X-ray Math 6 - Grid Conversion

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VIDEO INFO! How do we calculate the exposure time given mAs and mA? #xray #xraytech
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I have a problem question. Original tech. factor: 90kVp, 80mAs, 8:1 grid

Non-grid mAs

the answer on the answer sheet is 23mAs

If I apply what you have just said then the answer should be 20 and not 23. can you explain why is the answer is 23 and not 20?

ronaldcueto