1. line 1132/33 - Sentence does not make sense.
2. line 1145/48 - Use of English is obscure
3. line 1284 - Use of English is obscure.
4. line 1379 - This number is usually written as 8 billion tons.
5. line 1519/23 - This definition does not consider the existence of NORM before any radionuclide concentrations are chnaged by soem process. For example - granite which is mined does not have its radionuclide activity changed by mining but is still a NORM material. The definition should focus more on the enhanced exposures by human involvement rather than a change in the activity concentration.