【摘要】 考虑了Ｔ（ｄ，ｎ）４Ｈｅ快中子与天然铁的所有反应后，用ＭｏｎｔｅＣａｒｌｏ方法建立了适用于天然铁球壳的中子输运程序；计算了快中子源屏蔽铁的不同厚度的透射中子能谱分布，统计了不同屏蔽厚度的各种透射率，均得到了满意的结果，与国外数据相比不仅符合，而且为选择铁屏蔽厚度提供了科学依据．更多还原

【Abstract】 A fastneutron transport code has been made up to simulate fastneutrons induced by all reactons in a spherical shell of natural iron, which were yielded by T(d,n)4He reaction. Relations between the energy distributions of transmitted neutrons and the different thicknesses of the ironshielded fastneutron source have been calculated. The transmissivities of the different shielded thicknesses have been counted, and more satisfying results have been obtained. The results not only are in agreement with foreign data adopted, but also provide a scientific basis for the thicknesses of shielded iron更多还原