| effectiveness | 1. A measure of the accuracy or success of a diagnostic or therapeutic technique when carried out in an average clinical environment.; Cf. See: efficacy. 2. The extent to which a treatment achieves its intended purpose. (05 Mar 2000) |
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| relative biological effectiveness | The ratio of radiation dosages required to produce identical change based on a formula comparing other types of radiation with that of gamma or roentgen rays. (12 Dec 1998) |
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