Skip to main content
7 events
when toggle format what by license comment
Feb 7, 2023 at 21:10 comment added Karl Simpler: Hollow rod filled with plutonium, pushes against a lever and spring that holds a locking bolt. As it cools down with decay of the Pu, at some point the bolt is released, and starts some mechanism leading to discovery. The change in lenght with time can be accurately predicted, you just need to make the bolt delicate enough so mechanical tolerances are neglectable.
Nov 27, 2015 at 16:29 comment added Dallaylaen @SJuan76 RITEG has shown to be capable of lasting tens of years, so it's obviously a very reliable technology. However, I'm still not sure how it works on Foundation-style timescale. My proposed technology, if it works at all, should last for tens of thousands of years (we find stone tools that old, and can determine their age by 14C decay).
Nov 27, 2015 at 16:05 history edited Dallaylaen CC BY-SA 3.0
added 696 characters in body
Nov 26, 2015 at 1:02 comment added SJuan76 If you want a radiactive timer, use a en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator to operate a machine that keeps the object hidden. You will have to trust that the machine lasts in operating condition for that long, though...
Nov 26, 2015 at 1:00 comment added SJuan76 Radioactive materials do not decay into "nothingness". The number of baryons (protons + neutrons) remains stable. The radiactive decay leads to a small loss of mass (emitted as energy) but definitely at the end of each radiactive decay chain you find atoms from stable isotops.
Nov 25, 2015 at 19:18 comment added Sobrique Hmm, radioactive decay. I like that one.
Nov 25, 2015 at 19:15 history answered Dallaylaen CC BY-SA 3.0