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:
“At a time when pimpery, lick-spittlery, and picking the public’s pocket are the order of the day—indeed, officially proclaimed as virtue—the poet must play the madcap to keep his balance. And ours.”
—Studs Terkel (b. 1912)
“My weary limbs are scarcely stretched for repose, before red dawn peeps into my chamber window, and the birds in the whispering leaves over the roof, apprise me by their sweetest notes that another day of toil awaits me. I arise, the harness is hastily adjusted and once more I step upon the tread-mill.”
—“E. B.,” U.S. farmer. As quoted in Feminine Ingenuity, by Anne L. MacDonald (1992)