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Measurement of Radiation: Dosimetry Part Three

The Physics of Radiology. Measurement of Radiation: Dosimetry Part Three. BME College Sherman Sheen( 辛学刚 ). Determination of Absorbed Dose in a Phantom using an Exposure Calibrated Ion Chamber. Kerma in the cavity :. imagine a small mass, △m, of phantom material

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Measurement of Radiation: Dosimetry Part Three

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  1. The Physics of Radiology Measurement of Radiation: Dosimetry Part Three BME College Sherman Sheen(辛学刚)

  2. Determination of Absorbed Dose in a Phantom using an Exposure Calibrated Ion Chamber

  3. Kerma in the cavity : imagine a small mass, △m, of phantom material placed at point P”，at the center of the air cavity. The (collision) kerma to △m would be:

  4. fill in the cavity, of radius c, with phantom material. This would alter the kerma to the small mass, △m, by the attenuation factor, k(cmed), and the kerma to mass △m would now be: the absorbed dose at point P in the homogeneous phantom may be obtained from:

  5. to have a dosimeter calibrated in terms of absorbed dose instead of exposure

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