125Iodine is an example of an isotope which emits photons of energy less than 60keV. It should be noted that 3H cannot be detected with a standard lab survey meter and that only very large quantities ...

It used to be that every well-stocked doomsday bunker had a Geiger counter. These days, you don’t have to have a big tube-based meter. You can inexpensively get a compact digital instrument to ...