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Two‐dimensional dose distribution of 1 2 5 I seeds
Author(s) -
Ling C. Clifton,
Schell Michael C.,
Yorke Ellen D.,
Palos Bernice B.,
Kubiatowicz David O.
Publication year - 1985
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595689
Subject(s) - dosimetry , dosimeter , physics , attenuation , thermoluminescence , distribution (mathematics) , cobalt 60 , nuclear medicine , radiation , atomic physics , computational physics , optics , nuclear physics , mathematics , irradiation , medicine , mathematical analysis
Two‐dimensional dose distribution has been measured for the new (model 6711) 1 2 5 I seeds used in interstitial implants. Two independent methods, using a silicon diode or thermoluminescent dosimeters, yielded identical results. At any given distance r from the seed center, the dose varies with θ, the angle relative to the seed's axis. Similarly, the r dependence of the dose distribution is different at various θ values. These observations can be qualitatively understood in terms of several factors, namely, source encapsulation, geometrical relationship, and attenuation and scatter. Empirical expressions which approximate the measured results have been developed to facilitate clinical dose distribution calculations.