If the dose of radiation exceeds a certain threshold level, then it can produce acute effects, such as skin redness, hair loss, radiation burns, and acute radiation syndrome (ARS1).

如果辐射剂量超过一定的阈值水平，那么它可以产生，如皮肤发红，脱发，辐射烧伤和和急性辐射综合症(ARS1)等急性影响。

Radiation sickness (or acute radiation syndrome) usually sets in after a whole-body dose of three sieverts-3,000 times the recommended public dose limit per year, Langhorst says.

Langhorst说，辐射疾病(或急性辐射综合征)通常发生于全身辐射水平超过3000毫希以上，为每年公众允许辐射上限的3000倍。

ObjectiveTo determine the clinical curative effect and safety of ultra early intravenous thrombolysis with high-dose urokinase in treatment of acute cerebral infarction.

目的探讨大剂量尿激酶超早期静脉溶栓治疗急性脑梗塞的临床疗效及安全性。