(a) The Commissioner of Energy and Environmental Protection shall adopt regulations, in accordance with the provisions of chapter 54, for the general or specific licensing of sources of ionizing radiation. The commissioner may issue, deny, renew, modify, suspend or revoke such licenses and may include such terms and conditions in such licenses that the commissioner deems necessary. Nothing in this section shall be construed to confer authority to the commissioner to regulate materials or activities reserved to the Nuclear Regulatory Commission under 42 USC 2021(c) and 10 CFR 150.

(b) Said commissioner may exempt certain sources of ionizing radiation or kinds of uses or users from the licensing requirements set forth in this section when he makes a finding that the exemption of such sources of ionizing radiation or kinds of uses or users will not constitute a significant risk to the occupational and public health and safety.

(c) Until such time as regulations governing licensing are promulgated in pursuance of an agreement between the government of the United States and this state as authorized by § 22a-152, registration shall be deemed to satisfy any licensing requirements arising under sections 22a-151 to 22a-158, inclusive.

(d) Any person that has a license prior to the effective date of an agreement pursuant to § 22a-152 from the federal government or agreement state relating to by-product material, source material or special nuclear material and which license will be subject to the control of this state upon the effective date of such agreement, shall be considered to have a like license with this state until the expiration date specified in such license from the federal government or agreement state or until the end of the ninetieth day after such person receives notice from the Department of Energy and Environmental Protection that such license will be deemed expired.