· 2019
Radiation Detection and Measurement
- 670citations
- 2019year
Short summary
This chapter introduces dose measurement theory and practical dosimeters for radiotherapy, highlighting calorimetry as a method to quantify absorbed energy by measuring precise temperature changes.
AI-generated from the title and abstract; the full text is not read.
Key points
- Calorimetry measures absorbed dose by detecting minute temperature changes proportional to absorbed energy.
- Ionisation chambers for megavoltage photons are calibrated directly in absorbed dose.
- Practical dosimeters for radiotherapy must meet specific operational requirements.
- Detector sensitivity can vary with accumulated radiation dose.
AI-generated from the title and abstract; the full text is not read.
Abstract
This chapter provides an introduction to the theory of dose measurement and presents an overview of the design and operation of practical dosimeters encountered in the modern radiotherapy department. Calorimetry is one method of measuring absorbed dose whereby the precise quantification of minute temperature changes in irradiated samples are used to produce direct evidence of the energy absorbed during the process, because the heat energy absorbed by a sample is proportional to the absorbed dose. Ionisation chambers for megavoltage photons are calibrated directly in absorbed dose and not air kerma via the National Physical Laboratory absorbed dose standard and the Institute of Physical Sciences in Medicine Code of Practice. To be useful in a radiotherapy department a detector must satisfy certain basic requirements. The detector may be calibrated at body temperature using a phantom at a raised temperature. The sensitivity varies with accumulated radiation dose.
The authors' abstract, as published at the source., 2019 · DOI ↗
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Field: Radiation
RadiationPhysics and Astronomy