Neutron‐induced electronic failures around a high‐energy linear accelerator

Abstract

As illustrated by the CT-on-rails system in the current study, physicists should be aware that electronic systems may be highly sensitive to neutron radiation. Medical physicists should therefore monitor electronic systems that have not been evaluated for potential neutron sensitivity. This is particularly relevant as electronics are increasingly common in the therapy vault and newer electronic systems may exhibit increased sensitivity.

Performance characterization of a 3D liquid scintillation detector for discrete spot scanning proton beam systems

“…The effect of such radiations on the cameras can range from temporary loss of function to permanent damage. Shielding electronics with borated polyethylene has produced only limited benefits (Kry et al 2011). Although our unshielded cameras have been exposed to doses of more than 100 MU, we have yet to experience any loss of camera functionality.…”

Management of radiotherapy patients with implanted cardiac pacemakers and defibrillators: A Report of the AAPM TG‐203†

“…Instead, hydrogenous materials are required for attenuation . Since electronic devices can show substantial sensitivity to high‐LET radiation, any neutron contribution should be carefully considered.…”

Pitfalls of tungsten multileaf collimator in proton beam therapy

“…[61][62][63][64][65] The evidence of this is recently reported for novel electronics used for CT-scanner on rails. 66 The neutrons can cause high rate of SEU through microdose effect in the elements of integrated circuit (IC) due to ion's transport from neutron reactions in lower intermetal dielectric layers of the IC. 67 Typical position of electronic boards in an MLC designed for megavoltage therapy is laterally to the MLC block.…”