Improvement of the passive efficiency calibration of the segmented gamma scanner
-
S. Hou
,
J. Luo
Abstract
The Segmented Gamma Scanner(SGS) technology is specially used for type identification and activity quantitative analysis of radioactive material in sealed containers, which mainly divided into the transmission measurement and the emission measurement. In actual measurement process, it cannot meet the need for rapid analysis because the efficiency calibration time takes up more than 60% of the whole detect time in the data analysis. Whereas most previous research have focused on theory or specific applications, this research groups aim to different aspects of the SGS technique and direct it at an audience with interests in the need for rapid analysis. The Monte Carlo simulation calculation models were established by the passive efficiency calibration method, and then the detection efficiency database was carried out based on the experimental verification. Lots of work was used to analysis the influence of crosstalk between layers and interpolation step. Furthermore, the database was implanted into the control and analysis system to complete the measurement experiments. The results show the measuring time of single waste drums is about 30 min, and the average relative deviation is less than 10%, so the problem that the time taken to calibrate the detection efficiency is too long has been solved effectively. The efficiency in the use of SGS technology has been increased.
Kurzfassung
Die segmentierte Gamma-Scanner (SGS) -Technologie wird speziell für die Typidentifikation und die quantitative Aktivitätsanalyse von radioaktivem Material in verschlossenen Behältern verwendet. Diese besteht hauptsächlich aus der Transmissionsmessung und der Emissionsmessung. Im tatsächlichen Messprozess erfüllt sie allerdings nicht den Bedarf an einer schnellen Analyse, da die Zeit für die Effizienzkalibrierung mehr als 60% der gesamten Detektionszeit in der Datenanalyse in Anspruch nimmt. Während sich die meisten früheren Forschungen auf die Theorie oder spezifische Anwendungen konzentrierten, zielt diese Forschungsgruppe auf verschiedene Aspekte der SGS-Technik ab und richtet sich an ein Publikum, das an der Notwendigkeit einer schnellen Analyse interessiert ist. Die Berechnungsmodelle der Monte-Carlo-Simulation wurden durch die Kalibrierungsmethode der passiven Effizienz erstellt, und dann wurde die Datenbank der Erfassungseffizienz auf der Grundlage der experimentellen Verifizierung durchgeführt. Es wurde viel Arbeit investiert, um den Einfluss des Übersprechens zwischen den Schichten und des Interpolationsschritts zu analysieren. Außerdem wurde die Datenbank in das Steuerungs- und Analysesystem implantiert, um die Messexperimente zu vervollständigen. Die Ergebnisse zeigen, dass dieMesszeit für ein einzelnes Abfallfass etwa 30 Minuten beträgt und die durchschnittliche relative Abweichung weniger als 10% beträgt, so dass das Problem, dass die Zeit für die Kalibrierung der Erfassungseffizienz zu lang ist, effektiv gelöst wurde. Die Effizienz beim Einsatz der SGS-Technologie wurde erhöht.
Acknowledgements
The authors are grateful to the precious comments made by anonymous reviewers. The authors extend their sincere thanks to The National Nature Science Fund of China Grants Agreement Number 51309228 for the financial support for this work. The authors also thank the Postdoctoral Science Foundation of China for financial supporting this work (No. 2013M542459), and Shaanxi Technology Committee Natural Science Basic Research Project for financial supporting this work (No. 2016JM6026).
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Articles in the same Issue
- Frontmatter
- The simulation research on the natural circulation operation characteristic of FNPP in rolling and inclined condition
- Establishment of analysis methodology of RADTRAD for Maanshan PWR ATWS
- Calendar of Events
- CFD simulation of subcooled boiling flow in PWR 5 ⨯ 5 rod bundle
- Effectiveness assessment of improvement measures in physical protection system monitoring center
- A study on accumulator analysis for the valve performance evaluation system of nuclear power plants
- Calculation studies of coated particles performance in sodium-cooled fast reactor
- Effect of using graphene/water based nanofluid on heat transfer in heat exchangers with rotating straight inner tube
- Radiation shielding properties of mortars containing heavyweight particles
- Improvement of the passive efficiency calibration of the segmented gamma scanner
- Investigation of level density parameter dependence for some 233U, 235U, 237U, 239U, 249Cf, 251Cf, 237Pu and 247Cm nuclei in neutron fission cross sections with the incident energy up to 20 MeV
- Establishment of analysis methodology for ionizing mattresses using RESRAD-BUILD code
- Editorial
