title: Radiation absorbed dose to bladder walls from positron emitters in the bladder content.
abstract: A method to calculate absorbed doses at depths in the walls of a static spherical bladder from a positron emitter in the bladder content has been developed. The beta ray dose component is calculated for a spherical model by employing the solutions to the integration of Loevinger and Bochkarev point source functions over line segments and a line segment source array technique. The gamma ray dose is determined using the specific gamma ray constant. As an example, absorbed radiation doses to the bladder walls from F-18 in the bladder content are presented for static spherical bladder models having radii of 2.0 and 3.5 cm, respectively. Experiments with ultra-thin thermoluminescent dosimeters (TLD's) were performed to verify the results of the calculations. Good agreement between TLD measurements and calculations was obtained.
mesh_terms: D001610:Beta Particles; D004583:Electrons; D005462:Fluorine Radioisotopes; D006801:Humans; D008163:Luminescent Measurements; D008953:Models, Anatomic; D014055:Tomography, Emission-Computed; D001743:Urinary Bladder / Q000000981:diagnostic imaging* / Q000528:radiation effects
chemical_list: D005462:Fluorine Radioisotopes