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Design and Construction of a Densitometer Tool and Simulation of its Performance by the Mcnp Code and Comparison of the Obtained Data with Experimental Results

Shabani, Ali | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44195 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering Nuclear
  6. Advisor(s): Sohrabpour, Mostafa
  7. Abstract:
  8. In this Thesis, a nuclear borehole logging tool has been designed and constructed for measuring the bulk density of a formation by the use of gamma rays. One of the main applications of this tool is obtaining of porosity. It also is useful in the detection of formations containing oil and gas. This tool consists of: a gamma ray source 60Co, a single gamma ray detector NaI(Tl), lead shield and electronic modules. The cylindrical sond is entered into a borehole and the surrounding formation is subjected to the emitted gamma rays from the source. The formation density can be determined from the measurement of the scattered photons reaching the detector from the formation. The purpose of the shield is to block the source-energy gamma rays from reaching the detector. The designed and constructed electronic modules used for the setup of the system were, Pre-Amplifier, Pulse-Shaping Amplifier, Single Channel Analyzer, Power Supply, Controller, Counter and Serial Interface. All the above units were installed in a Stainless Steel Cylindrical Container.In this work, MCNP Monte Carlo code was used to simulate the performance of the scattered gamma rays under various sonde-formation parametric conditions. These conditions included shield thickness selection, source to detector distance optimization and the density variation on the system response function. The depth of investigation and a calibration curve were also obtained for the sonde system.Practical experiments were performed by using two boreholes which consisted of two materials with different densities. In order to determine densitometer’s calibration curve, the sonde was entered into each boreholes and the number of counts were determined in a predefined energy range for each of the boreholes
  9. Keywords:
  10. Electronic Circuits ; Monte Carlo N-Particle (MCNP)Code ; Detector ; Densitometer Probe ; Gamma Ray Detector ; Calibration Curve ; Densitometer Tool

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