1. Work with ionising radiation shall not be required to be notified in accordance with regulation 6 when the only such work being carried out is in one or more of the following categories—
(a)where the concentration of activity per unit mass of a radioactive substance does not exceed the concentration specified in column 2 of Part I of Schedule 8;
(b)where the quantity of radioactive substance involved does not exceed the quantity specified in column 3 of Part I of Schedule 8;
(c)where apparatus contains radioactive substances in a quantity exceeding the values specified in sub-paragraphs (a) and (b) provided that—
(i)the apparatus is of a type approved—
(aa)by the Executive; or
(bb)by the Great Britain Executive in accordance with paragraph 1(c) of Schedule 1 to the Great Britain Regulations;
(ii)the apparatus is constructed in the form of a sealed source;
(iii)the apparatus does not under normal operating conditions cause a dose rate of more than 1???mSvh−1 at a distance of 0.1m from any accessible surface; and
(iv)conditions for the disposal of the apparatus have been specified by the chief inspector;
(d)the operation of any electrical apparatus to which these Regulations apply other than apparatus referred to in sub-paragraph (e) provided that—
(i)the apparatus is of a type approved—
(aa)by the Executive; or
(bb)by the Great Britain Executive in accordance with paragraph 1(d) of Schedule 1 to the Great Britain Regulations; and
(ii)the apparatus does not under normal operating conditions cause a dose rate of more than 1mSvh−1 at a distance of 0.1m from any accessible surface;
(e)the operation of—
(i)any cathode ray tube intended for the display of visual images; or
(ii)any other electrical apparatus operating at a potential difference not exceeding 30kV,
provided that the operation of the tube or apparatus does not under normal operating conditions cause a dose rate of more than 1mSvh–1 at a distance of 0.1m from any accessible surface;
(f)where the work involves material contaminated with radioactive substances resulting from authorised releases which the chief inspector has declared not to be subject to further control.