脑型放射病是急性放射病中最严重的一种类型。除胃肠道和造血组织受到极严重损伤外,它的主要病变累及全脑,突出的是小脑颗粒细胞大量固缩以至崩解,脑干、下视丘的变化也比较明显。此外,大脑出现水肿、充血、出血和小血管周围水肿等。因此,在伤后很短时间内就出现一系列中枢神经系统症状,故称脑型放射病。引起脑型放射病的剂量范围,尚无确切的数据。但根据事故病例和动物实验资料分析,当人受到数千或1万拉德以上照射,或全身不均匀照射而头部受到极大剂量照射时,可发生脑型放射病。核爆炸时脑型放射病发生情况脑型放射病,一般在5万吨以下的核爆炸时较为多见;10万吨以上的核爆炸时,处于开阔地面发生了脑型放射病的人员,在三种瞬时杀伤因素的共 Brain-type radiation sickness is the most serious type of acute radiation sickness. In addition to the gastrointestinal tract and hematopoietic tissue was severely damaged, its main lesions involving the whole brain, highlighting a large number of cerebellar granule cells shrink and collapse, brain stem, hypothalamus changes are more obvious. In addition, the brain edema, congestion, bleeding and small blood vessels around the edema. Therefore, in a very short period of time after the injury appeared a series of central nervous system symptoms, so called brain radiation sickness. There is no definitive data on the range of doses that cause brain radiation sickness. However, according to the analysis of accidental cases and animal experimental data, brain-type radiation sickness can occur when a person receives thousands or more rads or more, or the whole body is irradiated with a very large dose. Cerebral radiation sickness during brain explosion Cerebral radiation sickness is more common in nuclear explosions below 50,000 tons; in the case of a nuclear explosion of over 100,000 tons, persons who have had brain-type radiation sickness in an open ground, Killing factor of the total