Corrected entry: M equips JB with a watch-mounted geiger counter to detect radioactivity. Then he hands him a radioactive homing device that he keeps on his person. Surely the homer would trigger the counter, but when he uses it the first time, the counter doesn't register.
papajim
9th Nov 2008
Correction: In the world of James Bond, M seems to be rather intelligent. It stands to reason that the homing device emitted a specific type of radiation and the Geiger counter was set to ignore that specific radiation.
papajim