Dissertation > Excellent graduate degree dissertation topics show

The Research on Calorimetry of Electron Beams Absorbed Dose Measurement

Author: GongXiaoMing
Tutor: ZhangYanLi
School: China Institute of Metrology
Course: Measuring Technology and Instruments
Keywords: Monte Carlo Simulation EGSnrc Electron beam absorbed dose Calorimetry Percentage depth dose distribution Potassium dichromate ( Silver ) chemical dosimeter
CLC: TL818
Type: Master's thesis
Year: 2010
Downloads: 35
Quote: 0
Read: Download Dissertation

Abstract


With various types of electron accelerators in nuclear medicine, radiation biology and nuclear radiation technology development of civilian industries, how to measure and evaluate the electron beam radiation related physical quantities especially how accurately measure absorbed dose electron beam becomes a very important work. Absorbed dose in the field of radiation processing directly related to product quality control in nuclear medicine, radiation biology, radiation is directly related to the success or failure. Therefore it is necessary for electron beam absorbed dose measurements to regulate, in order to improve the level of e-beam applications. Currently known electron beam absorbed dose measurement methods calorimetry, chemical and ionization chamber method, in which calorimetry is a direct measure of ionizing radiation is granted only way according to the material energy. Topic selection calorimeter as electron beam absorbed dose measurements of subjects, while chemical dosimeters are compared with the calorimeter. Which selected the graphite calorimeter calorimeter and a polystyrene calorimeter, chemical dosimeter using potassium dichromate (silver) chemical dosimeters and selected program EGSnrc Monte Carlo simulation is used. Subjects using Monte Carlo simulation program EGSnrc electron beam energy of 9.53MeV irradiation conditions, the water, graphite and polystyrene depth dose distribution. Simulation shows four different energy electron beam in the maximum range of polystyrene and extrapolating the measured maximum range for comparison. According to the simulation of the percentage depth dose distribution (PDD), and polystyrene gives graphite absorbed dose absorbed dose into the water absorbed dose conversion factor. With Frike dosimeter calibration in 60Co radiation field cerium sulfate - cerous dosimeters and potassium dichromate (Silver) dosimeters, after potassium dichromate (silver) dosimeters in 9.53MeV energy electron beam simultaneously under conditions cerium sulfate and after irradiation, respectively - and graphite cerium dosimeter compare calorimeter. Graphite calorimeter calorimeter and polystyrene measured under conditions of dynamic irradiation doses, it is converted to water, and then compare the absorbed dose. Simulation and experimental results showed that: the electron beam simulation of the actual range of polystyrene and polystyrene wedge actual measurements extrapolated range difference is less than 1.5%; potassium dichromate (Silver) dosimeter radiation chemistry yield of the γ-rays and electron beam radiation field difference of less than 1.85%; dynamic irradiation in graphite calorimeter calorimeter and polystyrene measured by the difference of the electron beam dose is less than 1.1%.

Related Dissertations

  1. Aerial Target Anti-interference Recognition and Tracking System,TN215
  2. Research on Real Options Models and Applications in China,F832.5
  3. Monte Carlo simulation cC 4 F 8 and CHF 3 mixed gas discharge characteristics,TM213
  4. Light in the steady - state transmission model the layered tablet biological organization,R318.51
  5. Numerical Study of Stochastic Supersensitiviy of Generalized Burgers Equation,O241
  6. Rock tunnel construction risk assessment methods applied research,U455.1
  7. Reliability Analysis and Fatigue Analysis for CNG Storage Gas Pressure Vessel Using Finite Element Method,TH49
  8. Study on Optical Properties of the Dynamic Human Skin,R751
  9. The Risk and Pricing Research of Mortage-Backed Securitization,F293.3;F224
  10. The Application Study of VaR in the Risk Measurement of Domestic Commercial Banks,F832.3
  11. Research on Quality Test and Regulation of Structured Financial Products,F224
  12. The Approximate Nonstationary Probability Densities for Responses of Nonlinear Stochastic Systems Subject to Gaussian White Noise Excitations,O422.8
  13. The Research of Credit Risk Management Base on Add-on Calculation,F831.5
  14. Pricing Switch-Option-Embedded Notes in a LIBOR Market Model,F224
  15. Nonparametric Two Factor Term Structure Model and Pricing of Interest Rate Derivative,F832.1
  16. Non-invasive blood glucose measurement NIR,R319
  17. Study on Combining Forecast Method for Personal Credit Scoring Based on Optimized Indexes,F832.4
  18. PIN energy X -ray tube measurement study,TL814.1
  19. Feasibility Study of Neighbourhood Centre Project in Tianjin Airport Logistics Processing Area,F552;F252
  20. Amino phosphonate derivatives with calf thymus DNA by the research,R96

CLC: > Industrial Technology > Nuclear technology > Particle detection,radiation detection and nuclear instrumentation > Radiation detection technology and instrumentation > Radiation dosimeter
© 2012 www.DissertationTopic.Net  Mobile