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@CuriousOne Yes, the point you made about the decay product not having to peeks is correct, I'm taking what an outside observer will calculate. But for Gravity, the box I'm assuming is a hypothetical that only exist in the quantum realm that shields everything, that includes possibly the graviton. But no one is certain about it's existence, and if it do you can not shield from it as the gravitational field is just described by GR. As for quantum gravity, it depends on the amount of gravity there actually is, should there be less than h, ...