Using two radii to divide a circle according to the golden ratio yields sectors of approximately 137° (the golden angle) and 222°.137 is a strictly non-palindromic number and a primeval number.
Radioactive isotopes are effective tracers because their radioactivity is easy to detect.
A tracer is a substance that can be used to follow the pathway of that substance through some structure.
Scientists were also able to use radiocarbon dating to show that the age of a mummified body found in the ice of the Alps was 5,300 y. In 1989, several groups of scientists used carbon-14 dating to demonstrate that the age of the Shroud of Turin was only 600–700 y.
Many people still cling to a different notion, despite the scientific evidence.
For instance, leaks in underground water pipes can be discovered by running some tritium-containing water through the pipes and then using a Geiger counter to locate any radioactive tritium subsequently present in the ground around the pipes.