It shall be unlawful for any person to transport or store in transit the following radioactive materials in any county in New Jersey which has an average population density exceeding 1,000 persons per square mile as measured in the most recent decennial census:
Any quantity of radioactive material specified as "Low Specific Activity" by the Nuclear Regulatory Commission in 10 CFR Part 71, entitled "Packaging of Radioactive Material for Transport" shall be exempt from the provisions of this act.
N.J.S. § 26:2D-23.1