[ RadSafe ] Thumb rules, continuing

[Doug Huffman]

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With some simple dimensions we might also be able to apply Point, Line
and Area Source thumb rules.  IIRC, R^-2; R^-1 (R<L/2), R^-2 (R>L/2) and
unfortunately I don't remember the area rules except maybe it's a point
source R>10L
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