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Uv Laser Excitation for Ultra-Sensitive Photoluminescent Dosimetry

Conference:

Abstract

The factor which has limited the sensitivity of photoluminescent dosimetry has been the ''pre-dose'' background which is stimulated during readout by the usual continuous ultra-violet (UV) exposure. The signal-to-noise ratio has only been partially optimized by the selective choice of filters and optical geometry. A microdosimetric system has been conceived and investigated which is potentially capable of sensing extremely low radiation doses (of the order of microrads). This system depends on the little-known fact that the decay time for the visible luminescence, which is a measure of the absorbed dose, is at least ten times longer than the decay of the indistinguishable visible fluorescence (to UV) which is an inherent characteristic of unexposed silver phosphate glasses. The system consists of UV, 3500A, laser beam, with a Pockels cell so that it has complete cut-off in intensity in the order of nanoseconds, and gating circuitry to open the visible light-sensing photomultiplier at a sufficient time delay to prevent it from sensing the ultra-violet or the pre-dose fluorescence which decays within the order of 100 nanoseconds. In this way the signal-to-noise ratio can be vastly improved upon that obtainable by optical means. With this system the authors were easily able to measure  More>>
Authors:
Kastner, J.; Eggenberger, D.; Longnecker, A.; [1]  King, D.; Schutt, D. [2] 
  1. Argonne National Laboratory, Argonne, IL (United States)
  2. Radiation Laboratory, University of Notre Dame, South Bend, IN (United States)
Publication Date:
Mar 15, 1967
Product Type:
Conference
Report Number:
IAEA-SM-78/33
Resource Relation:
Conference: Symposium on Solid State and Chemical Radiation Dosimetry in Medicine and Biology, Vienna (Austria), 3-7 Oct 1966; Other Information: 3 refs., 3 figs.; Related Information: In: Solid State and Chemical Radiation Dosimetry in Medicine and Biology. Proceedings of a Symposium| 488 p.
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 61 RADIATION PROTECTION AND DOSIMETRY; BEAMS; COBALT 60; EXCITATION; FILTERS; FLUORESCENCE; GLASS; IN VIVO; LASERS; MICRODOSIMETRY; PHOTOLUMINESCENCE; RADIATION DOSES; READOUT SYSTEMS; SENSITIVITY; SIGNAL-TO-NOISE RATIO; SILVER PHOSPHATES; SPATIAL RESOLUTION
OSTI ID:
22109617
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M1592067262
Submitting Site:
INIS
Size:
page(s) 115-119
Announcement Date:
Jul 04, 2013

Conference:

Citation Formats

Kastner, J., Eggenberger, D., Longnecker, A., King, D., and Schutt, D. Uv Laser Excitation for Ultra-Sensitive Photoluminescent Dosimetry. IAEA: N. p., 1967. Web.
Kastner, J., Eggenberger, D., Longnecker, A., King, D., & Schutt, D. Uv Laser Excitation for Ultra-Sensitive Photoluminescent Dosimetry. IAEA.
Kastner, J., Eggenberger, D., Longnecker, A., King, D., and Schutt, D. 1967. "Uv Laser Excitation for Ultra-Sensitive Photoluminescent Dosimetry." IAEA.
@misc{etde_22109617,
title = {Uv Laser Excitation for Ultra-Sensitive Photoluminescent Dosimetry}
author = {Kastner, J., Eggenberger, D., Longnecker, A., King, D., and Schutt, D.}
abstractNote = {The factor which has limited the sensitivity of photoluminescent dosimetry has been the ''pre-dose'' background which is stimulated during readout by the usual continuous ultra-violet (UV) exposure. The signal-to-noise ratio has only been partially optimized by the selective choice of filters and optical geometry. A microdosimetric system has been conceived and investigated which is potentially capable of sensing extremely low radiation doses (of the order of microrads). This system depends on the little-known fact that the decay time for the visible luminescence, which is a measure of the absorbed dose, is at least ten times longer than the decay of the indistinguishable visible fluorescence (to UV) which is an inherent characteristic of unexposed silver phosphate glasses. The system consists of UV, 3500A, laser beam, with a Pockels cell so that it has complete cut-off in intensity in the order of nanoseconds, and gating circuitry to open the visible light-sensing photomultiplier at a sufficient time delay to prevent it from sensing the ultra-violet or the pre-dose fluorescence which decays within the order of 100 nanoseconds. In this way the signal-to-noise ratio can be vastly improved upon that obtainable by optical means. With this system the authors were easily able to measure quantitatively one milliroentgen of cobalt-60 exposure. They are of the opinion that further improvement in this system should enable them to do track visualization and/or in vivo biological microdosimetry with a spatial resolution of the order of ten microns. (author)}
place = {IAEA}
year = {1967}
month = {Mar}
}