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Retrospective Cohort Study and Prospective Cohort Study

X- Rays. Controls. Can travel a few metres in air, present an external radiation hazard for an individual in the same room or space.. Monitored by use of personal devices such as film badges or thermoluminescent dosimeters (tld's). These should then be processed by an approved dosimetry service and

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Retrospective Cohort Study and Prospective Cohort Study

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