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Additional resources for Dosimetry of X-Ray and Gamma-Ray Beams for Radiation Therapy in the Energy Range 10 keV to 50 MeV

Example text

Weather stations usually state the atmospheric pressure corrected to sea level, which may be considerably Merent h m the station pressure. Upon request, weather stations usually will give the station pressure; occasionally, however, the person responding will not know the difference between the two pressures. 6 Electrical Leakage, Spurious Ionization During the exposure of an ionization chamber, electrical leakage acrow insulators cannot be didhg&hed from ionization in the chamber. Since excessive electrical leakage may commence at unexpected times, chambers and measuring systems shall be tested for leakage prior to use.

With normalization at the calibration depth, the measured absorbed dose at various depths should agree with that used clinically (usually published) within 2 percent. If this agreement cannot be obtained, the manufacturer sircrU be consulted. 2. The HVL method is not recommended in this energy range because large changes in x-ray energy are required for small changes of HVL, and a HVL may be associated with more than one photon energy. For example, 2-MeV and 7-MeV monoenergetic photons have the same HVL in lead.

Another experimental method, discussed in Figure 10 and its caption, utilizes the charge colleded at two collecting potentials to fix the value of lumped parameters so that an ion collection efficiency may be calculated from theory. Differenof the order of 1percent in the ion collection efficiency derived from calculation and h m the two experimental methods for typical pulsed x-ray beams mav occur. A correction factor for ion recombination is the -reciprocal oi the ion collection efficiency. For exposure rates of 40 / 5.

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