PULSED NETRON WELL LOGGING TECHNIQUES WITH BACK GROUND RADIATION REMOVAL

摘要

A device for oil well prospecting using neutron-gamma rays for investigating characteristics of underground rocks bored and checking the earth stratum and the electrical signal pulse between the start and finish of each neutron pulse consisted of a 1st gating device for transmitting to the calculator input terminal of the inform. signal pulse, 2nd gating device transmitting to calculator input terminal and operating during the neutron pulse. Back-ground γrays of logging stratum checked by nonelastic γrays.