有三个天然存在的放射系列，即钍系、锕系和铀系。
There are three naturally occurring radioactive series - the thorium series, the actinium series, and the uranium series.
采用MCNP模拟软件和水分对天然伽玛射线的影响实验，对不同水分土壤中铀系和钍系天然伽玛的原始谱进行了模拟运算。
The original spectrum from the soil is simulated by MCNP and the experiment of influence to natural gamma-ray is done.
采用MCNP模拟软件和水分对天然伽玛射线的影响实验，对不同水分土壤中铀系和钍系天然伽玛的原始谱进行了模拟运算。
The original spectrum from the soil is simulated by MCNP and the experiment of influence to natural gamma-ray is done.
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