As UberGerbil said. Normalt prints rarely show any detail above 300 dpi, that means, to actually get that detail into a scan you need to use 600dpi in the scanner settings, else you will waste detail. That said, true digital prints on photopaper can contain up to 400dpi on paper. Scanning negs is a different story. Color film rarely has that much detail, slide film more, and some odd special black and whites can have incredible resolution, but people usually dont use technicalpan for normal photography.
What it comes down to is to always use double the dpi in the scanner setting against what you know/think the original contains and in some cases, what you need to output. This due to the fact how sampling work. But if i didnt know, i would err on the highside if it was important. And unless you have some special reason, do your processing, then save as something more efficiant than Tiff, even though you can use both zip or lzh compressed tif's. A lossy format still contains more than enough detail at high res and high quality settings as long as you doesnt have too much processing left to do.