公开(公告)号：US4362940A

公开(公告)日：1982-12-07

申请号：US144840

申请日：1980-04-29

Applicant: Peter R. Almond

Inventor： Peter R. Almond

IPC: H01J47/02 ,  H01J39/28

CPC classification number: H01J47/02

Abstract: The present invention provides a zero displacement ionization chamber for use in calibrating radiation units. The ionization chamber includes a thimble chamber having first and second electrodes with predetermined thickness and length separated from one another by a pre-defined air gap. The material density and air gap density are balanced by weighting the normal path lengths of radiation rays through the thimble chamber, thereby affecting the thimble chamber having an overall density substantially the same as water thus yielding a zero displacement when placed in water. The first and second electrodes are further electrically connected to a power source for creating an ionization effect when receiving radiation rays in the air gap so that a signal indicative of the radiation exposure may be detected by an electrical connection to one of the electrodes.

Abstract translation: 本发明提供了用于校准辐射单元的零置换电离室。 电离室包括具有预定厚度和长度的第一和第二电极与预定义的气隙彼此隔开的顶针室。 材料密度和气隙密度通过加权通过套管室的辐射线的正常路径长度来平衡，从而影响具有与水基本相同的总体密度的套管室，从而当放置在水中时产生零位移。 第一和第二电极进一步电连接到电源，用于当在气隙中接收辐射线时产生电离效应，使得可以通过与其中一个电极的电连接来检测表示辐射暴露的信号。