公开(公告)号：JPS55116287A

公开(公告)日：1980-09-06

申请号：JP2344379

申请日：1979-03-02

Applicant: ALOKA CO LTD

Inventor： MINOWA TADAHIRO ,  MATSUBARA SHIYOUHEI

IPC: G01T1/20

Abstract: PURPOSE:To improve accuracy of radiation measurement by dividing the path of the liquid to be measured by a shading film to control the Charenkov ray-incidence on the scintillator, which ray is generated in one of the shunt paths whereby the detection error is eliminated. CONSTITUTION:A scintillator 12 in a radiation detector is disposed by a conductor tube 10 which conducts radioactive-material-containing liquid and the path of liquid to be measured 14 is devided into the first and second shunt paths 18, 20 by shading film 16 which consists of silver or aluminum metallic film. Therefore, the shading film 16 is placed between the first shunt path 18 and the scintillator 12. Cherenkov ray which is generated in the first shunt path 18 is shaded by the shading film 16 and the ray will not reach the scintillator 12. Therefore, the detecting quantity of cherenkov ray is remarkably reduced and the radiation having a wide ranged energy can be measured with high accuracy.

公开(公告)号：JPS5713379A

公开(公告)日：1982-01-23

申请号：JP8782880

申请日：1980-06-30

Applicant: ALOKA CO LTD

Inventor： IKEDA TERUO ,  MINOWA TADAHIRO

IPC: H01J47/00 ,  G01T1/185 ,  H01J47/02

Abstract: PURPOSE:To prevent the occurrence of a measurement error due to the contamination of a collector pole with a radioactive gaseous substance being ventilated, by a method wherein an intermediate electrode is placed between an inner wall of an outer case and the collector pole. CONSTITUTION:An intermediate electrode 20 is placed between an inner wall of an outer case and a collector pole 12 in the outer case 10. A distance between the intermediate electrode 20 and the outer case 10 is set so as to exceed a maximum range in the air of a radioactive material. The intermediate electrode is formed in a spiral, and a terminal 20a is connected to a high-voltage power source 16. An ionization current measuring device 18 is coupled to a terminal 12a of the collector pole 12. A heating power source 28 heats the collector pole and the intermediate electrode 20. A radioactive gaseous substance is fed into the outer case 10 from an inlet port 10a and is exhausted through an outlet port 11b. A current is applied to the radioactive material at the inside of the intermediate electrode 20, and an ionization current flows from the collector pole 12 to the ionization current measuring device 18. This prevents the contamination of the collector pole by the radioactive material and the occurrence of a measurement error.