Hong Kong Regulations

RADIATION (CONTROL OF IRRADIATING APPARATUS) REGULATIONS - REGULATION 17

Material protection in case of static irradiating apparatus

PART VI

MATERIAL PROTECTION AND SAFE PRACTICE

(1) No person shall cause or permit any irradiating apparatus to be used
continuously in any room unless the floors, ceilings, walls and observation
windows thereof are so constructed that nowhere outside the room does the
radiation dose rate exceed 3 micrograys per hour: (L.N. 410 of 1982; L.N. 225
of 1990; L.N. 154 of 1995) Provided that the provisions of this subregulation
shall not apply to any floor, ceiling, wall or observation window so sited
that the space immediately outside thereof is not capable of habitual
occupation by any human being.

(2) All protective material, other than sheet lead, shall be indelibly marked
in such a way as to show readily its equivalent thickness  of lead, and
protective materials which depend upon substances other than lead for their
protective properties shall in addition have marked thereon the constant
electrical potential used for the generation of X-rays under the conditions at
which the equivalence applies.

(3) All protective glass, including lead glass or lead barium glass, or
protective liquid observation windows, shall be clearly and indelibly marked
in such a way as to show readily its equivalent thickness  of lead.

(4) No person shall use any protective material, other than sheet lead, which
is not marked in accordance with the provisions of subregulation (2) or (3).
(L.N. 225 of 1990)

(5) Nothing in this regulation shall be construed to prevent the temporary
removal from the address stated in the licence relating thereto of any
portable or mobile irradiating apparatus incidental to its operation as such.

(6) Any person who contravenes any of the provisions of subregulation (1) or
(4) shall be guilty of an offence and be liable on conviction to a fine of
$15000. (L.N. 97 of 1970; L.N. 225 of 1990)