Neutrons for Diagnostic Imaging?

As I usually do, I checked out Science Daily yesterday and found an interesting article entitled New Way Of ‘Seeing’: A ‘Neutron Microscope’. Certainly, upon reading the title, it makes perfect sense that one can use any subatomic particle as an imaging medium so long as: 1. it interacts with the subject intended to be imaged, and 2. is capable of being detected (and focused) easily. (Actually, the two requirements are really just one, as one cannot detect a particle without interaction.) For example, neutrinos, which are almost-massless particles that are emitted from suns by the billions of billions, pass through our bodies every second, but rarely interact with our matter. As such, neutrinos will fail to serve as the probe in a diagnostic imaging device.

The most pervasive particle/wave used for imaging is the photon. Varied energy photons give information about matter with which they interact. For example, infrared photons equate to the vibrational energy levels between atoms in a molecule and microwaves correspond to the rotational degrees of freedom in a molecule. Another particle used to image is the electron (as in a SEM).

The article discusses some of the details about the device and what it was tested on (a rat). The press release, however, fails to mention the effects of neutrons on living tissue. Neutrons do interact most heavily with hydrogen (of which our bodies have a lot), but does this interaction involve radioactive decay? I would imagine not simply because such activity would require high energy neutrons impacting a nucleus: the neutron source in this microscope probably emits low-energy neutrons just strong enough to pass through dense tissues like bone. Of course, this is just a supposition, so anyone with more knowledge in the area of particle physics better speak up.