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    NEUTRON DETECTOR AND ITS USING METHOD
    12.
    发明专利
    NEUTRON DETECTOR AND ITS USING METHOD 失效

    公开(公告)号：JPH09318760A

    公开(公告)日：1997-12-12

    申请号：JP13338896

    申请日：1996-05-28

    Applicant: ALOKA CO LTD

    Inventor： SATO HIROO ,  ONO TAKESHI ,  MITO MASAYASU

    IPC: G01T3/00

    Abstract: PROBLEM TO BE SOLVED: To enhance the sensitivity simultaneously capable of detecting neutron in each neutron energy range. SOLUTION: The neutron detector 8 comprises an outside container 10 formed of a thermal neutron shield member, a thermal neutron and fast neutron detector 12 made of an ionization chamber, and a moderator 14 for moderating thermal neutron by fast neutron. The thermal neutron and fast neutron are detected by the single detector 12. Only the fast neutron is detected in the state that only the detector 12 is contained in the container 10. The fast and intermediate speed neutron are detected in the state that the detector 12 and moderator 14 are contained in the container 10. The detected results are subtracted from one another to obtain the detected result of desired neutron as required.

    RADIATION MEASURING EQUIPMENT
    13.
    发明专利
    RADIATION MEASURING EQUIPMENT 失效

    公开(公告)号：JPH06258444A

    公开(公告)日：1994-09-16

    申请号：JP4931793

    申请日：1993-03-10

    Applicant: ALOKA CO LTD

    Inventor： SATO HIROO ,  ONO TAKESHI ,  MITO MASAYASU

    IPC: G01T1/167 ,  G01T1/185 ,  H01J47/02

    Abstract: PURPOSE:To provide a radiation measuring equipment having a function for measuring radon present in a gas with high sensitivity and a function for measuring radon in real-time. CONSTITUTION:A first ionization chamber 10 comprises an electrode container 18, a current collecting electrode 20, and a first power supply circuit 22 for applying voltage between them. A second ionization chamber 12 comprises a container 26, a substance adsorbing radon, an outer electrode 29, a current collecting electrode 30, and a second power supply circuit 32. The first power supply section 22 applies a negative voltage to the electrode container whereas the second power supply section 32 applies a positive voltage to the outer electrode. Consequently, a negative pulse is generated from the current collecting electrode 20 in the first ionization chamber 10 and a positive pulse is generated from the current collecting electrode 30 in the second ionization chamber 12. A signal processing circuit performs signal processing for every characteristics of these pulses.

    NEUTRON DETECTOR
    19.
    发明专利
    NEUTRON DETECTOR 失效

    公开(公告)号：JPH0513042A

    公开(公告)日：1993-01-22

    申请号：JP15884091

    申请日：1991-06-28

    Applicant: ALOKA CO LTD

    Inventor： SATO HIROO ,  MITO MASAYASU

    IPC: G01T3/00 ,  H01J47/12

    Abstract: PURPOSE:To ensure high sensitivity detection of only epithermal neutrons. CONSTITUTION:A rod-like collector electrode 22 is arranged on the inside of a box-like outside electrode 20, and helium -3 He is sealed therein. The output of the collector electrode 22 is connected to a measurement circuit 30. A moderator 32 such as polyethylene is provided on the lower part of the outside electrode 20, and an absorption layer 34 made of rubber including boron is arranged on the entire circumference of a detector. Thermal neutrons are absorbed by the absorption layer 34 and are not detected thereby. Accelerated neutrons are transmitted through the absorption layer 34 as well as the moderator 32 and are not detected thereby. Since only epithermal neutrons of 0.5-5X10 eV are transmitted through the absorption layer 34 and is moderated by the moderator 32 into thermal neutrons, nuclear reaction occurs and ionized charges are generated, which are detected as pulses.

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