CN116027381B - Neutron measurement method capable of matching energy response and automatically switching measuring ranges - Google Patents
Neutron measurement method capable of matching energy response and automatically switching measuring ranges Download PDFInfo
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Abstract
The invention discloses a neutron measurement method for matching energy response and automatically switching measuring ranges, which comprises the following steps: 1. acquiring an energy response correction coefficient; 2. acquiring a sensitivity correction coefficient; 3. acquiring a dead time correction coefficient; 4. acquiring a weight correction coefficient of a low-range detector and a weight correction coefficient of a high-range detector; step five, acquiring a working mode judgment coefficient; 6. the neutron measured dose rate is acquired in different modes of operation. The method has simple steps and reasonable design, can be applied to energy response correction, sensitivity correction, dead time correction and weight correction of a plurality of detectors, and can perform range switching, so that the instrument faces neutrons with different energy and dose rates, has better applicability, and the measuring result of the neutron dose rate is more accurate by multi-coefficient correction.
Description
Technical Field
The invention belongs to the technical field of nuclear radiation measuring instruments, and particularly relates to a neutron measuring method capable of matching energy response and automatically switching measuring ranges.
Background
The existing neutron dose rate instrument is generally composed of a single detector, a traditional sensitivity correction measurement result is used in the aspect of a neutron measurement method, and after the corresponding counting rate of the detector is obtained through calibration of the detector in a standard neutron measurement laboratory, the sensitivity is obtained through a simple method. This approach is inherently simple and does not take into account the physical properties of the neutrons, and when the neutron energy is high, the measurement results are severely distorted without energy response correction, so that correction of the energy response is necessary.
Therefore, there is a need for a neutron measurement method with an automatic switching range matching energy response, which can be applied to energy response correction, sensitivity correction, dead time correction and weight correction of multiple detectors, and can perform range switching, so that the instrument faces neutrons with different energies and dose rates, has better applicability, and the multi-coefficient correction enables the measurement result of the neutron dose rate to be more accurate.
Disclosure of Invention
The invention aims to solve the technical problems of providing a neutron measurement method capable of matching energy response and automatically switching the measuring range, which has simple steps and reasonable design, can be applied to energy response correction, sensitivity correction, dead time correction and weight correction of a plurality of detectors, and can switch the measuring range, so that the instrument faces neutrons with different energy and dose rates, has better applicability, and the measuring result of the neutron dose rate is more accurate by multi-coefficient correction.
In order to solve the technical problems, the invention adopts the following technical scheme: the neutron measurement method of the automatic switching range of matching energy response is characterized in that a device adopted by the method is a double neutron detector, the double neutron detector comprises a low range detector and a high range detector, the dosage rate range measured by the low range detector is 0.09 mu Sv/h-9.51 mu Sv/h, and the dosage rate range measured by the high range detector is 10810 mu Sv/h-1100000 mu Sv/h; the method comprises the following steps:
step one, obtaining an energy response correction coefficient:
When the low-range detector and the high-range detector work normally, an energy response correction coefficient K 1 of the low-range detector and an energy response correction coefficient K 2 of the high-range detector are obtained; and the energy response correction coefficient K 4 of the high-range detector is obtained when the high-range detector works normally when the low-range detector is closed;
step two, acquiring a sensitivity correction coefficient:
When the low-range detector and the high-range detector work normally, a sensitivity correction coefficient R 1 of the low-range detector and a sensitivity correction coefficient R 2 of the high-range detector are obtained; and acquiring a sensitivity correction coefficient R 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed;
Step three, acquiring a dead time correction coefficient:
when the low-range detector and the high-range detector work normally, acquiring a dead time correction coefficient T 1 of the low-range detector and a dead time correction coefficient T 2 of the high-range detector; and acquiring a dead time correction coefficient T 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed;
Step four, acquiring a weight correction coefficient Q 1 of the low-range detector and a weight correction coefficient Q 2 of the high-range detector;
Step five, acquiring a working mode judgment coefficient N 3, comparing N 3, N 3,max with N 3,min, judging, and when N 3 is larger than N 3,max, normally working in a working mode 1, wherein the low-range detector and the high-range detector are both in normal operation; when N 3,min≤N3≤N3,max is in the working mode 2, the low-range detector and the high-range detector work normally; when the value is more than 0 and less than N 3＜N3,min, in the working mode 3, the high-range detector works normally when the low-range detector is closed; wherein N 3,max represents an upper limit value and N 3,min represents a lower limit value;
step six, obtaining neutron measurement dosage rate under different working modes:
When in the working mode 1, according to the formula Obtaining a neutron measured dose rate S t; wherein, N 1 represents the original count rate measured by the low range detector; n 2 represents the raw count rate measured by the high range detector;
when in operating mode 2, according to the formula Obtaining a neutron measured dose rate S t;
When in operating mode 3, according to the formula A neutron measured dose rate S t is obtained.
The neutron measurement method for matching the energy response and automatically switching the measuring range is characterized by comprising the following steps of: in the first step, the energy response correction coefficient K 1 of the low range detector and the energy response correction coefficient K 2 of the high range detector are obtained, and the specific process is as follows:
Step 101, gradually increasing energy in an ith energy interval range, and measuring by adopting a double neutron detector to obtain the response number of a low-range detector and the response number of a high-range detector under neutrons with different energies;
102, setting the response number of the low-range detector under the jth energy neutron in the ith energy interval range as L-N1 (i, j); wherein i and J are positive integers, J is more than or equal to 1 and less than or equal to J, and J is a positive integer;
Step 103, obtaining an actual dose rate S i,j under the jth energy neutron in the ith energy interval range according to a formula S i,j＝1000×3600×α×10-6; wherein alpha is a conversion coefficient under the j-th energy neutron;
Step 104, according to the formula Obtaining a low-range unit dose response number A i,j under the jth energy neutron in the ith energy interval range;
step 105, according to the formula Obtaining a low-range theoretical correction coefficient K i,j under the jth energy neutron in the ith energy interval range;
Step 106, according to the formula Obtaining a low-range correction coefficient mean value K i,1 in the ith energy interval range;
Step 107, repeating steps 101 to 106 for a plurality of times to obtain a low-range correction coefficient mean value K I,1 in the range of the I-th energy interval; wherein I is a positive integer, and I is more than or equal to 1 and less than or equal to I;
step 108, obtaining a high-range correction coefficient mean value K 1,2,...,Ki,2,...,KI,2 in the range of the I energy intervals according to the methods from step 101 to step 107;
step 109 according to Obtaining the ratioK i,1 and K i,2 and the corresponding ratios thereofStoring; wherein H-N2 (i, j) represents the response number of the high-range detector under the j-th energy neutron in the range of the i-th energy interval;
Step 10A, selecting a corresponding correction coefficient mean value from step 109 as an energy response correction coefficient K 1 of the low-range detector and an energy response correction coefficient K 2 of the high-range detector according to the response number of the low-range detector and the response number of the high-range detector of the field to be detected.
The neutron measurement method for matching the energy response and automatically switching the measuring range is characterized by comprising the following steps of: and step two, when the low-range detector and the high-range detector work normally, acquiring a sensitivity correction coefficient R 1 of the low-range detector and a sensitivity correction coefficient R 2 of the high-range detector, wherein the specific process is as follows:
Step 201, in a standard neutron measurement laboratory, after a double neutron detector is placed at a test point of an a-th known dose rate C a, starting a low-range detector and a high-range detector in the double neutron detector, measuring the a-th original count rate N a by the low-range detector, and measuring the a-th original count rate N a' by the high-range detector; wherein a is a positive integer;
Step 202, according to the formula Obtaining an a-th sensitivity value r a of the low-range detector; wherein T s represents a dead time set point and is 10 -7; meanwhile, according to the formulaObtaining an a-th sensitivity value r a' of the high-range detector;
Step 203, repeating step 201 and step 202 for a plurality of times, and obtaining an A-th sensitivity value r A of the low range detector and an A-th sensitivity value r A' of the high range detector at an A-th known dose rate C A; wherein a is more than or equal to 1 and less than or equal to A; a is a positive integer;
Step 204, according to the formula Obtaining a sensitivity correction coefficient R 1 of the low-range detector; at the same time according to the formulaObtaining a sensitivity correction coefficient R 2 of the high-range detector;
the method comprises the following steps of obtaining a sensitivity correction coefficient R 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed:
And when the low-range detector is closed and the high-range detector works normally, obtaining a sensitivity correction coefficient R 4 of the high-range detector according to the methods described in the steps 201 to 204.
The neutron measurement method for matching the energy response and automatically switching the measuring range is characterized by comprising the following steps of: the dead time correction coefficient T 1 of the low-range detector and the dead time correction coefficient T 2 of the high-range detector are 10 -7 when the low-range detector and the high-range detector work normally;
Acquiring a dead time correction coefficient T 4 of the high-range detector as 10 -7 when the high-range detector works normally when the low-range detector is closed;
And step one, when the middle-low range detector is closed and the high range detector works normally, the energy response correction coefficient K 4 of the high range detector is obtained, and the value is 12.274.
The neutron measurement method for matching the energy response and automatically switching the measuring range is characterized by comprising the following steps of: the weight correction coefficient Q 1 of the low range detector in the working mode 1 has the value range of (1- ζ 1,1+ξ1),ξ1 has the value range of (2 d min,2dmax), wherein d min is the minimum intrinsic error of the low range detector in the double neutron detector, d max is the maximum intrinsic error of the low range detector in the double neutron detector, and the weight correction coefficient Q 2 of the high range detector has the value range of (0, ζ 2),ξ2 has the value range of (2 g min,2gmax);gmin is the minimum intrinsic error of the high range detector in the double neutron detector, g max is the maximum intrinsic error of the high range detector in the double neutron detector);
the value range of the weight correction coefficient Q 1 of the low-range detector in the working mode 2 is (1- ζ 1,1+ξ1), and the value range of the weight correction coefficient Q 2 of the high-range detector is (1- ζ 2,1+ξ2);
The weight correction coefficient Q 4 of the high range detector in the working mode 3 has the value range of (1- ζ 2,1+ξ2).
The neutron measurement method for matching the energy response and automatically switching the measuring range is characterized by comprising the following steps of: in the fifth step, the working mode judgment coefficients N 3、N3,max and N 3,min are obtained, and the specific process is as follows:
Step 501, according to the formula Obtaining a lower limit value N 3,min; where d min represents the minimum intrinsic error of the low range detector and g max represents the maximum intrinsic error of the high range detector; c represents a known dose rate value;
step 502, according to the formula Obtaining an upper limit value N 3,max; where d max represents the maximum intrinsic error of the low range detector and g min represents the minimum intrinsic error of the high range detector.
Step 503, obtaining according to the formulaObtaining a working mode judgment coefficient N 3; wherein,An arithmetic average representing the count rate after correction by the energy response correction factor for 5 measurements by the high range detector,An arithmetic average of the count rate after correction by the energy response correction coefficient representing 5 measurements of the low range detector.
The neutron measurement method for matching the energy response and automatically switching the measuring range is characterized by comprising the following steps of: the arithmetic average of the count rate after correction of the energy response correction coefficient for 5 measurements by the high range detector in step 503The value process of (2) is as follows:
Will be And zero, ifEqual to zero, thenThe value of (2) is set to 0.001; if it isIs not equal to zero, thenIs itself a value.
Compared with the prior art, the invention has the following advantages:
1. when the low-range detector and the high-range detector work normally, the energy response correction coefficient K 1 of the low-range detector and the energy response correction coefficient K 2 of the high-range detector are obtained; and the energy response correction coefficient K 4 of the high-range detector is obtained when the high-range detector works normally when the low-range detector is closed, so that the energy response correction can be carried out according to different neutron energies, and the measurement result is more accurate.
2. The invention obtains the sensitivity correction coefficient of the low-range detector and the sensitivity correction coefficient of the high-range detector; and acquiring the dead time correction coefficient of the low-range detector and the dead time correction coefficient of the high-range detector, and respectively outputting the calibrated dose rate by the low-range detector and the high-range detector after sensitivity and dead time correction.
3. According to the invention, the final corrected dose rate is obtained by further correcting the calibrated dose rate respectively output by the low-range detector and the high-range detector through the weight correction coefficient Q 1 of the low-range detector and the weight correction coefficient Q 2 of the high-range detector.
4. According to the invention, the working mode judgment coefficient N 3 is obtained, and N 3, N 3,max and N 3,min are judged, so that different neutron dosage rates are calculated under three working modes, and the neutron measurement dosage rate is obtained, so that the instrument can automatically switch neutrons with different energies and dosage rates, the applicability is better, and the measurement result is more accurate due to multi-coefficient correction.
In summary, the method has simple steps and reasonable design, can be applied to energy response correction, sensitivity correction, dead time correction and weight correction of a plurality of detectors, and can perform range switching, so that the instrument faces neutrons with different energies and dose rates, has better applicability, and the multi-coefficient correction enables the measurement result of the neutron dose rate to be more accurate.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
A neutron measurement method of matching energy response with automatic switching range as shown in figure 1,
The device adopted by the method is a double neutron detector, the double neutron detector comprises a low-range detector and a high-range detector, the dosage rate range measured by the low-range detector is 0.09 mu Sv/h-9.51 mu Sv/h, and the dosage rate range measured by the high-range detector is 10810 mu Sv/h-1100000 mu Sv/h; the method comprises the following steps:
step one, obtaining an energy response correction coefficient:
When the low-range detector and the high-range detector work normally, an energy response correction coefficient K 1 of the low-range detector and an energy response correction coefficient K 2 of the high-range detector are obtained; and the energy response correction coefficient K 4 of the high-range detector is obtained when the high-range detector works normally when the low-range detector is closed;
step two, acquiring a sensitivity correction coefficient:
When the low-range detector and the high-range detector work normally, a sensitivity correction coefficient R 1 of the low-range detector and a sensitivity correction coefficient R 2 of the high-range detector are obtained; and acquiring a sensitivity correction coefficient R 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed;
Step three, acquiring a dead time correction coefficient:
when the low-range detector and the high-range detector work normally, acquiring a dead time correction coefficient T 1 of the low-range detector and a dead time correction coefficient T 2 of the high-range detector; and acquiring a dead time correction coefficient T 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed;
Step four, acquiring a weight correction coefficient Q 1 of the low-range detector and a weight correction coefficient Q 2 of the high-range detector;
Step five, acquiring a working mode judgment coefficient N 3, comparing N 3, N 3,max with N 3,min, judging, and when N 3 is larger than N 3,max, normally working in a working mode 1, wherein the low-range detector and the high-range detector are both in normal operation; when N 3,min≤N3≤N3,max is in the working mode 2, the low-range detector and the high-range detector work normally; when the value is more than 0 and less than N 3＜N3,min, in the working mode 3, the high-range detector works normally when the low-range detector is closed; wherein N 3,max represents an upper limit value and N 3,min represents a lower limit value;
step six, obtaining neutron measurement dosage rate under different working modes:
When in the working mode 1, according to the formula Obtaining a neutron measured dose rate S t; wherein, N 1 represents the original count rate measured by the low range detector; n 2 represents the raw count rate measured by the high range detector;
when in operating mode 2, according to the formula Obtaining a neutron measured dose rate S t;
When in operating mode 3, according to the formula A neutron measured dose rate S t is obtained.
In this embodiment, in the first step, the energy response correction coefficient K 1 of the low range detector and the energy response correction coefficient K 2 of the high range detector are obtained, and the specific process is as follows:
Step 101, gradually increasing energy in an ith energy interval range, and measuring by adopting a double neutron detector to obtain the response number of a low-range detector and the response number of a high-range detector under neutrons with different energies;
102, setting the response number of the low-range detector under the jth energy neutron in the ith energy interval range as L-N1 (i, j); wherein i and J are positive integers, J is more than or equal to 1 and less than or equal to J, and J is a positive integer;
Step 103, obtaining an actual dose rate S i,j under the jth energy neutron in the ith energy interval range according to a formula S i,j＝1000×3600×α×10-6; wherein alpha is a conversion coefficient under the j-th energy neutron;
Step 104, according to the formula Obtaining a low-range unit dose response number A i,j under the jth energy neutron in the ith energy interval range;
step 105, according to the formula Obtaining a low-range theoretical correction coefficient K i,j under the jth energy neutron in the ith energy interval range;
Step 106, according to the formula Obtaining a low-range correction coefficient mean value K i,1 in the ith energy interval range;
Step 107, repeating steps 101 to 106 for a plurality of times to obtain a low-range correction coefficient mean value K I,1 in the range of the I-th energy interval; wherein I is a positive integer, and I is more than or equal to 1 and less than or equal to I;
step 108, obtaining a high-range correction coefficient mean value K 1,2,...,Ki,2,...,KI,2 in the range of the I energy intervals according to the methods from step 101 to step 107;
step 109 according to Obtaining the ratioK i,1 and K i,2 and the corresponding ratios thereofStoring; wherein H-N2 (i, j) represents the response number of the high-range detector under the j-th energy neutron in the range of the i-th energy interval;
Step 10A, selecting a corresponding correction coefficient mean value from step 109 as an energy response correction coefficient K 1 of the low-range detector and an energy response correction coefficient K 2 of the high-range detector according to the response number of the low-range detector and the response number of the high-range detector of the field to be detected.
In this embodiment, when both the low-range detector and the high-range detector in the second step work normally, the sensitivity correction coefficient R 1 of the low-range detector and the sensitivity correction coefficient R 2 of the high-range detector are obtained, and the specific process is as follows:
Step 201, in a standard neutron measurement laboratory, after a double neutron detector is placed at a test point of an a-th known dose rate C a, starting a low-range detector and a high-range detector in the double neutron detector, measuring the a-th original count rate N a by the low-range detector, and measuring the a-th original count rate N a' by the high-range detector; wherein a is a positive integer;
Step 202, according to the formula Obtaining an a-th sensitivity value r a of the low-range detector; wherein T s represents a dead time set point and is 10 -7; meanwhile, according to the formulaObtaining an a-th sensitivity value r a' of the high-range detector;
Step 203, repeating step 201 and step 202 for a plurality of times, and obtaining an A-th sensitivity value r A of the low range detector and an A-th sensitivity value r A' of the high range detector at an A-th known dose rate C A; wherein a is more than or equal to 1 and less than or equal to A; a is a positive integer;
Step 204, according to the formula Obtaining a sensitivity correction coefficient R 1 of the low-range detector; at the same time according to the formulaObtaining a sensitivity correction coefficient R 2 of the high-range detector;
the method comprises the following steps of obtaining a sensitivity correction coefficient R 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed:
And when the low-range detector is closed and the high-range detector works normally, obtaining a sensitivity correction coefficient R 4 of the high-range detector according to the methods described in the steps 201 to 204.
In the embodiment, when the low-range detector and the medium-range detector both work normally, the dead time correction coefficient T 1 of the low-range detector and the dead time correction coefficient T 2 of the high-range detector are both 10 -7;
Acquiring a dead time correction coefficient T 4 of the high-range detector as 10 -7 when the high-range detector works normally when the low-range detector is closed;
And step one, when the middle-low range detector is closed and the high range detector works normally, the energy response correction coefficient K 4 of the high range detector is obtained, and the value is 12.274.
In the embodiment, the weight correction coefficient Q 1 of the low range detector in the working mode 1 has a value range (1- ζ 1,1+ξ1),ξ1 has a value range of (2 d min,2dmax), wherein d min is the minimum intrinsic error of the low range detector in the dual neutron detector, d max is the maximum intrinsic error of the low range detector in the dual neutron detector, and the weight correction coefficient Q 2 of the high range detector has a value range (0, ζ 2),ξ2 has a value range (2 g min,2gmax);gmin is the minimum intrinsic error of the high range detector in the dual neutron detector, and g max is the maximum intrinsic error of the high range detector in the dual neutron detector);
the value range of the weight correction coefficient Q 1 of the low-range detector in the working mode 2 is (1- ζ 1,1+ξ1), and the value range of the weight correction coefficient Q 2 of the high-range detector is (1- ζ 2,1+ξ2);
The weight correction coefficient Q 4 of the high range detector in the working mode 3 has the value range of (1- ζ 2,1+ξ2).
In the embodiment, in the fifth step, the working mode judgment coefficients N 3、N3,max and N 3,min are obtained, and the specific process is as follows:
Step 501, according to the formula Obtaining a lower limit value N 3,min; where d min represents the minimum intrinsic error of the low range detector and g max represents the maximum intrinsic error of the high range detector; c represents a known dose rate value;
step 502, according to the formula Obtaining an upper limit value N 3,max; where d max represents the maximum intrinsic error of the low range detector and g min represents the minimum intrinsic error of the high range detector.
Step 503, obtaining according to the formulaObtaining a working mode judgment coefficient N 3; wherein,An arithmetic average representing the count rate after correction by the energy response correction factor for 5 measurements by the high range detector,An arithmetic average of the count rate after correction by the energy response correction coefficient representing 5 measurements of the low range detector.
In this embodiment, the arithmetic average of the count rate after correction of the energy response correction coefficient is measured 5 times by the high-range detector in step 503The value process of (2) is as follows:
Will be And zero, ifEqual to zero, thenThe value of (2) is set to 0.001; if it isIs not equal to zero, thenIs itself a value.
In the embodiment, the value of C is 0.09 mu Sv/h-1100000 mu Sv/h in actual use.
In this example, it is further preferable that the known dose rate value C is 100. Mu.Sv/h.
In this embodiment, in actual use, the value of I is 7, and the 7 energy intervals range, i.e. 7 energy orders of magnitude, are 1E-8 to 1E-7,1E-7 to 1E-5,1E-5 to 1E-2,1E-2 to 1E-1,1E-1 to 1E0,1E0 to 1E1,1E1 to 2E1, respectively.
In this example, the unit dose response numbers in Table 1 were obtained in the energy interval range of 0.025eV to 20MeV in actual use.
TABLE 1 unit dose response number
In this embodiment, the J value in the [1E-8,1E-7] energy interval range is 3, (1E-7,1E-5 ] energy interval range is 2, (1E-5 to 1E-2] energy interval range is 3, (1E-2 to 1E-1] energy interval range is 1, (1E-1 to 1E0] energy interval range is 1, (1E 0 to 1E 1) energy interval range is 1, and the J value in the [1E1 to 2E1] energy interval range is 3.
In this embodiment, the average value of the correction coefficients in table 2 is obtained through step 105 and step 106, as follows:
TABLE 2 mean value of correction coefficients
In this embodiment, in order to obtain more accurate measurement results in the second step, the a known dose rates include each energy order, i.e. one test point is selected from each energy order for testing.
In summary, the method has simple steps and reasonable design, can be applied to energy response correction, sensitivity correction, dead time correction and weight correction of a plurality of detectors, and can perform range switching, so that the instrument faces neutrons with different energies and dose rates, has better applicability, and the multi-coefficient correction enables the measurement result of the neutron dose rate to be more accurate.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (5)
1. The neutron measurement method of the automatic switching range of matching energy response is characterized in that a device adopted by the method is a double neutron detector, the double neutron detector comprises a low range detector and a high range detector, the dosage rate range measured by the low range detector is 0.09 mu Sv/h-9.51 mu Sv/h, and the dosage rate range measured by the high range detector is 10810 mu Sv/h-1100000 mu Sv/h; the method comprises the following steps:
step one, obtaining an energy response correction coefficient:
When the low-range detector and the high-range detector work normally, an energy response correction coefficient K 1 of the low-range detector and an energy response correction coefficient K 2 of the high-range detector are obtained; and the energy response correction coefficient K 4 of the high-range detector is obtained when the high-range detector works normally when the low-range detector is closed;
step two, acquiring a sensitivity correction coefficient:
When the low-range detector and the high-range detector work normally, a sensitivity correction coefficient R 1 of the low-range detector and a sensitivity correction coefficient R 2 of the high-range detector are obtained; and acquiring a sensitivity correction coefficient R 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed;
Step three, acquiring a dead time correction coefficient:
when the low-range detector and the high-range detector work normally, acquiring a dead time correction coefficient T 1 of the low-range detector and a dead time correction coefficient T 2 of the high-range detector; and acquiring a dead time correction coefficient T 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed;
Step four, acquiring a weight correction coefficient of the low-range detector and a weight correction coefficient of the high-range detector;
Step five, acquiring a working mode judgment coefficient N 3, comparing N 3, N 3,max with N 3,min, judging, and when N 3 is larger than N 3,max, normally working in a working mode 1, wherein the low-range detector and the high-range detector are both in normal operation; when N 3,min≤N3≤N3,max is in the working mode 2, the low-range detector and the high-range detector work normally; when the value is more than 0 and less than N 3＜N3,min, in the working mode 3, the high-range detector works normally when the low-range detector is closed; wherein N 3,max represents an upper limit value and N 3,min represents a lower limit value;
step six, obtaining neutron measurement dosage rate under different working modes:
When in the working mode 1, according to the formula Obtaining a neutron measured dose rate S t; wherein, N 1 represents the original count rate measured by the low range detector; n 2 represents the raw count rate measured by the high range detector;
when in operating mode 2, according to the formula Obtaining a neutron measured dose rate S t;
When in operating mode 3, according to the formula Obtaining a neutron measured dose rate S t;
the weight correction coefficient Q 1 of the low range detector in the working mode 1 has the value range of (1- ζ 1,1+ξ1),ξ1 has the value range of (2 d min,2dmax), wherein d min is the minimum intrinsic error of the low range detector in the double neutron detector, d max is the maximum intrinsic error of the low range detector in the double neutron detector, and the weight correction coefficient Q 2 of the high range detector has the value range of (0, ζ 2),ξ2 has the value range of (2 g min,2gmax);gmin is the minimum intrinsic error of the high range detector in the double neutron detector, g max is the maximum intrinsic error of the high range detector in the double neutron detector);
the value range of the weight correction coefficient Q 1 of the low-range detector in the working mode 2 is (1- ζ 1,1+ξ1), and the value range of the weight correction coefficient Q 2 of the high-range detector is (1- ζ 2,1+ξ2);
The value range of the weight correction coefficient Q 4 of the high-range detector in the working mode 3 is (1- ζ 2,1+ξ2);
In the fifth step, the working mode judgment coefficients N 3、N3,max and N 3,min are obtained, and the specific process is as follows:
Step 501, according to the formula Obtaining a lower limit value N 3,min; where d min represents the minimum intrinsic error of the low range detector and g max represents the maximum intrinsic error of the high range detector; c represents a known dose rate value;
step 502, according to the formula Obtaining an upper limit value N 3,max; where d max represents the maximum intrinsic error of the low range detector and g min represents the minimum intrinsic error of the high range detector;
step 503, obtaining according to the formula Obtaining a working mode judgment coefficient N 3; wherein,An arithmetic average representing the count rate after correction by the energy response correction factor for 5 measurements by the high range detector,An arithmetic average of the count rate after correction by the energy response correction coefficient representing 5 measurements of the low range detector.
2. A neutron measurement method of matching an energy response to an automatically switched range as defined in claim 1, wherein: in the first step, the energy response correction coefficient K 1 of the low range detector and the energy response correction coefficient K 2 of the high range detector are obtained, and the specific process is as follows:
Step 101, gradually increasing energy in an ith energy interval range, and measuring by adopting a double neutron detector to obtain the response number of a low-range detector and the response number of a high-range detector under neutrons with different energies;
102, setting the response number of the low-range detector under the jth energy neutron in the ith energy interval range as L-N1 (i, j); wherein i and J are positive integers, J is more than or equal to 1 and less than or equal to J, and J is a positive integer;
Step 103, obtaining an actual dose rate S i,j under the jth energy neutron in the ith energy interval range according to a formula S i,j＝1000×3600×α×10-6; wherein alpha is a conversion coefficient under the j-th energy neutron;
Step 104, according to the formula Obtaining a low-range unit dose response number A i,j under the jth energy neutron in the ith energy interval range;
step 105, according to the formula Obtaining a low-range theoretical correction coefficient K i,j under the jth energy neutron in the ith energy interval range;
Step 106, according to the formula Obtaining a low-range correction coefficient mean value K i,1 in the ith energy interval range;
Step 107, repeating steps 101 to 106 for a plurality of times to obtain a low-range correction coefficient mean value K I,1 in the range of the I-th energy interval; wherein I is a positive integer, and I is more than or equal to 1 and less than or equal to I;
step 108, obtaining a high-range correction coefficient mean value K 1,2,...,Ki,2,...,KI,2 in the range of the I energy intervals according to the methods from step 101 to step 107;
step 109 according to Obtaining the ratioK i,1 and K i,2 and the corresponding ratios thereofStoring; wherein H-N2 (i, j) represents the response number of the high-range detector under the j-th energy neutron in the range of the i-th energy interval;
Step 10A, selecting a corresponding correction coefficient mean value from step 109 as an energy response correction coefficient K 1 of the low-range detector and an energy response correction coefficient K 2 of the high-range detector according to the response number of the low-range detector and the response number of the high-range detector of the field to be detected.
3. A neutron measurement method of matching an energy response to an automatically switched range as defined in claim 1, wherein: and step two, when the low-range detector and the high-range detector work normally, acquiring a sensitivity correction coefficient R 1 of the low-range detector and a sensitivity correction coefficient R 2 of the high-range detector, wherein the specific process is as follows:
Step 201, in a standard neutron measurement laboratory, after a double neutron detector is placed at a test point of an a-th known dose rate C a, starting a low-range detector and a high-range detector in the double neutron detector, measuring the a-th original count rate N a by the low-range detector, and measuring the a-th original count rate N a' by the high-range detector; wherein a is a positive integer;
Step 202, according to the formula Obtaining an a-th sensitivity value r a of the low-range detector; wherein T s represents a dead time set point and is 10 -7; meanwhile, according to the formulaObtaining an a-th sensitivity value r a' of the high-range detector;
Step 203, repeating step 201 and step 202 for a plurality of times, and obtaining an A-th sensitivity value r A of the low range detector and an A-th sensitivity value r A' of the high range detector at an A-th known dose rate C A; wherein a is more than or equal to 1 and less than or equal to A; a is a positive integer;
Step 204, according to the formula Obtaining a sensitivity correction coefficient R 1 of the low-range detector; at the same time according to the formulaObtaining a sensitivity correction coefficient R 2 of the high-range detector;
the method comprises the following steps of obtaining a sensitivity correction coefficient R 4 of the high-range detector when the high-range detector works normally when the low-range detector is closed:
And when the low-range detector is closed and the high-range detector works normally, obtaining a sensitivity correction coefficient R 4 of the high-range detector according to the methods described in the steps 201 to 204.
4. A neutron measurement method of matching an energy response to an automatically switched range as defined in claim 1, wherein: the dead time correction coefficient T 1 of the low-range detector and the dead time correction coefficient T 2 of the high-range detector are 10 -7 when the low-range detector and the high-range detector work normally;
Acquiring a dead time correction coefficient T 4 of the high-range detector as 10 -7 when the high-range detector works normally when the low-range detector is closed;
And step one, when the middle-low range detector is closed and the high range detector works normally, the energy response correction coefficient K 4 of the high range detector is obtained, and the value is 12.274.
5. A neutron measurement method of matching an energy response to an automatically switched range as defined in claim 1, wherein: in step 503, the process of taking the arithmetic mean value H-N2 of the counting rate after the correction of the energy response correction coefficient measured 5 times by the high-range detector is as follows:
judging H-N2 and zero, and if H-N2 is equal to zero, setting the value of H-N2 to be 0.001; if H-N2 is not equal to zero, H-N2 is itself.
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