条の二十七に定める実効線量限度及び等価線量限度を超えないようにしなければなら ない。 Article 30-18 (1) The manager of a hospital or clinic shall take any of the  measures set forth in items (i) through (iii) and the measures set forth in items  (iv) through (vi) and shall keep a dose at which a radiation care worker, etc.  (which means a person who is involved in handling or management of an X-ray  appliance, high-energy radiation generator for medical care, particle beam  irradiation appliance for medical care, irradiation appliance for medical care,  irradiation implement for medical care, medical appliance equipped with  radioisotopes, radioisotopes for medical care, or radioisotopes for positron  computerized tomography examination (hereinafter referred to as "X-ray  appliance, etc." in this paragraph) or in operations incidental thereto and  enters the controlled zone; the same applies hereinafter) not exceeding the  effective dose limit and the equivalent dose limit specified in Article 30-27:  一 しやへい壁その他のしやへい物を用いることにより放射線のしやへいを行うこと。 (i) shielding radiation by using shields, such as shielding walls;  二 遠隔操作装置又は鉗子を用いることその他の方法により、エックス線装置等と人 体との間に適当な距離を設けること。 (ii) keeping an adequate distance between an X-ray appliance, etc. and a  human body in such a way as using a remote controller or forceps;  三 人体が放射線に被ばくする時間を短くすること。 (iii) shortening time during which a human body is exposed to radiation;  四 診療用放射性同位元素使用室、陽電子断層撮影診療用放射性同位元素使用室、貯 蔵施設、廃棄施設又は放射線治療病室において放射線診療従事者等が呼吸する空気 に含まれる放射性同位元素の濃度が第三十条の二十六第二項に定める濃度限度を超 えないようにすること。 (iv) keeping the concentration of radioisotopes contained in air which a  radiation care worker, etc. breathes in a room for using radioisotopes for  medical care, room for using radioisotopes for positron computerized  tomography examination, storage facility, disposal facility, or radiation  therapy sickroom not exceeding the concentration limit specified in Article  30-26, paragraph (2);  五 診療用放射性同位元素使用室、陽電子断層撮影診療用放射性同位元素使用室、貯 蔵施設、廃棄施設又は放射線治療病室内の人が触れるものの放射性同位元素の表面 密度が第三十条の二十六第六項に定める表面密度限度を超えないようにすること。 (v) keeping the surface density of radioisotopes on a thing which a person  touches in a room for using radioisotopes for medical care, room for using  radioisotopes for positron computerized tomography examination, storage  facility, disposal facility, or radiation therapy sickroom not exceeding the  surface density limit specified in Article 30-26, paragraph (6); and  六 放射性同位元素を経口摂取するおそれのある場所での飲食又は喫煙を禁止するこ 186 