In M1 Districts, unsealed radioactive materials shall not be manufactured, utilized, or stored (unless such materials are stored in a fireproof container at or below ground level) in excess of one million times the quantities set forth in Column 1 of the table in Section 38-2 of the Industrial Code Rule No. 38, relating to Radiation Protection adopted by the Board of Standards and Appeals of the New York State Department of Labor on October 10, 1955, effective December 15, 1955.

In M2 Districts, such materials shall not be manufactured, utilized, or stored (unless such materials are stored in a fireproof container at or below ground level) in excess of 10 million times the quantities set forth in Column 1 of the table cited in this Section. In M3 Districts no limits as to such permitted quantities shall apply.