Regulation 4

for radioactive substance of solid material, the activity concentration of a given radionuclide of artificial origin does not exceed the level prescribed in Part 2 of the First Schedule;

the activity concentration of any radionuclide in the uranium decay chain or the thorium decay chain does not exceed 1 Bq/g or the activity concentration of potassium‑40 does not exceed 10 Bq/g;

the radioactive substance when released is not reasonably expected to result in any individual incurring an effective dose of the order of 10 μSv or more in a year, or in the case of low probability scenarios, an effective dose of not more than 1 mSv in a year; and

for radionuclides of natural origin in residues that might be recycled into construction materials, or the disposal of which is liable to cause the contamination of drinking water supplies, the activity concentration in the residues does not exceed specific values derived so as to meet a dose criterion of the order of 1 mSv in a year.

the clearance of radioactive waste complies with paragraph (1);

a formal mechanism is in place to demonstrate compliance with the regulatory requirements in respect of clearance;

deliberate dilution of material, other than the dilution that takes place in normal operations, must not be carried out without the written approval of the Director‑General; and

any radiation markings will be removed from any material of which the requirements of these Regulations no longer apply.