What type of chamber is utilized for dosimetry of accelerator produced photon and electron beams?

The Farmer type chamber is specifically designed for dosimetry of high-energy radiation such as photon and electron beams produced by accelerators. It has a well-defined geometry, which allows for accurate measurements of the radiation dose delivered in clinical settings. The chamber's construction typically includes a cylindrical shape with a central electrode, making it adept at measuring ionization in a given volume of air or tissue equivalent material, translating to a reliable reading of absorbed dose.

Furthermore, Farmer chambers are equipped to handle the unique characteristics of radiation produced by medical linear accelerators, showing good energy dependence and stability over time. Their design facilitates accurate calibration against known standards, which is crucial for ensuring patient safety and treatment efficacy. In clinical practice, their accuracy in dose measurement allows for monitoring treatment delivery, verifying that the intended dose is administered to the patient.

In contrast, other types of chambers, such as thimble chambers and Geiger-Muller counters, are suited for different applications. Thimble chambers, while also used in some clinical dosimetry, may lack the robustness and reliability of Farmer chambers for higher-energy beams. Geiger-Muller counters primarily detect radiation rather than measure absorbed dose, making them less applicable for precision dosimetry in radiation therapy.