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free-air ionization chamber |
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free-air ionization chamber [¦frē ¦er ‚i·ə·nə′zā·shən ‚chām·bər] (nucleonics) An ionization chamber in which the ionizing radiation is limited by a diaphragm, so that ionization is detected in a region of accurately known volume, away from the electrodes and other internal parts of the equipment. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| More recently, NIST added a new cylindrical free-air ionization chamber of an Attix design [5] to provide air-kerma standardization for mammography x-ray beams from both Mo and Rh anodes operated in the 23 kVp to 40 kVp range [6]. For a free-air ionization chamber standard with measuring volume V, the air-kerma rate is determined by the relation The instrument most nearly suitable for exposure measurements of radiation from iodine-125 is the Ritz [2] free-air ionization chamber ( |
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