41' 3e10v a dose of r'00 "ad' essentially no cr-inical synptoms 'i11 be experienced.Doses in the range 100 to 2OO rad wou-l-d Lause acute radiation sickness,characterized by nausea, voniting, diarrhoea "rra f.t igl_," to a sma11 fraction of anexposed' Bopur-ation at the l0r^rer end. of the interval and. to the naJority in the uppex end" Damage to b100d ce1ls rri1l resurt in l0vered resistance to infections ard delayed recovery frorn other injuries. rn the interval 2oo to 1+oo rad, about 5 to l-0 per cent fatalities vou-ld. result after aItronln in the lover range and. 90 per cent or moae are expected to becone fatal_ities at the upper range. The 50 pex cent fatality dose is about 300 rad. Radiation "i.r-e"s would in trre niaar-e and upper part of thls interval be intense and those who recover woufd do so onfy after several nonths. Medical t?eatment is already in peacetime of marginal utility and should not be expected to be of any help in -a situatton cooprisi.ng mass radiation injuries, except in the fo"' or paltiative treainent. Doses above )+50 rad shourdbe considered fethal and death wi1l generally occur within a fev weehs. At very high doses (thousands of rads) d.anage to the centraJ_ nervous system vil1 cause convulsions" tremor, ataxia and lethargy, forlowed by death within 1 to r+B hours. Lt2' Radiation will affect menmars and birds in a way similar to humans. The,.c c',ehoraever' some lo rnrer species of animars that wirr" survive doses of tho""rnd"";;';;::?he same holds true for most plants, Induced late cancer: L3' rt is r'rel' knovn that rarBe d.oses of radiation vil1 increase the probabilityof contracting late cancer. Iloffever, eompared to the natural frequency of cancer, smafl doses (i.e. in the range of 10 rad or fess) have so far adde-d stltisticaUyinsignificant or undetectabr-e increases to the natural frequency of cancer, This does not nxean that doses in this range are harnless, and fo" protection purposes a fineaf relationship betveen doses ana proraliiity of contracting r,ate cancer i.susually assued for 1ow $99es, Accoriling to the International Conmission on nadiological Protection (rcnr)" b/ there-wou-ra-t. o." to two cases of lethaf cancer v Fecornnendat ions of the Tntemational cormission on Radiological protection,ICRP Publicat ion 26" 1977.T{A/35 /392 FinEl.l sn llnnex Page lTL per l-o,ooo manrad. (The nanrad is the unit for I'collective dose", defined as the product of average dose and the nwber of people vho have received that dose. Hence 10,000 manrad woutd be for instance t rad to l-0'000 people, 10 rad to 1'000 pebple' etc . ) cenetic effects \\. The genetic effects considered here are hereditary rlefects that vi.Il be
**Analysis**
The text appears to be a scientific report discussing the effects of radiation on human health, including acute radiation sickness, long-term health effects, and genetic effects. The text also mentions medical treatment and radiation protection. Given the focus on health and scientific concepts, it is likely that the text is related to the field of medicine or radiation protection.

**Category**
Health, Science and technology