For the love of all heck.
What, exactly, do
neutrons have to do with cold fusion? I detect neutrons all the time; they're an ubiquitous component of natural background radiation. Most of the time I wish I could get rid of them.
And I don't
think there's a cold-fusion device following me around the lab.
And---CR-39 is the worst possible detector for a neutron experiment. It's an
integrator. When you etch CR-39 you see all of the radiation that's ever hit it, between the day it was manufactured and the day you etched it. It doesn't tell you when the hits occurred. It doesn't particularly tell you what the hits were. It's useful for one and only one thing:
a) detecting
large neutron/proton/etc. fluxes (i.e., large enough to overwhelm the inevitable background), when
b) there's a gamma-ray background so large that other detectors (borated scintillator, etc.) are saturated.
That's why they get used at accelerators, in ICF experiments, etc. It's the wrong thing to use for a low-background experiment of any sort. It's
doubly the wrong thing to use for a
pulsed low background experiment. For a low-background, pulsed neutron experiment, you want a blob of boron-loaded plastic scintillator and a photomultiplier tube.