Thermoluminescent studies on a LiF (TLD-100) crystal , 1974

Item — Call Number: MU Thesis Law

Identifier: b2088647

Staff Only

Scope and Contents

From the Collection:

The collection consists of theses written by students enrolled in the Monmouth College graduate Physics program. The holdings are bound print documents that were submitted in partial fulfillment of requirements for the Master of Science degree.

Dates

Creation: 1974

Creator

Law, Jonathan N. (Jonathan Norman) (Author, Person)
Smith, Robert O. (Robert Owens) (Thesis advisor, Person)

Conditions Governing Access

The collection is open for research use. Access is by appointment only.

Access to the collection is confined to the Monmouth University Library and is subject to patron policies approved by the Monmouth University Library.

Collection holdings may not be borrowed through interlibrary loan.

Research appointments are scheduled by the Monmouth University Library Archives Collections Manager (723-923-4526). A minimum of three days advance notice is required to arrange a research appointment for access to the collection.

Patrons must complete a Researcher Registration Form and provide appropriate identification to gain access to the collection holdings. Copies of these documents will be kept on file at the Monmouth University Library.

Extent

1 Items (print book) : 66 pages ; 8.5 x 11.0 inches (28 cm).

Language of Materials

English

Additional Description

Abstract

The polarization properties of the light emitted by the thermoluminescent phosphor TLD-100 (Harshaw Chemical Co.), in crystalline form, is investigated for three different thermal and radiation histories (virgin, sensitized, and desensitized). The results of the investigation show no significant evidence of any type of polarization phenomena present for any of the conditions observed. This fact suggests that the luminescent centers responsible for the TL photons are probably anisotropic elementary radiators situated randomly in the crystal lattice.

Further data analysis showed spectral characteristics indicating slightly longer wavelengths for lower temperature peaks, which is consistent with those findings of other observers, and peak height ratios which varied as a function of radiation and thermal history.

The noted spectral shift is qualitatively explained through considering those recombination centers closer to the conduction band as having the highest probabiliity of being associated with a recombination event. The qualitative explanation for the peak height ratio behavior as a function of radiation and thermal history involves higher trappping probabilities for those trapping sites which are closer to the conduction band, competing deep traps and selective radiation damage to those trapping sites which are unfilled. An experiment is suggested with looks at peak height ratios as a function of dose delivered to the crystal. This experiment will confirm or refute the explanation presented for the peak height ratios and is currently being formulated.