Role of Silicon Activator in Exoelectron Emission from BeO

Gammage, R.B.; Crase, K.W.; Becker, Klaus

doi:10.1097/00004032-197201000-00010

Cited by 15 publications

(4 citation statements)

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“…Silicon with a concentration of 2000 ppm is also present in commercial ceramic BeO. Etch experiments indicated that the high TSEE efficiency of ceramic Be0 is strongly related to this impurity [6]. At temperatures between 1300 and 1560 "C a mixture of Be0 and SiO, is composed of Be0 and Be, SiO, [7].…”

Section: Methodsmentioning

confidence: 99%

Effects of high temperature oxidation on the TSEE of BeO thin films

Lemmer

Kriegseis

Scharmann

1994

Phys. Stat. Sol. (a)

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Section: Methodsmentioning

confidence: 99%

Effects of high temperature oxidation on the TSEE of BeO thin films

Lemmer

Kriegseis

Scharmann

1994

Phys. Stat. Sol. (a)

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“…Recently, a new OSL dosimetry system was developed in Germany based on Thermolox™ 995 BeO material previously investigated as TL and TSEE detector [47][48][49][50]. Commercial grade ceramic chips were used as an OSL phosphor emitting UV luminescence under blue light stimulation [14,[51][52][53][54].…”

Section: Brief History Of Oslmentioning

confidence: 99%

“…Recent publications resulted from collaboration between Helmholtz-Zentrum (former GSF) in Munich and the Technical University of Dresden in Germany described the ongoing development of a personal dosimetry system based on BeO industrial ceramic detectors and a modular OSL reader system. The detector material -Thermalox 995™ (Brush Ceramic Products, Brush Wellman, Inc), that was used in this OSL system is a well known industrial ceramic previously investigated in 60s and 70s as a potential TL/TSEE detector [48][49][50]. BeO has been considered as an alternative dosimeter material which may compete with the LiF (TLD100) due to its near tissue-equivalence (Z eff =7.14 vs Zeff ~ 7.6 for tissue) and high sensitivity, comparable to that of LiF.…”

Section: Beryllium Oxide Osl Dosimetric Materials and Systemsmentioning

confidence: 99%

Fundamentals of Materials, Techniques, and Instrumentation for OSL and FNTD Dosimetry

Akselrod

Rosenfeld²,

Kron³

et al. 2011

AIP Conference Proceedings

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The optically stimulated luminescence (OSL) technique has already become a successful commercial tool in personal radiation dosimetry, medical dosimetry, diagnostic imaging, geological and archeological dating. This review briefly describes the history and fundamental principles of OSL materials, methods and instrumentation. The advantages of OSL technology and instrumentation in comparison with thermoluminescent technique are analyzed. Progress in material and detector engineering has allowed new and promising developments regarding OSL applications in the medical field. Special attention is dedicated to Al 2 O 3 :C as a material of choice for many dosimetric applications. Different aspects of OSL theory, materials optical and dosimetric properties, instrumentation, and data processing algorithms are described. The next technological breakthrough was done with Fluorescent Nuclear Track Detectors (FNTD) that have some important advantages in measuring fast neutron and high energy heavy charge particles that have become the latest tool in radiation therapy. New Mg-doped aluminum oxide crystals and novel type of imaging instrumentation for FNTD technology are discussed with regard to application in mixed neutron-gamma fields, medical dosimetry and radiobiological research.

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“…A problem which had to be solved before any practical application could be considered was the relatively poor stability and reproducibility of early TSEE systems. A new counter has been developed at ORNL for ceramic BeO detectors which not only simplifies the readout of large numbers of detectors with a special loading procedure, but also helps to avoid many of the earlier problems by the application of a "pushing" electrical potential which injects the low-energy exoelectrons into the counting volume during readout [14]. It was thus possible to evaluate such detectors not only with a high sensitivity of more than 10 3 counts for one mrad per cm 2 of emitting surface area, but -more importantly -to reduce the standard deviation of multiple readings to 2-3 %.…”

Section: Exoelectron Dosimetrymentioning

confidence: 99%

Progress in Solid-State Fast Neutron Personnel Dosimetry.

Becker¹

1972

Self Cite

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The poor stability of latent recoil proton tracks in photographic emulsions has frequently been underestimated due to unrealistic testing conditions. Thin polycarbonate foils to be evaluated by automatic spark-counting exhibit no fading for at least three months at 32°C and 95 % humidity. As one of several alternatives to the NTA film, optimized combinations containing 237 Np or' 232 Th and 10ym polycarbonate foils are described ( 237 Np covers a wide dose range of % 10" 3 to £ 10 rad, and neutron energies £ 0.6 MeV). The directional response is given for different neutron energies and detector-phantom distances. Another approach consists of the amplification of recoil nuclei etch pits to facilitate automatic counting. The inherently low fast neutron response of most solid-state detectors can be increased by intimate contact with a hydrogenous material. TSEE detectors based on BeO, for example, which are covered with a hydrogenous radiator, have been used successfully in recent tests of criticality monitoring systems at ORNL. The thin sensitive layer of exoelectron detectors makes this approach especially attractive for intermediate neutron energies.

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Role of Silicon Activator in Exoelectron Emission from BeO

Cited by 15 publications

References 0 publications

Effects of high temperature oxidation on the TSEE of BeO thin films

Effects of high temperature oxidation on the TSEE of BeO thin films

Fundamentals of Materials, Techniques, and Instrumentation for OSL and FNTD Dosimetry

Progress in Solid-State Fast Neutron Personnel Dosimetry.

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