Dissertation > Excellent graduate degree dissertation topics show

Research on Continuous Plutonium Aerosol Monitor in High Radon Environment and Equipment Development

Author: LiHuiBin
Tutor: LiJunLi
School: Tsinghua University
Course: Nuclear Science and Technology
Keywords: radioactive aerosol radon progeny continuous aerosol monitor decision limit HS-CAM
CLC: TL81
Type: PhD thesis
Year: 2013
Downloads: 16
Quote: 0
Read: Download Dissertation

Abstract


Radioactive aerosols can cause internal exposure to human by inhalation, acommonly used monitoring technology is in-situ monitored by continuous radioactiveaerosol monitor(CAM). At present, there are many commercial CAMs can be used, butthose equipment can only be used in normal radon environment. in high radonenvironment, interference due to radon progeny is serious, decision limit of plutoniumaerosols(LCfor short) is too high, and exceeds the concentration limit. This articlesystemically analyze the factors influence LCfor CAM. Based on the analysis, designscheme of high sensitive CAM was made, key technologies were solved, finally,HS-CAM was developed, and plutonium aerosol concentration in a cave was monitoredby the the equipment.(1) Factors influence LC, and degrees of the influence were analyzed. There arefive factors: spectrum tailing of radon progeny, separation of radon progeny, runningmode, monitoring time set, spectrum analysis technology.(2) Three key technologies were solved by theoretical analysis and experiments,including: filter testing and selection, vacuum chamber design and testing, sizediscrimination sampler for radon progeny development.(3) Based on the key technologies that have been solved, four parts of work weredone, including: overall design, mechanical design and machining, electric circuit andcontrol software development. Finally, practical CAM was manufactured.(4) Background spectra of the HS-CAM were tested in different radonconcentration environments and in different running modes. Based on the acquiredspectra, methods used to deduct interference of radon progeny were established, it is thecombination of variable tailing parameters method and spectra fitting method, andcomplete program was written(5) The background spectra were processed by the spectra analysis program, andtheir accuracy was tested by the statistical results. LClevels in different radonconcentrations and running modes were acquired. Finally, the HS-CAM was used tomonitor plutonium aerosol in a cave, and achieve the anticipated results.HS-CAM absorbed research results that have been applied to commercial CAMs,and developed several new technologies, LCof the equipment is the best all over the world. In normal radon environment level, and the monitoring cycle is one hour, LCisabout0.003Bq/m3, about1/30~1/150of the LCof commercial CAMs. If radonconcentration is10000~20000Bq/m3, LCcan also reach0.03Bq/m3in the samemonitoring cycle.At present, technologies in the equipment have mature, it can be used in high radonenvironment to monitor artificial α aerosols. Such as underground storage, mountaincave, and so on.

Related Dissertations

  1. Delayed coincidence method to distinguish radon isotopes Simulation,O562.6
  2. αSpectroscopy Standard Measurement Method on Reference Levels of Radon Progeny Value,TL817.2
  3. Effect of Calmodulin Expression on Mantle and Pearl Sac Tissues for Two Types of Implantation in Hyriopsis Schlegelii,S966.232
  4. Activity radioactive radon progeny aerosol size distribution monitoring system hardware circuit design,X84
  5. Research on the Performance of Filters for α-Radioactive Aerosol Sampling,TL752
  6. Study on Synthesis and Purification of TlBr Materials Used for Nuclear Radiation Detectors,TL81
  7. In Different Pressure an Experimental Study on Migration of Radon,TL81
  8. Radiation Field Data Acquisition and Wireless Transmission Processing,TL81
  9. CdTe nuclear radiation detector output signal noise processing method,TL81
  10. The Study of Sample Self-absorption Correction in Gamma-spectrum Analysis,TL81
  11. Research on Hand-held Rid’s Acqusition System Design,TL81
  12. DSP-based nuclear energy spectrum measurement system design,TL81
  13. X-ray air kerma reference radiation field of study,TL81
  14. Research on the On-site Monitoring Technique for Carborne Radioactive Waste Container,TL81
  15. Design of Multi-probe Radiation Survey Meter Based on MSP430,TL81
  16. Detection of Electromagnetic Radiation Based on Virtual Instrument Technology,TL81
  17. Identification of γ Spectrum Fingerprints of Nuclear Materials Based on Neural Network,TL81
  18. γ-ray Detection Instrument for Environment Monitoring,TL81
  19. Research of Portable Gamma-ray Spetrometre’s Data Acquisition System Based on ARM,TL81
  20. Research on Environmental Parameters Monitoring and Technology of Sampling Flux Controlling in Airborne Radioactive Measurement,TL81
  21. Nucleation density , level , measuring the thickness of integrated design principles and experimental study,TL81

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