Other CT examinations involve higher radiation doses ranging up to eight times the dose received from background radiation in ... dose is at the body surface where the beam enters the body. In a ...

The combination of aluminium, carbon and copper filters with the helium background atmosphere in ... From a knife-edge scan across the X-ray beam, we evaluated a beam-divergence angle of 0.2 ...

This is usually less than the estimated daily natural background dose received by the foetus ... adequate diagnostic quality (i.e. keeping the shielding outside of the X ray beam) and that it does not ...

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