Intrinsic Efficiency Calibration Considering Geometric Factors in Gamma-ray Computed Tomography for Radioactive Waste Assay

Conference · Wed Jul 01 00:00:00 EDT 2015

DOI:https://doi.org/10.1109/ANIMMA.2015.7465634· OSTI ID:22531489

Liu, Zhe ^[1]; Zhang, Li ^[2]

---

1. China Institute of Atomic Energy, Beijing 102413 (China)
2. Key Laboratory of Particle and Radiation Imaging, Tsinghua University, Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084 (China)

In radioactive waste assay with gamma-ray computed tomography, calibration for intrinsic efficiency of the system is important to the reconstruction of radioactivity distribution. Due to the geometric characteristics of the system, the non-uniformity of intrinsic efficiency for gamma-rays with different incident positions and directions are often un-negligible. Intrinsic efficiency curves versus geometric parameters of incident gamma-ray are obtained by Monte-Carlo simulation, and two intrinsic efficiency models are suggested to characterize the intrinsic efficiency determined by relative source-detector position and system geometry in the system matrix. Monte-Carlo simulation is performed to compare the different intrinsic efficiency models. Better reconstruction results of radioactivity distribution are achieved by both suggested models than by the uniform intrinsic efficiency model. And compared to model based on detector position, model based on point response increases reconstruction accuracy as well as complexity and time of calculation. (authors)

• Research Organization: Institute of Electrical and Electronics Engineers - IEEE, 3 Park Avenue, 17th Floor, New York, N.Y. 10016-5997 (United States)
• OSTI ID: 22531489
• Report Number(s): ANIMMA-2015-IO-x14; TRN: US16V0529102430
• Resource Relation: Conference: ANIMMA 2015: 4. International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications, Lisboa (Portugal), 20-24 Apr 2015; Other Information: Country of input: France; 3 Refs.
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
42 ENGINEERING
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CALIBRATION
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
COMPUTERIZED TOMOGRAPHY
DIAGRAMS
EFFICIENCY
GAMMA DETECTION
GAMMA RADIATION
MONTE CARLO METHOD
RADIATION DETECTORS
RADIOACTIVE WASTES
RADIOACTIVITY