Study on the Sources and Correction Factors of Measurement Uncertainty for Primary Standard Graphite Calorimeter System

Autor: Yu-Chun Tai, 戴于鈞
Rok vydání: 2015
Druh dokumentu: 學位論文 ; thesis
Popis: 103
The main aim of this thesis is to investigate the sources of measurement uncertainty and the correction factors of the primary standard graphite calorimeter, which is co-developed by Institute of Nuclear Energy Research, Atomic Energy Council, Executive Yuan and our research lab. To extend the research works of previous thesis entitled “A study on the estimation of measurement uncertainty of primary standard graphite calorimeter system”, we perform the experiment about Co-60 absorbed dose by the primary standard graphite calorimeter, analyze the measurement uncertainty of the experiment data, and then calibrate the measurement dose rate with some correction factors. It is expected that the difference between the calibrated measurement data and the current standard of absorbed dose by water would be less than 1% so that the graphite calorimeter could meet the requirement of national primary standard. According to the analyses of the measurement data obtained from the current graphite calorimeter version, the difference between the original measurement data and the current standard of absorbed dose by water is 3.028%. The result has met the expected aim, with difference less than 5%, of the project performed by 2014. In this thesis, we further calibrate the measurement data with the correction factors, including vacuum gaps,core impurity, axial nonuniformity, radial nonuniformity, heat defect, conversion from graphite to water, and power consumption on the leading wires. The difference between the calibrated measurement data and the current standard of absorbed dose by water has reduced to be 1.5418%. Obviously, it approaches to the expected aim, with difference less than 1%, of the project performed by this year.
Databáze: Networked Digital Library of Theses & Dissertations
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