photographic film
YES
iodine
Diode detector
chelsea say head
FM detector And Evelope detector
Xrays can be used for diagnosing lots of problems. They are a standard in most hospitals. Radiation is not good no matter what, but the benefits outweigh the risks and the amount of radiation is so small that you get more radiation walking in the sun in summer.
Coins are found by the detector sending a pulse which picks up metal signals. Now there are two types a low frequency and a pulse indicator, the low frequency is used to pick up deeper objects
it is a detector that does not change the conditions in which it is being used
Americium is not used in X-ray instruments.
XRAYS
A lie detector cannot be used in court. On rare occasions it can be used as an investigation tool. Check with an attorney.
A magnet