Wednesday, May 14, 2008

Radiophotoluminescence 5/14/08

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February 1969, 16:2 > Silver-activated Lithium Borate...
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Silver-activated Lithium Borate Glasses As Radiophotoluminescence Dosimeters with Low Energy Dependence.
Papers

Health Physics. 16(2):125-133, February 1969.
Becker, K.; Cheka, J. S.
Abstract:
A radiophotoluminescent silver-activated glass based on the (Li2O, B2O3) system instead of the usual metaphosphate matrix has been studied. By reduction of the amount of silver activator, glasses with an energy dependence comparable to LiF (sensitivity variation within +/-10 to 30% between 10 keV and several MeV) have been prepared. Their weathering resistance has been unproved by additions of BeO. Maximum radiophotoluminescence (RPL) is developed by a heat treatment. More unusual dosimetric properties of such glasses are good stability even at high temperatures (up to 300-350[degrees]C), and a remarkable difference between the RPL and the absorption spectra obtained by the thermal neutron and gamma radiation. Also, the neutron induced RPL centers are less stable than the gamma radiation induced ones. RPL and absorption spectra as well as some other properties of these glasses have been studied in comparison with a conventional metaphosphate glass.

(C)1969Health Physics Society




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Begin forwarded message:
From: Florence T. Cua
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Subject: Fwd: Title: Radiophotoluminescent Dosimetry J, in www.freewebs.com/ftcuatableofelements/

http://www.health-physics.com/pt/re/healthphys/abstract.00004032-197506000-00017.htm;jsessionid=LvtCLDtGgxFDtNJtZCypbhyvKW68Q2xyJsNCH7QNbppLTr1CJ807!-341159882!181195629!8091!-1

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June 1975, 28:6 > Intercomparison Between Photographic,...
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Intercomparison Between Photographic, Thermoluminescent and Radiophotoluminescent Dosimeters.
Papers

Health Physics. 28(6):793-799, June 1975.
Deus, Sudernaique F.; Watanabe, Shigueo
Abstract:
A comparison has been made between the responses of three different dosimetric systems, namely, photographic, thermoluminescent (TL) and radiophotoluminescent (RPL) dosimetry. The comparison was divided into two parts. The first one was carried out with known radiation conditions (exposure, normal incidence, energy) in a controlled environment (~27[degrees]C temperature, ~70% r.h.). Under these conditions, the response as a function of exposure and energy, the relation of the linearity to the energy, the lowest detectable exposure, and the reproducibility were studied. Response as a function of the exposure at 37 keVeff and at 1 MeV was found to be linear in the region of interest to routine personnel dosimetry for all dosimeters except the films. Although the film response is not linear with exposure, the ratio between the response at 37 keVeff and at 1 MeV does not depend on the exposure, and this allows the determination of a simple correction factor for the radiation energy. Such energy corrections are usually necessary, since all the dosimeters, except the LiF TL dosimeters are strongly energy dependent. In the second part, the relative response of the dosimeters was measured under the uncontrolled condition in personnel dosimetry. Because the CaSO4: Dy is the most sensitive dosimeter, comparisons were made using this dosimeter as the standard, in which case it was found that 20 out of 29 TLD-100 dosimeters gave the same reading within 30%, 13 out of 29 RPL dosimeters agreed within 30%, and only 3 out of 29 films fell within 30%.

(C)1975Health Physics Society




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From: "Florence T. Cua"
Date: May 8, 2008 8:06:50 AM EDT
To: ccbernido@pnri.dost.gov.ph, tvleonin@pnri.dost.gov.ph, ebaldu@yahoo.com
Cc: Leah Tolosa , j gan
Subject: Title: Radiophotoluminescent Dosimetry J, in www.freewebs.com/ftcuatableofelements/

http://rpd.oxfordjournals.org/cgi/content/abstract/nci663v1

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What's this?
© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

SSD 2004 Special Issue Articles

NEW Al2O3:C,Mg CRYSTALS FOR RADIOPHOTOLUMINESCENT DOSIMETRY AND OPTICAL IMAGING

Mark S. Akselrod 1 * and Anna E. Akselrod 1
1 Landauer, Stillwater Crystal Growth Division, 723 1/2 Eastgate Road Stillwater OK, 74074, USA



* To whom correspondence should be addressed.
Mark S. Akselrod, E-mail: makselrod@landauerinc.com





Abstract


Optical and dosimetric properties of a new radiophotoluminescent material based on aluminum oxide doped with carbon and magnesium (Al2O3:C,Mg) and having aggregate oxygen vacancy defects are presented. The Al2O3:C,Mg crystals are characterized by several new optical absorption and emission bands. It is suggested that the main optical properties of this material are due to the formation of aggregate defects composed of two oxygen vacancies and two Mg-impurity atoms. Radiation-induced optical absorption bands are centered at 335 and 620 nm and produce fluorescent emission at 750 nm with a 75 ± 5 ns lifetime. The dose measurements are performed by illumination of the Al2O3:C,Mg crystal with 335 nm or 650 nm light and by measuring the intensity of the 750 nm fluorescence. The detector material is insensitive to room light before and after the irradiation and the traps are stable up to 600°C. A dose measurement range between 5 mGy and 200 Gy, suitable for therapeutic radiology applications, was demonstrated. The short luminescent lifetime and nondestructive readout is favorable for imaging applications.






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