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007 cr bn|||||||||;

008 120124s2011 ncua ob 000 0 eng d;

035 a| (Sirsi) o773726809;

035 a| (OCoLC)773726809;

040 a| EREc| EREd| EREd| UtOrBLW;

049 a| EREE;

090 a| QD181.I7;

100 1 a| Benhabib, Sidi Mohammed.?| UNAUTHORIZED;

245 12 a| A proposed methodology to assess HDR ¹⁹²Ir radial dose with Fricke dosimetry /c| by Sidi Mohammed Benhabib.;

260 a| [Greenville, N.C.] :b| East Carolina University,c| 2011.;

300 a| 117 pages :b| illustrations (some color), digital, PDF file;

336 a| text2| rdacontent;

337 a| computer2| rdamedia;

338 a| online resource2| rdacarrier;

538 a| System requirements: Adobe Reader.;

538 a| Mode of access: World Wide Web.;

502 b| Ph.D.c| East Carolina Universityd| 2011.;

500 a| Presented to the faculty of the Department of Physics.;

500 a| Advisor: Austerlitz Campos.;

500 a| Title from PDF t.p. (viewed Feb. 2, 2012).;

520 3 a| The radial absorbed dose to water, D(r,theta), a quantity not yet directly measured with primary standards, was assessed with the Fricke solution which has been considered as an absolute aqueous solution to perform dosimetry. To determine D(r=2 cm,theta=90°), a hollow quasi-water Fricke ring device filled with Fricke solution was designed to measure the change in the optical density in the Fricke solution at 303 nm wavelength caused by the exposure from a HDR 192Ir radioactive source positioned in its center inside a 15~15~15 cm³ PMMA water phantom. A mini-irradiator was also designed and constructed to determine the product of the molar extinction coefficient and the chemical yield value of the Fricke solution at 303 nm against an A-12 ion chamber, in which its main dosimetric parameters to determine the absorbed dose to water were calculated using the PENELOPE Monte Carlo code. To enhance dosimetric accuracy, a large number of measurements were performed with both the quasi-water Fricke ring device and with the mini-irradiator calibration device. The radial absorbed dose to water at r = 2 cm and theta = 90° determined with the quasi-water Fricke ring device was compared against that determined with the HDR treatment planning system Ocentra. The results have shown that if the quantity D(r = 1 cm, theta = 90°) is replaced by D(r = 2 cm, theta= 90°), the methodology employed in this work may be used for clinical applications to determine the absolute radial absorbed dose to water with accuracy comparable to those assessed with Farmer and well-type ion chambers.;

504 a| Includes bibliographical references.;

650 0 a| Iridiumx| Isotopes.=| ^A1022553;

650 0 a| Fricke dosimeters.=| ^A1096817;

650 0 a| Ferrous sulfate.=| ^A756579;

650 0 a| Radiation.=| ^A11388;

653 a| Physics;

653 a| Biophysics;

653 a| Medicine;

700 1 a| Austerlitz Campos, Carlos.?| UNAUTHORIZED;

710 2 a| East Carolina University.b| Department of Physics.?| UNAUTHORIZED;

856 40 z| Access via ScholarShipu| http://hdl.handle.net/10342/3717;

949 o| jgml;

994 a| C0b| ERE;

596 a| 1 4;

998 a| 2677509;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 2677509-1001l| JNETm| JOYNERr| Ys| Yt| JNE3ETDu| 1/24/2012x| ETDz| JERESOURCE;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 2677509-2001l| HSLELECm| HSLr| Ys| Yt| HEETDu| 1/24/2012x| ETDz| HERESOURCE;

A proposed methodology to assess HDR ¹⁹²Ir radial dose with Fricke dosimetry / by Sidi Mohammed Benhabib.

Author/creator	Benhabib, Sidi Mohammed
Other author	Austerlitz Campos, Carlos.
Other author	East Carolina University. Department of Physics.
Format	Theses and dissertations
Publication Info	[Greenville, N.C.] : East Carolina University, 2011.
Description	117 pages : illustrations (some color), digital, PDF file
Supplemental Content	Access via ScholarShip
Subjects	Iridium--Isotopes. Fricke dosimeters. Ferrous sulfate. Radiation.

Summary	The radial absorbed dose to water, D(r,theta), a quantity not yet directly measured with primary standards, was assessed with the Fricke solution which has been considered as an absolute aqueous solution to perform dosimetry. To determine D(r=2 cm,theta=90°), a hollow quasi-water Fricke ring device filled with Fricke solution was designed to measure the change in the optical density in the Fricke solution at 303 nm wavelength caused by the exposure from a HDR 192Ir radioactive source positioned in its center inside a 15~15~15 cm³ PMMA water phantom. A mini-irradiator was also designed and constructed to determine the product of the molar extinction coefficient and the chemical yield value of the Fricke solution at 303 nm against an A-12 ion chamber, in which its main dosimetric parameters to determine the absorbed dose to water were calculated using the PENELOPE Monte Carlo code. To enhance dosimetric accuracy, a large number of measurements were performed with both the quasi-water Fricke ring device and with the mini-irradiator calibration device. The radial absorbed dose to water at r = 2 cm and theta = 90° determined with the quasi-water Fricke ring device was compared against that determined with the HDR treatment planning system Ocentra. The results have shown that if the quantity D(r = 1 cm, theta = 90°) is replaced by D(r = 2 cm, theta= 90°), the methodology employed in this work may be used for clinical applications to determine the absolute radial absorbed dose to water with accuracy comparable to those assessed with Farmer and well-type ion chambers.
General note	Presented to the faculty of the Department of Physics.
General note	Advisor: Austerlitz Campos.
General note	Title from PDF t.p. (viewed Feb. 2, 2012).
Dissertation note	Ph.D. East Carolina University 2011.
Bibliography note	Includes bibliographical references.
Technical details	System requirements: Adobe Reader.
Technical details	Mode of access: World Wide Web.

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A proposed methodology to assess HDR ¹⁹²Ir radial dose with Fricke dosimetry / by Sidi Mohammed Benhabib.

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