Typo on line 447: "(ICRP, 20014a)" should be "(ICRP, 2014a)"
Definition of NORM, lines 1519-1523, gives no indication that materials which enhance exposure by simply being moved or opened would be NORM (granite given in another commenter's example). Some would note the change as being the difference between NORM and TENORM. Having NORM defined as only artificially enhanced concentrations, that would mean no NORM is truly occuring in nature.