Objective to investigate the indoor radon concentration and to estimate the exposure dosage in urban area of Suzhou city.
目的了解苏州市区居民室内氡浓度及所致剂量。
Methods: Numerical simulations of the thermal necrosis extent in a target tissue and its dependence on the HIFU exposure dosage have been adopted.
方法：对靶组织热固化体元与超声幅照计量的关系进行了数字模拟研究。
Therefore, such factors having effect on the precision of deep UV lithography as diffraction effect, exposure dosage, wavelength and distribution of fly's eyes lens etc.
同时由于紫外光的衍射效应，获得高精度的大高宽比结构并不容易。本文深入研究了影响紫外深度光刻图形转移精度的如下因素；
Poor outcomes are largely related not only to dosage but to a woman's stage of pregnancy at the time of exposure; first and second trimesters are of the most concern.
缺陷在很大程度上不仅取决于照射的剂量还取决于孕妇阶段所受到的照射。最初的三个月和其后三个月是最重要的阶段。
Long term exposure to insecticides with small dosage was harmful to unstable cells.
长期小剂量接触农药对不稳定细胞有损害。
The experiment showed that exposure to a low dosage of virus particles resulted in a small number host infections (20%).
实验表明，与低剂量病毒粒子接触，导致少数宿主感染(20%)。
The recommended dosage is 800~1000 U/d of plain vitamin D for healthy old people and up to 2000 U/d for people with osteoporosis, obesity, poor sun exposure, and malabsorption.
推荐老年人每天补充800~1000U普通维生素D，骨质疏松患者、肥胖、缺乏日照和吸收不良的人可酌情增加至2000 U。
The recommended dosage is 800~1000 U/d of plain vitamin D for healthy old people and up to 2000 U/d for people with osteoporosis, obesity, poor sun exposure, and malabsorption.
推荐老年人每天补充800~1000U普通维生素D，骨质疏松患者、肥胖、缺乏日照和吸收不良的人可酌情增加至2000 U。
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