Device and method for calibrating neutron sensitivity of out-of-pile detector
A technology for calibrating devices and detectors, applied in measurement devices, neutron radiation measurement, instruments, etc., can solve the problems of inability to display the exact value of the thermal neutron flux rate outside the reactor, and inability to provide detector sensitivity data, etc. Reliable measurement guarantee, easy operation and accurate measurement results
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Embodiment 1
[0050] Such as figure 1 As shown, the present invention is a neutron sensitivity calibration device for an ex-core detector, which includes: a line neutron source 12, a source storage container 13, a shielding body 2, a moderator 3, a detector positioning hole 5 and a calibration tunnel ; when the calibration device is in a non-working state, the line neutron source 12 is located in the source storage container 13; the source storage container 13 is arranged in a deep underground pit, and the concrete around the deep pit can be used for radiation protection; the detection The device positioning hole 5 is set on the top of the calibration hole;
[0051] The line neutron source 12 is used to generate fast neutrons;
[0052] The shielding body 2 is used to shield the neutron source 12 of the line when the calibration device is in working state, so as to reduce the neutron radiation level;
[0053] The moderator 3 is used to moderate the fast neutrons generated by the line neutr...
Embodiment 2
[0070] Such as figure 1 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a neutron sensitivity calibration method for an ex-core detector, and the calibration method is applied to the neutron sensitivity of an ex-core detector described in Embodiment 1. Sensitivity calibration device; the calibration method includes:
[0071] S1: Accurately measure the thermal neutron injection rate value Φ at the calibration position by the gold activation sheet method (unit: cm -2 ·s -1 );
[0072] S2: Place the detector on the detector displacement positioning device, and move it to the calibration position to obtain the reading N of the detector at this time (unit: A or cps);
[0073] S3: Using the neutron sensitivity calculation formula, calculate the neutron sensitivity S of the detector at the value of the thermal neutron fluence rate (unit: cps / cm -2 ·s -1 or A / cm -2 ·s -1 ); where, the formula for calculating neutron sensitivity...
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