Why doesnt it beep when I go through?

Question

I have an AICD (internal defibrillator) in my chest, which is made of some kind of metal. When I go through a metal detector, it doesnt beep. Why? Is it only certain kinds of metal or something?

Answer 1

It's probably because your heart is hidden beneath layers of body fat, muscle, skin, bone and other stuff, so it would take a lot of getting through, with clothes as well.

Also, the sensitivity and detectiveness of the detector and perhaps the type of metal it is made from may affect it.

Answer 2

There are several factors: the type of metal, the sensitivity of the machine (hand-set), the humidity, and what is covering the metal. Sometimes I have to remove my watch; sometimes I can just cover it with my hand to get thru. Funny thing -- my machete always seems to set off the detector.

Answer 3

Differences on sensitivity of the detectors, like others said. But also the size of the metal, the type of metal.

The detector is a large coil, or pair of coils, connected to capacitors to form a resonant circuit. The frequency is high (RF). A metal large enough will change the resonant frequency, and trigger the alarm.

Answer 4

yep and i think it depends on the metal detector, the one at carowins mage my belly ring go off and ive never had it go off anywhere else, i suppose it depends