Section 144-220-D-G-1602 - Control of access to very high radiation areasA. In addition to the requirements in D.1601, the licensee or registrant shall institute measures to ensure that an individual is not able to gain unauthorized or inadvertent access to areas in which radiation levels could be encountered at 5 Gy (500 rad) or more in one hour at 1 meter from a source of radiation or any surface through which the radiation penetrates. This requirement does not apply to rooms or areas in which diagnostic x-ray systems are the only source of radiation, or to non-self-shielded irradiators.B. The registrant is not required to control entrance or access to rooms or other areas containing sources of radiation capable of producing a very high radiation area as described in D.1602.A if the registrant has met all the specific requirements for access and control specified in other applicable Parts of this rule, such as, Part E for industrial radiography, Part F for x-rays in the healing arts, and Part I for particle accelerators.10-144 C.M.R. ch. 220, § D-G-1602