By C.A.F. Joslin, E. Hall, A. Flynn
This authoritative new reference offers a complete overview of present perform in afterloading brachytherapy. It covers the clinical rules of brachytherapy and its purposes in scientific perform. the 1st sections of the publication disguise Physics and Radiobiology, whereas the 3rd part is dedicated to the medical software of the strategy on the subject of particular tumor websites. every one bankruptcy is authored by way of stated specialists in those fields. The layout and provision of a brachytherapy provider, caliber insurance and price implications also are mentioned.
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Source trains with multiple sources are more difficult to measure with high precision. The manufacturer is better placed to obtain information about the strength of individual sources prior to fabrication of the source trains. The user can check the relative distribution of activity by film dosimetry, thermoluminescent dosimetry (TLD), and by judicious use of a re-entrant chamber, but overall it is better to obtain as much information as possible about the strength of individual sources prior to loading of the source trains.
4 summarizes both sets of measurements. For relatively large distances, and in the typical hospital laboratory, room scatter may introduce errors that are not negligible. As an extended time period will be required to collect sufficient charge for acceptable precision, it is important that leakage for the electrometer system is measured and, if necessary, an appropriate correction made. Iridium-192 has a very complex emission spectrum which includes approximately 24 lines occurring in the energy range 9-885 keV.
When necessary, data from the certificate of calibration should be re-calculated using the same units and conversion factors as those employed in the definitive calibration. Any difference between the corrected data and the definitive calibration must be reconciled. Using the clinical data calculated from these measurements, the response of a suitable dosimeter must be calculated for a different treatment time from that used in the calibration. In the case of equipment into which a value of source strength can be programmed, it is recommended that the calculated treatment time should be based on the displayed source strength.