This report of the National Council on Radiation Protection and
Measurements (NCRP) , successor to the National Committee on Radiation
Protection and hleasurements, is concerned with the spccification
of sealed sources of nuclides which emit gamma rays-sources
useful in brachytherapy. The report resulted from the Council's belief
that a single well-defined method for specifying the radionuclide in an
encapsulated source would be advantageous for both the users and the
suppliers of such sources....
Science of brachytherapy is currently increasing in the field of cancer therapy. By
virtue of the development of computer assisted technologies, we can reap the benefits
of accurate radiotherapies more than ever, which enabled precise irradiation to a
target safely avoiding unnecessary involvement of the surrounding normal tissue.
Unlike teleradiotherapy provided by X-ray linear accelerator, brachytherapy utilizes
radiation source placing inside or close to the target.
Brachytherapy is the direct implantation of radioactive sources into the prostate. It is based on the principle that the deposition of radiation energy in tissues decreases as a function of the square of the distance from the source (Chap. 81). The goal is to deliver intensive irradiation to the prostate, minimizing the exposure of the surrounding tissues. The current standard technique achieves a more homogeneous dose distribution by placing seeds according to a customized template based on CT and ultrasonographic assessment of the tumor and computer-optimized dosimetry.