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    $\begingroup$ Near duplicate: physics.stackexchange.com/questions/11506/… $\endgroup$
    – dmckee --- ex-moderator kitten
    Commented Feb 23, 2016 at 21:28
  • $\begingroup$ @dmckee thanks for quoting it as a near duplicate. The mentioning over there of concrete indicates the question is more likely to ask for protection against atomic explosions, as concrete with its water contents is a good shielding against neutrons but not against gamma- or X-rays. $\endgroup$
    – Gyro Gearloose
    Commented Feb 23, 2016 at 21:35
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    $\begingroup$ That question asks explicitly about gammas. He might or might not have known what he wanted, but that's what he asked for. $\endgroup$
    – dmckee --- ex-moderator kitten
    Commented Feb 23, 2016 at 21:37
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    $\begingroup$ Why don't we use [...] depleted uranium? What makes you think "we" don't? I have done work related to medical linear accelerators (used in radiation oncology) that employed uranium shielding. $\endgroup$
    – Solomon Slow
    Commented Feb 26, 2016 at 20:35

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