Hong Kong Regulations

RADIATION (CONTROL OF IRRADIATING APPARATUS) REGULATIONS - REGULATION 2

Interpretation

(Past version on 30/06/1997).

In these regulations, unless the context otherwise requires-

"approved laboratory" (認可檢驗所) means a laboratory approved by the
Board for the purposes of regulation 16;

"dental irradiating apparatus" (牙科輻照儀器) means a type of
irradiating apparatus specifically designed for the taking of radiographs of
the teeth or jaws; (L.N. 225 of 1990)

"dental practitioner" (牙醫) means a person for the time being registered or
deemed to be registered under the Dentists Registration Ordinance ( Cap  156);

"diagnostic irradiating apparatus" (診斷用輻照儀器) means an
irradiating apparatus designed for medical diagnosis; (L.N. 225 of 1990)

"dose" (劑量) is the quantity of absorbed energy from radiation;

"dose limit" (劑量限值) in relation to persons employed in radiation work
means a dose of radiation-

   (a)  in the case of the whole body, as a result of exposure of the whole or
        part of the body, of 20 millisieverts in any calendar year;

   (b)  without prejudice to paragraph (a), in the case of an individual organ
        or tissue (other than the lens of the eye) or any body extremity or
        area of skin averaged over any 1 square centimetre, of 500
        millisieverts in any calendar year;

   (c)  in the case of the lens of the eye, of 150 millisieverts in any
        calendar year;

   (d)  in the case of the abdomen of a woman with reproductive capacity, of 5
        millisieverts in any consecutive 3 months interval; and

   (e)  in the case of a pregnant woman, of 1 millisievert to the fetus during
        the pregnancy of the woman; (L.N. 225 of 1990; L.N. 154 of 1995)

"dosemeter" (劑量計) means an instrument for measuring exposure to
radiation;

"dose rate" (劑量率) is the dose per unit of time, usually expressed as
grays per minute and symbolized Gy/min. or as sieverts per minute and
symbolized Sv/min.;

"employ" and "employment" (僱用、受僱) include reference to any kind of
work carried out in furtherance of apprenticeship or any agreement for
training;

"equivalent thickness of lead" (鉛的等厚) means such thickness of lead as
is equally opaque to a specific quality of radiation;

"filter" (射線過濾器) means any substance interposed in a beam of
radiation for the purpose of changing its quality or intensity, or both; and

"filtration" has a meaning corresponding therewith;

"Gray" (戈瑞) means a unit of absorbed dose of energy from radiation which
is equivalent to 1 joule per kilogram of material irradiated; (L.N. 410 of
1982)

"half-value layer" (半值層) means the thickness of material which reduces
to half the exposure rate of a particular beam of radiation;

"intensity" (強度) means the quantity of radiation passing through a unit
area perpendicular to the direction of the beam of radiation per unit of time;

"ionometric method" (離子濃度測量法) means a method of measurement
based on the ionization produced by the radiation which is being measured;

"licence" (牌照) means a licence issued under section 9 of the Ordinance;

"licensee" (持牌人) , in relation to any irradiating apparatus, means a
person holding a licence for the time being in force issued under the
Ordinance with respect to that apparatus;

"panel" (醫務小組) means such committee as the Board may from time to time
appoint under section 5 of the Ordinance for the purpose of advising the Board
upon matters affecting or concerning the state of health of persons employed
or to be employed on, or engaged in, radiation work;

"personnel radiation monitoring device" (工作人員輻射監測器具) means
a device designed to be worn or carried by an individual for the purpose of
measuring exposure to radiation and includes a photographic film suitable for
that purposes, placed in an appropriate film holder; (L.N. 229 of 1985)

"photograph" (照片) means a photograph of approximate size neither greater
than 50 x 70 mm nor smaller than 40 x 50 mm; (L.N. 225 of 1990)

"proximity" (接近) , in relation to any irradiating apparatus, means a
position in which a person may be liable to receive a dose of radiation
exceeding 6 millisieverts to any part of the body if such position were
retained by him for one calendar year; (L.N. 154 of 1995)

"quality" (質量) , in relation to radiation, means the property of the
radiation which determines the manner in which it affects and is itself
altered by the matter it traverses, expressed quantitatively in terms of
equivalent constant potential or half-value layer;

"radiation" (輻射) and "rays" (射線) mean ionizing radiation;

"radiation hazard" (輻射危害) means the danger to health arising from
exposure to ionizing radiation whether such danger is due to radiation arising
from sources outside the human body or to radiation from radioactive
substances within the body;

"radiation work" (輻射性工作) means work by any person which involves
proximity to any irradiating apparatus in operation;

"sealed source" (密封源) means a radioactive substance which is permanently
enclosed in a container in such a manner that it or any part of it cannot be
separated from the container unless the container is damaged, but also in such
a manner as to permit of the emission of radiation;

"sievert" (希沃特) means that quantity of radiation which when absorbed by
man produces an effect biologically equivalent to the absorption by man of one
gray of X-rays with average specific ionization of 100 ion pairs per
micrometre of water, in terms of its air equivalent, in the same region; (L.N.
410 of 1982)

"therapeutic irradiating apparatus" (治療用輻照儀器) means an
irradiating apparatus designed for medical therapy; (L.N. 225 of 1990)

"useful beam" (有用束流) means, in the case of X-rays, that part of the
radiation from an X-ray tube that passes through the aperture, cone or other
device for collimating the X-ray beam, and, in other cases, any radiations
from a sealed source that can be employed for the purposes for which the
sealed source is used;

"X-ray machine" (X射線機) means any machine that can be used for the
production of X-rays. (L.N. 410 of 1982; L.N. 225 of 1990; 32 of 2000 s. 48)

"approved laboratory" (認可檢驗所)

"dental practitioner" (牙科輻照儀器)

"dental irradiating apparatus" (牙醫)

"diagnostic irradiating apparatus" (診斷用輻照儀器)

"dose" (劑量)

"dose limit" (劑量限值)

"dosemeter" (劑量計)

"dose rate" (劑量率)

"employ" and "employment" (僱用、受僱)

"equivalent thickness of lead" (鉛的等厚)

"filter" (射線過濾器)

"Gray" (戈瑞)

"half-value layer" (半值層)

"intensity" (強度)

"ionometric method" (離子濃度測量法)

"licence" (牌照)

"licensee" (持牌人)

"panel" (醫務小組)

"personnel radiation monitoring device" (工作人員輻射監測器具)

"photograph" (照片)

"proximity" (接近)

"quality" (質量)

"radiation" (輻射) and "rays" (射線)

"radiation hazard" (輻射危害)

"radiation work" (輻射性工作)

"sealed source" (密封源)

"sievert" (希沃特)

"therapeutic irradiating apparatus" (治療用輻照儀器)

"useful beam" (有用束流)

"X-ray machine" (X射線機)