Section 5P. It shall be unlawful for any person to use, manufacture, produce, transfer, receive, acquire, own, or possess any source of radiation unless licensed, registered or exempted from licensing or registration requirements by the department pursuant to section five N. Any person who violates said section five N or five O, or any rule, regulation, license, registration or order adopted or issued under said section five N or five O shall be fined not less than one hundred nor more than two thousand dollars, or be imprisoned for a period of not more than two years, or both. Any person who continues to violate the provisions of this section after due notice by the department shall be fined not less than one thousand nor more than twenty thousand dollars or be imprisoned for a period of not more than twenty years, or both. After due notice has been issued by the department, each day of such violation shall constitute a separate offense.