(28) Within the range of the Maximurn Permissiie Doses (see paragraph 57) specified . for occupational cxposure, when it is assumed that thece is no threshold ud that effects arc: linearly relatect to dose, it is justifiable to con- sider the average dose to the whole organ or tissue,elthough it is recognized that when more; Iii. is available, it will be _ information more rnean dosefor cells of any. (70) In the ease of nonciamagecaous disag runriate to use the done when the broaalready is as type, 2" given esttcle of the fase bauivel by daughter products irradiated is evucosa chial ‘lols. Sl. of radon and thoron. The use of the racan dose : % has practical advanteges in that the significant ; kines. determined anerciy by the en wee ce Berne Meet, ah ase meee Ut Ye itt LEER ‘ESOS ere ae : rename the this prinolism omit await fiihor oar at volume can be.ta%en - that Inoffact, Flew Tir the we en ee tissue under consideration. used already In: ciple has necessarily ‘been calculating maximunl permissible burdens oF : WEL radionnelictes In tissues. FTowever, wily Cxieers © exampic, wile Woinhemocencity of dose (for : aweh ane = ~ > — evidcace SeeETERS to show whether, with oo ches mn na = eteborg op eRe " * ~ . on : beeen orbs reantineee Dies Osteticnion oP thar * en.e in the decree. 7 anew! on irom thethe sacivi of Bradis iroim c lic resulis action ” “Ss ‘ leven eee : , a Thee . rs pariicuirts raha Ve . a rimeiewil OF ie socceic 7 > Pl UTM ee petivites suction meocediure giv ‘\ ASE Th. —_ ~ > i Lien ee 1 Crore a o Moron "phis is @ maticr upon which furiier work Is ' d cht c sud or redon sin, preducts, the relev aud cavchte addon . Also, for external exposure*, of the skin, i r products, the relevent needed t se. Fauivetea * «ane 1 selates we] Faquivaicat is that in the bronchial: 1S. . - - Dose . an achtelh fs 4 ered to be mucosa. which i the tusue consid * yey oe ; of the ted. Flere the waehat most heavily irradia inad le lune would b abstituie can madcaqua _ £ eho ae ge quate substitute Ce Us Sr that of the irradiated tissuc. . Vespeciany when thc distance to tue source very is very I exposed arcix Is 1 short or when the every: short peacee nio averag ta . be approp Hote ; riate not would i: tsmall, i it is . 7 : | bihe duse over the entire , it Tusicad skin. recommended that the dose be avcraged over an area of a square centimetre in the region | s-reeeiviag the highest dose; however, with very : = : ° . - . ‘narrow beams of extremely hich intensity, such © as those used for X-ray analysis, the value of : such en average dose may be misleading, and protection measures have to be based on ° FO qualitative considerations. , . ; wi ICRP Publication 9 Recommendations of the International Committee on Radiological Protection . (adopted September 17, 1965) -