A version of the above dosimeter without the self-reading capabilities, called a pocket ionization chamber or just pocket chamber, was widely used in World War II and postwar government and military projects, particularly the Manhattan project. This consisted of a simple ionization chamber with an electrode running down the center, but no electroscope for reading. Instead the exposure was read by plugging the device into a separate precision electrometer/charger, which measured the decline in charge on the electrode and displayed it on a meter, before recharging the electrode. These had the advantage that they were simpler, more rugged, and cheaper than the electrometer type, but the disadvantage (considered desirable in some military applications) that the exposure couldn't be read by the wearer without the electrometer/charger. They are no longer used.
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Famous quotes containing the words pocket and/or chamber:
“The legitimate powers of government extend to such acts only as are injurious to others. But it does me no injury for my neighbour to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg.”
—Thomas Jefferson (1743–1826)
“Another day. Deliberations are recessed
In an iron-blue chamber of that afternoon
On which we wore things and looked well at
A slab of business rising behind the stars.”
—John Ashbery (b. 1927)