The scaling method applied to beta particle line sources with a finite diameter
1Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands. schaart@iri.tudelft.nl
Abstract:
The well-known scaling method for planar and punctiform beta particle sources is extended to the case of a cylindrical source with a length larger than the beta particle range times two and with an infinitesimal or finite diameter. The equation for a spherical source with a finite diameter is also given. As a means of illustration, previously measured and simulated radial depth-dose distributions of a 40-mm-long prototype 188W/188Re intravascular beta source in polymethylmethacrylate are scaled to H2O and compared with simulations in the latter medium. The results suggest that the scaling method is accurate to within about 3%, provided that the finite diameter of the source is taken into account.
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