In accordance with M.G.L. c. 111, § 5O, the Commissioner may summarily suspend a license or order immediate cessation of an activity, pending a hearing, whenever the Commissioner finds that public health, safety or the environment would be threatened by delay in issuance of an order. A mammography facility may not operate during the period of a suspension of its license or conduct a prohibited activity after notification of an order of immediate cessation of said activity.