A System for Measuring Radiation Induced Chemical Products in Atmospheric Gases Using Optical Detection Methods

<p>This research is a part of an effort to characterize the chemical products generated by radiation interacting with atmosphere. One method of detecting ionizing radiation is to monitor the radiation induced products in the atmosphere around the source. This project explored the potential for using Cavity Ringdown Spectroscopy to evaluate the presence of chemical products generated by the air-radiation interaction near an alpha radiation source. In particular, measurements of ozone concentration within a controlled atmosphere chamber as affected by radiation exposure were obtained.</p> <p>The first portion of this thesis provides brief reviews of ionizing radiation and ozone formation as well as an explanation of Cavity Enhanced Absorption Spectroscopy and Cavity Ringdown Spectroscopy. This is followed by a description of the optical and vacuum systems that were available and the modifications required to integrate the optical system into the vacuum chamber to achieve the ability to optically monitor the ozone levels in a controlled atmosphere. Both the ringdown data collection and the vacuum system control processes were automated using software developed throughout this project. A discussion of these programs is also included in this thesis. Finally, results are presented and discussed that verify the system is capable detecting a correlation between the presence of an absorbing species and exposure to ionizing radiation.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Masters Thesis

Discipline thesis:degree_discipline

Physics and Astronomy

Year dc:date.available

2010

Author dc:creator

• Reese, Tyler Webster

Contributors dc:contributor

• Chris Winstead
• Lawrence Mead
• Michael Vera

• radiation
• atmosphere
• ozone
• Cavity Ringdown Spectroscopy
• Physics

Repository record dc:identifier

https://aquila.usm.edu/masters_theses/908

OAI identifier oai:identifier

oai:aquila.usm.edu:masters_theses-1986