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  • Title: Real-time detection of fast and thermal neutrons in radiotherapy with CMOS sensors.
    Author: Arbor N, Higueret S, Elazhar H, Combe R, Meyer P, Dehaynin N, Taupin F, Husson D.
    Journal: Phys Med Biol; 2017 Mar 07; 62(5):1920-1934. PubMed ID: 28192285.
    Abstract:
    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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