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Table 1. Main parameters of FH-NCM/S1
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Table 2. Excitation efficiency and detection efficiency of the fission of yellow cake material excited by 241Am-Li and 241Am-Be
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