GAS-FILLED NEUTRON TUBE Russian patent published in 2009 - IPC H01J27/04 

FIELD: oil and gas production.

SUBSTANCE: invention is related to gas filled neutron tubes for logging works on oil, gas and ore deposits. Gas-filled neutron tube comprises body, in which the following components are installed - immersible ion-optic system, target, magnet-gas-discharge ion source with disk magnet of cathode and annular magnet around hollow anti-cathode. Annular magnet is made of two semi-rings and is fixed by spring metal non-magnet brace and is installed in anti-cathode body in external slot of body, and disk magnet is installed in cavity of throughput insulator of ion source, its magnet field is directed towards magnetic field of disk magnet and is selected based on the following condition: Bd≥2B_c≥240 mTl, where: B_d is maximum magnet inductance of disk magnet; B_c is maximum magnet inductance of annular magnet.

EFFECT: increased neutron flow, reduced power consumption, decrease of working pressure, improved reliability and resource of operation, smaller diametre of device.

2 cl, 1 tbl, 3 dwg