Performance of a low gain avalanche detector in a medical linac and characterisation of the beam profile

Abstract

Low gain avalanche detectors can measure charged particle fluences with high speed and spatial precision, and are a promising technology for radiation monitoring and dosimetry. A detector has been tested in a medical linac where single particles were observed with a time resolution of 50\,ps. The integrated response is similar to a standard ionising chamber but with a spatial precision twenty times finer, and a temporal precision over 100 million times better, with the capability to measure the charge deposited by a single linac pulse. The unprecedented resolving power allows the structure of the $\sim 3\mu$s linac pulses to be viewed and the 350\,ps sub-pulses in the train to be observed.

12 pages, 9 figures. Version as published in Phys. Med. Biol. with a more extensive introduction and extra references

References in corpus (2)

• Dosimetry for FLASH Radiotherapy: A Review of Tools and the Role of Radioluminescence and Cherenkov Emission
• Silicon Sensors for Future Particle Trackers