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同轴圆柱形正比管的末端效应对于绝对测量与能谱测量均有重要影响。许多应用中,必须设法消除这种末端效应,使整个灵敏区域内的电场是均匀的,或者说在灵敏区域内的气体放大是常数。 Curran等用引进场管来消除末端效应。此法具有简便、可靠的优点。 本文测定了用场管法消除端效应的条件,即在不同场管尺寸下,选取了最佳场管电压(或最佳电压比)。用两种方法进行测量:一是在相应场管末端附近的阴极开一云母窗,用准直的~(210)Poα源垂直中心电极入射;另一是用准直的低能γ源垂直中心电极入射,阴
The end effect of a coaxial cylindrical proportional tube has an important influence on absolute measurement and energy spectrum measurement. In many applications, one must try to eliminate this end effect so that the electric field across the sensitive area is uniform, or that the amplification of gas within the sensitive area is constant. Curran and other introduction of field-tube to eliminate the end effect. This method has the advantages of simplicity and reliability. In this paper, the condition of eliminating the end effect by the field tube method is determined, that is, the optimal field tube voltage (or the optimal voltage ratio) is selected under different field tube sizes. Measurements were made in two ways: one was to open a mica window at the cathode near the end of the corresponding field tube, with a vertical center electrode of a collimated 210 Poα source, and a vertical center electrode with a collimated low-energy γ source Incident, overcast