将获得的图像分为不同大小的5个视窗范围，测量直接扫描图像和DRR图像的边界绝对位置误差并计算其几何畸变率。

Geometric distortion in 5 different fields of view (FOV) was calculated by measuring the absolute borderline error of direct scan and coronal digital reconstructed radiograph (DRR).

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用贫化铀裂变室进行绝对裂变率测量。

The absolute fission rates was measured by the depleted uranium fission chamber.

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用小型平板裂变室测量中子穿透实验模型后引发238u绝对裂变率，掌握小空间测量中子技术。

Using uranium fission Chambers of minitype slab in the case of 14 MeV neutrons penetrating through the special experiment model, the pure 238u absolute fission rates are measured.

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