About 2 hours after infusion of a Fluorine-18 based tracer. We are down to about 4.30kcps now after about 6 hours.
The positron-electron annihilation peak is clearly visible. The radiacode 103 is incredibly sensitive. Being anywhere in the house immediately raises the count, so it can pick up the radiation from over 15 metres and through walls quite easily.
An HP70. It did not come cheap, but they are probably the rarest model HP ever made. They had a very short life before the HP22 made them obsolete and did not sell particularly well. This one is in full working order.
Mid terrace house loft conversion done maybe 30 years ago. No evidence of any issues but obviously something that would make a building inspector blanch these days I guess. Assume each bracket is supporting around 100kg as a rough guess, standard tiled roof, property has been completely reroofed, no corrosion issues or anything. Assume you could take up some more steel, cut and splice and cut into party wall and put in padstones, but, well. It's been there for at least 30 years. Thoughts? Surveyor didn't freak out when house was purchased 22 odd years ago.