Wide-energy-spectrum BF3 long neutron counter measurement system
A measurement system and counter technology, applied in the field of nuclear technology, can solve problems such as low detection efficiency and low sensitivity of long counters
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Embodiment 1
[0045] Embodiment 1 A kind of BF of wide energy spectrum 3 long neutron counter
[0046] A Broad Spectrum BF 3 A long neutron counter, the long neutron counter is composed of an outer moderator layer 3, an absorber layer 4, an inner moderator layer 6, a counting tube 7 and an air channel 2; the outer moderator layer 3 and the absorber layer 4 They are all in the shape of a hollow barrel, the absorbing layer 4 is nested in the outer moderator layer 3, the inner moderator layer 6 is embedded in the absorbing layer 4; the counting tube 7 is in the shape of a hollow cylinder, and is arranged through the outer The central position of the moderator layer 3, the absorption layer 4 and the inner moderator layer 6; the air channel 2 is arranged around the counter tube 7 on the inner moderator layer 6; the top of the inner moderator layer 6 is conical Groove, the air channel 2 is arranged on the cone surface, the number of the air channel 2 is ≥ 1; the inner wall of the absorption lay...
Embodiment 2
[0047] Embodiment 2 A kind of BF3 long neutron counter measuring system and measuring method of wide energy spectrum
[0048] A BF3 long neutron counter measurement system with a wide energy spectrum, the measurement system includes the long neutron counter and an electronic instrument system;
[0049] The long neutron counter is connected with electronic instruments;
[0050] The long neutron counter converts the detected neutron signal into a pulse voltage signal, and transmits the voltage signal to the electronic instrument system;
[0051] In the electronic instrument system, the pulse voltage signal transmitted from the long neutron counter is amplified, threshold value screened, and the number of pulse voltages finally recorded is the number of neutrons recorded by the long neutron counter.
[0052] The measuring method of described long neutron counter measuring system, comprises the steps:
[0053] (1) The long neutron counter is connected with the electronic instrum...
Embodiment 3
[0057] The electronic measurement system of embodiment 3 long neutron counter
[0058] The long neutron counter measurement electronics system consists of a preamplifier, a linear amplifier, a high and low voltage power supply, a single-channel analyzer, and a scaler, such as figure 2 shown.
[0059] Measuring the detection efficiency of a neutron source with a long neutron counter requires knowing the BF 3 Optimum working voltage and electronic instrument performance parameters of proportional counter tube: When the working voltage is 1700V, use 210 The plateau width measured by the Po-α-Be neutron source is 400V, and the plateau slope is <1% per 100V.
[0060] BF first 3 The proportional counter tube detects the neutron signal to generate a voltage pulse signal, which is linearly amplified by the preamplifier and linear amplifier, and then connected to a multi-channel analyzer to obtain the pulse amplitude spectrum, such as image 3 As shown, the pulse amplitude distrib...
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