Investigation of a thermoluminescent dosimeter mixture between LiF:Mg,Ti and Li2B4O7 in a solid form
Date
1996
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Texas A&M University
Abstract
Thermoluminescent dosimetry is one of the most popular methods in use today for the monitoring of personnel exposures to radiation. This research investigates a different type of dosimeter, a 3:1 mixture of lithium fluoride (TLD-I 00) and lithium borate (TLD800) pressed into tablet form. This mixture was previously combined within PTFE tubing which limited the capabilities of the dosimeter. These limitations led to this investigation. Several methods of making the dosimeters were studied, including sintering and the addition of a binder. The dosimeter chips were exposed to both beta and gamma radiation with a slightly higher response in the beta measurements, about 19% higher. The response for the beta and gamma exposures were 6.012 ︢ 2.032 and 5.246 ︢1.648 RC for a dose of' I Gy, respectively. The main set of chips also were exposed to several dose levels to check for linearity. The best fit line for this data had a slope of 7.147 for thermoluminescent output versus dose. Based on this data the minimal detectable dose was calculated to be 0.58 mGy, or three times the standard deviation of the background. A fading study revealed a percent loss of 65.6% in 7 days for one set of dosimeters, and 18.4% in 26 days in another. The dosimeters were then checked for light sensitivity, but there was none observed.
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Includes bibliographical references.
Issued also on microfiche from Lange Micrographics.
Includes bibliographical references.
Issued also on microfiche from Lange Micrographics.
Keywords
nuclear engineering., Major nuclear engineering.