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实验观察是选用70±10天龄的纯种雌性大白鼠600多只进行的。仅容许鼻腔暴露吸入高温焙烧的~(239)PuO_2和氧化铍的气溶胶,30～180分钟。氧化铍的质量中值空气动力学直径是1.10±0.17微米。~(239)PuO_2的活性中值空气动力学直径是2.67±0.64微米。实验分为12组、两个对照组,共128只动物。吸入~(239)PuO_2气溶胶的三个组共181只动物,吸入
Experimental observation is the selection of 70 ± 10 days of purebred female rats carried out more than 600. Aerosol exposure to inhalation of high-temperature calcined ~ (239) PuO_2 and beryllia oxide is only permitted in the nasal cavity for 30 to 180 minutes. The mass median aerodynamic diameter of beryllium oxide is 1.10 ± 0.17 microns. The active median aerodynamic diameter of ~ (239) PuO 2 was 2.67 ± 0.64 μm. The experiment was divided into 12 groups, two control groups, a total of 128 animals. A total of 181 animals in the three groups inhaled the ~ (239) PuO 2 aerosol inhaled