Prompt uranium fission neutron logging technique based on epithermal neutron and thermal neutron ratio
A technology of prompt neutron and well logging technology, which is applied in the direction of measuring devices, nuclear radiation exploration, boreholes/well components, etc.
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[0049] The present invention will be described in more detail through the accompanying drawings and specific embodiments below.
[0050] The dual-neutron time spectrometer for uranium fission prompt neutron logging disclosed by the present invention includes a dual-neutron detector, a preamplifier, a shaping and discriminator, a time-spectrum analysis and buffer circuit, a detector high-voltage power supply circuit, a detector Tube low-voltage power supply circuit and other components. Its structure is as image 3 shown.
[0051] (1) Required for making well logging probe 3 He proportional counter tube and double neutron detector.
[0052] When the double neutron detector adopts the upper and lower structure (such as figure 1 shown), two cylindrical 3 He proportional counter tubes make double neutron detectors, and the distance between the detectors should be shortened as far as possible (so that the epithermal neutron attenuation N of the two detectors records E (t ≤20...
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