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A minimum total amount of aluminum filtration (inherent plus added) of 2.5 mm is required in equipment operated
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Above 70 kVp
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Major effects of irradiation of macromolecules include
1.
point lesions.
2.
cross-linking.
3.
main-chain scission.
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1, 2, and 3
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Point Lesions
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A point lesion is a disturbance of a single chemical bond, which can result in malfunction within the affected cell.
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Cross linking
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A point lesion is a disturbance of a single chemical bond, which can result in malfunction within the affected cell. Following irradiation, a small extension-type molecule can develop, extending from the main chain. This molecule can attach to a neighboring molecule or to another portion of the same molecule; this is referred to as cross-linking.
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Main-chain scission
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Main-chain scission is breakage of the molecule's principal connection, so that the molecule is broken into smaller molecules. Each of these radiation effects on macromolecules is repairable. (Bushong, p 505)
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