Article Dans Une Revue Physics in Medicine and Biology Année : 2017

Real-time detection of fast and thermal neutrons in radiotherapy with CMOS sensors

Résumé

The peripheral dose distribution is a growing concern for the improvement of new external radiation modalities. Secondary particles, especially photo-neutrons produced by the accelerator, irradiate the patient more than tens of centimeters away from the tumor volume. However the out-of-field dose is still not estimated accurately by the treatment planning softwares. This study demonstrates the possibility of using a specially designed CMOS sensor for fast and thermal neutron monitoring in radiotherapy. The 14 microns-thick sensitive layer and the integrated electronic chain of the CMOS are particularly suitable for real-time measurements in γ/n mixed fields. An experimental field size dependency of the fast neutron production rate, supported by Monte Carlo simulations and CR-39 data, has been observed. This dependency points out the potential benefits of a real-time monitoring of fast and thermal neutron during beam intensity modulated radiation therapies.

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Dates et versions

hal-02108116 , version 1 (24-04-2019)

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Nicolas Arbor, Stephane Higueret, Halima Elazhar, Rodolphe Combe, Philippe Meyer, et al.. Real-time detection of fast and thermal neutrons in radiotherapy with CMOS sensors. Physics in Medicine and Biology, 2017, 62 (5), pp.1920. ⟨10.1088/1361-6560/aa5bc9⟩. ⟨hal-02108116⟩
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