Published February 17, 1983 | Version v1
Miscellaneous Restricted

Effects of tissue inhomogeneities on the dose distribution of 60Co γ radiation

Creators

Description

Dose measurements were carried out in a cork-water phantom under simple physical and geometric conditions in order to determine the influence of tissue inhomogeneities on the dose distribution. The experimental data were compared with data obtained by different methods of calculation. A new method based on Burlin's effective attenuation method takes account of the dependence of the effective attenuation coefficient on the thickness of the inhomogeneity layer (for a layer thickness < 10 cm). The effective attenuation coefficients are derived from tabulated tissue-air ratios. The correction factors thus determined vary from the experimental correction factors by less than 3% (in 80% of all cases, by less than 2%). (orig./HP)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (German)

Unter einfachen physikalischen und geometrischen Bedingungen wurden in einem Kork-Wasser-Phantom Dosismessungen durchgefuehrt und der Einfluss von Gewebeinhomogenitaeten auf die Dosisverteilung untersucht. Die experimentell ermittelten Werte und die nach verschiedenen Rechenmethoden bestimmten Werte wurden untereinander verglichen und diskutiert. Eine neu entwickelte Methode, die sich an die effektive Schwaechungsmethode von Burlin anlehnt, beruecksichtigt zusaetzlich die Abhaengigkeit des effektiven Schwaechungskoeffizienten von der Inhomogenitaetsschichtdicke bei Schichtdicken unter 10 cm. Die effektiven Schwaechungskoeffizienten werden dabei ohne grossen Aufwand aus tabellierten Gewebe-Luftverhaeltnissen bestimmt. Die Methode liefert Korrekturfaktoren, die um weniger als 3% und fuer 80% der Werte um weniger als 2% von den experimentell bestimmten Korrekturfaktoren abweichen. (orig./HP)

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Additional details

Additional titles

Original title (German)
Einfluss von Gewebeinhomogenitaeten auf die Dosisverteilung von

Publishing Information

Imprint Pagination
87 p.
Report number
INIS-mf--9105

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
15056421
Subject category
S07: ISOTOPES AND RADIATION SOURCES; S62: RADIOLOGY AND NUCLEAR MEDICINE; S63: RADIATION, THERMAL, AND OTHER ENVIRONMENTAL POLLUTANT EFFECTS ON LIVING ORGANISMS AND BIOLOGICAL MATERIALS;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
COBALT 60; COMPARATIVE EVALUATIONS; COMPUTER CALCULATIONS; COMPUTER CODES; CORRECTIONS; DEPTH DOSE DISTRIBUTIONS; ENERGY LOSSES; GAMMA RADIATION; IRRADIATION PROCEDURES; PHANTOMS; PHOTON BEAMS; RADIOTHERAPY; TISSUES
Descriptors DEC
BEAMS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BODY; COBALT ISOTOPES; DISTRIBUTION; ELECTROMAGNETIC RADIATION; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTO; IONIZING RADIATIONS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MEDICINE; MINUTES LIVING RADIOISOTOPES; MOCKUP; NUCLEI; ODD-ODD NUCLEI; RADIATION DOSE DISTRIBUTIONS; RADIATIONS; RADIOISOTOPES; SPATIAL DISTRIBUTION; SPATIAL DOSE DISTRIBUTIONS; STRUCTURAL MODELS; THERAPY; YEARS LIVING RADIOISOTOPES