Small pieces of steel/iron have a rapid decay signal, and brass like ammo is not seen at all, certainly would take much larger mass than anyone could carry without be noticed as MOST obvious....
our test object was a 4" long piece of 1/2" diameter steel rod....
would take a large Tejas size belt buckle to set it off.....among common articles giving false alarms....
Anyone remember the name Sentrie??? by INTEX, Bethesda Md.???
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