Handheld inspection device and method of inspecting an infrastructure having a structure wall supported into material

A handheld inspection device for inspecting an infrastructure having a structure wall at least partially supported into material, the handheld inspection device comprising:

• a portable frame;
• one or more high energy photon source mounted to said portable frame and having a field of radiation diverging towards a target region of said infrastructure, said high energy photon source radiating a photon beam along said field of radiation and at least partially penetrating across said structure wall and through said supporting material behind said structure wall, said one or more high energy photon source each having a radioactivity level of 400 kBg or below;
• a scattered photon detector mounted to said portable frame and having a field of view diverging towards said target region of said infrastructure and encompassing at least a portion thereof, said scattered photon detector detecting scatter events incoming from said target region during a given period of time, and generating a signal indicative of scatter events detected during said period of time;
• and
• a controller communicatively coupled to said scattered photon detector, said controller having a processor and a non-transitory memory having stored thereon instructions that when executed by said processor perform the steps of:
• receiving said signal generated by said scattered photon detector;
• and
• generating an integrity indication associated to said target region of said infrastructure based on said received signal.