The ionizing values measured with the buildup cap of copper is evidendy larger than with the buildup cap of plastic A-150 and the maximum is 14%, but the difference between two groups of the values of Sc is not much evident and all is in the range of 1%.

• 使用铜材平衡帽时,电离室的电离值明显高于使用A-150塑料平衡帽时电离室的电离值,最大高出14%25,但两组Sc值的差异并不显著,均在1%25以内。