Advisor(s) - Committee Chair
William Buckman, James Parks, George Moore
Department of Physics and Astronomy
Master of Science
Calcium carbonate with impurities of lead and manganese have produced measurable thermoluminescence (TL) when excited by ultraviolet (uv) radiation. In this investigation the lead impurities comprise the majority of trapping centers stimulated by uv irradiation. In addition, centers associated with the CO3groups have been found to be capable of absorbing uv and ultimately producing TL. The 2537 Å mercury line is primarily responsible for stimulating these centers, and the response was found to be linear to 0.6734 joules/cm2.
The thernoluminescence response was discovered to be dependent on the concentrations of lead and manganese. However, for a given concentration of manganese there exists a particular concentration of lead that will maximize TL.
The wavelength region 3100 Å to 3300 Å was found to be responsible for optically detrapping charges previously stimulated by 2537 Å irradiation.
The studies of linearity of response, dose rate dependence, fading, and wavelength response indicate that this phosphor may be employed as an ultraviolet TL dosimeter. This would permit the application over the range of uv wavelengths from 2300 Å to 2700 Å, and dose rate intensities from 75 uW/cm2 to 1600 uW/cm2.
Physical Sciences and Mathematics | Physics
Schrope, Dennis, "Ultraviolet Excitation Thermoluminescence of Lead-Manganese Calcium Carbonate" (1975). Masters Theses & Specialist Projects. Paper 2828.