So if you're reactor is on the scale of meters the neutron length scales, it looks like a thermal neutron, is in the order of a tenth of a meter.

For example, domestic consumption could be cut by the large-scale employment of smart meters in houses and flats.

At its finest scale, we should be able to probe down the "Planck length" which measures 10-35 meters. But the GEO600 experiment detected noise at scales of less than 10-15 meters.