CN110082811B - Energy track counting reassignment process and method for gamma spectrum analysis - Google Patents
Energy track counting reassignment process and method for gamma spectrum analysis Download PDFInfo
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Abstract
The invention relates to an energy track counting reassignment process and method for gamma spectrum analysis, comprising the following steps: determining two mutually parallel line segments with equal length, and respectively naming the two line segments as AB and MN, wherein MN represents an integer energy channel, AB represents a non-integer energy channel and is original data; the method comprises the following steps of (1) partitioning an AB line segment into a plurality of energy intervals, selecting a midpoint in the middle of each energy interval, wherein end points and the midpoint of each interval are nodes, and the nodes are marked by letters; partitioning the MN line segment into a plurality of target intervals, and adopting letter identification at the end points of the target intervals; and selecting the end point of the corresponding target interval as a vertical line towards the line segment AB, adopting letter identification for the foot on the line segment AB, obtaining the length ratio in the energy channel where the foot is located through the position of the foot, and calculating the integral counting of the energy channel in the target interval. And the integral operation is carried out on the non-integral energy channel address, so that the gamma spectrum analysis is conveniently carried out by a deconvolution iterative algorithm based on a response matrix, and the gamma spectrum analysis efficiency is improved.
Description
Technical Field
The invention relates to the fields of gamma spectrometers, gamma energy spectrum analysis, in-situ measurement and in-water radioactivity monitoring, in particular to an energy channel counting redistribution process and method for gamma spectrum analysis.
Background
In the process of gamma spectrometer energy spectrum analysis, the spectrometer is usually calibrated for energy. After calibration, since the energy calibration coefficients are usually fit by polynomial, the coefficients are usually floating point numbers which cannot be predicted in advance, and thus the addresses are changed from integer numbers to floating point numbers through the energy calibration. It is not beneficial to the gamma spectrum analysis based on the deconvolution iterative algorithm of the response matrix, nor to the comparison of the monte carlo simulation result with the experimental result, because the abscissa of the typical monte carlo simulation result is usually the integer energy address boundary. Therefore, after the pulse height spectrum measured by experiments passes through the energy scale, the integer operation is carried out on the non-integer energy channel address, the abscissa of the energy spectrum data after the energy scale is non-integer energy, the non-integer energy channel is converted into the integer energy, and meanwhile, the full spectrum counting rate and the spectrum shape information are guaranteed not to be lost.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an energy track counting reassignment process and method for gamma spectrum analysis.
In order to achieve the purpose, the invention adopts the technical scheme that:
a trace count reassignment process and method for gamma spectrum analysis comprising the steps of:
determining two parallel line segments with equal length, and respectively naming the two line segments as AB and MN, wherein MN represents an integer energy channel, AB represents a non-integer energy channel and is original data;
the method comprises the following steps of (1) partitioning an AB line segment into a plurality of energy intervals, selecting a midpoint in the middle of each energy interval, wherein end points and the midpoint of each interval are nodes, and the nodes are marked by letters;
partitioning the MN line segment into a plurality of target intervals, and adopting letter identification at the end points of the target intervals;
and selecting the end point of the corresponding target interval as a vertical line towards the line segment AB, adopting letter identification for the foot on the line segment AB, obtaining the length ratio in the energy channel where the foot is located through the position of the foot, and calculating the integral counting of the energy channel in the target interval.
Further, four nodes D, F, H and J are selected from the line segment AB, the line segment AB is divided into five energy intervals of AD, DF, FH, HJ and JB, and C, E, G, I and K are selected as the midpoints of the five energy intervals respectively;
two nodes O and P are selected on the line segment MN, and the MN is divided into three target intervals of MO, OP and PN.
Furthermore, the nodes O and P respectively make vertical lines towards the line segment AB, and the vertical feet on the line segment AB are respectively W and X.
Furthermore, the energy channel of the target interval MO is an AW energy channel on the AB line segment, and the energy channel of the MP is an AX energy channel on the AB line segment.
Further, the total count within the target interval OP = total count within MP-total count within MO.
Furthermore, the positions of nodes O and P on the MN and four nodes D, F, H and J on the AB are selected randomly.
Furthermore, the MO counting method of the target interval is to directly count the counts in the complete original energy interval AD and add the length ratio of the DW in the energy channel DF to the count in the channel, i.e. the MO counting method of the target interval is to multiply the counts in the energy channel DF by the length ratio of the DW in the energy channel DF, i.e. the MO counting method of the target interval
Can count in the channel.
Further, the target interval PN total count = MN inner total count-MP inner total count.
Further, the method for calculating the total count in the MP is the same as the method for calculating the total count in the MO.
The invention has the beneficial effects that: according to the invention, through the research on the non-integer energy track caused by energy scales in the energy spectrum analysis, the basic property of an integer is fully utilized as a starting point, and through the redistribution of the track address and the counting, a set of effective energy track integer process and method are realized, the integer operation is carried out on the non-integer energy track address, the gamma spectrum analysis is conveniently carried out based on the deconvolution iterative algorithm of a response matrix, the comparison between a Monte Carlo simulation result and an experimental result is facilitated, and the gamma spectrum analysis efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a geometric scale-normalization method for reassignment of energy track counts according to the present invention;
FIG. 2 is a schematic diagram of an intra-lane count reassignment implementation of the present invention;
FIG. 3 is a comparison graph of a test of energy spectrum of an underwater gamma spectrometer with energy trace count redistribution.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1 and fig. 2, a trace count reassignment process and method for gamma spectrum analysis comprises the following steps:
determining two parallel line segments with equal length, and respectively naming the two line segments as AB and MN, wherein MN represents an integer energy channel, AB represents a non-integer energy channel and is original data;
the method comprises the following steps of (1) partitioning an AB line segment into a plurality of energy intervals, selecting a midpoint in the middle of each energy interval, wherein end points and the midpoint of each interval are nodes, and the nodes are marked by letters;
partitioning the MN line segment into a plurality of target intervals, and adopting letter identification at the end points of the target intervals;
and selecting the end point of the corresponding target interval as a vertical line towards the line segment AB, adopting letter identification for the foot on the line segment AB, obtaining the length ratio in the energy channel where the foot is located through the position of the foot, and calculating the integral counting of the energy channel in the target interval.
The specific operation is as follows:
selecting four nodes D, F, H and J on a line segment AB, dividing the line segment AB into five energy intervals of AD, DF, FH, HJ and JB, and selecting C, E, G, I and K as the midpoints of the five energy intervals respectively;
two nodes O and P are selected on a line segment MN, the MN is divided into three target intervals MO, OP and PN, the nodes O and P respectively make vertical lines towards the line segment AB, and the vertical legs on the line segment AB are respectively W and X.
The positions of nodes O and P on the MN and four nodes D, F, H and J on the AB are selected randomly, the energy channel of the target interval MO is an AW energy channel on the AB line segment, and the energy channel of the MP is an AX energy channel on the AB line segment.
For the interval MO, AD belongs to a complete energy interval, while DW is less than a complete energy interval. For interval MP, there are three complete energy intervals AD, DF, FH, and HX belongs to the incomplete energy region. Fig. 1 shows the case where the original data interval is smaller than an integer. Cases where the data interval is greater than an integer may also be considered similarly.
The primary purpose of the integer is to redistribute the ordinate counts of the spectral data while maintaining the full spectral count and spectral shape information. For the leftmost new energy channel MO, the count should be made by directly counting the counts in the complete original energy interval AD and adding the length ratio of DW in its energy channel DF multiplied by its in-channel count, i.e. the DW length in its energy channel DF is counted
Can count in the channel.
Thus, the process of one-time energy channel integer counting reallocation is completed. For non-left-end intervals such as OP, since the left end O rarely coincides with the original energy track boundary, the subtraction method is used, i.e. total count in OP = total count in MP-total count in MO. The calculation method of the total count in the MP is similar to that of the total count in the MO, and is not described in detail.
Writing a program according to the block diagram shown in fig. 2 can realize the process of counting redistribution in the energy channels, and mainly uses the above geometric proportion principle;
further, the energy spectrum of the simulated underwater gamma spectrometer is tested by energy channel counting redistribution, and a comparison graph before and after the test is shown in fig. 3:
where the solid line is the simulated original spectrum and the abscissa is an integer, but becomes non-integer after the energy calibration, the energy traces are re-converted to integer counts using the method and process described above. The full spectrum count rate difference is only about 0.6%. There is no change in energy resolution. The full spectrum counting rate and the spectrum shape information are ensured.
The energies and counts taken over the energy range 550keV to 572keV are given in the following table:
processing front and back partial data
It can be seen that the new energy interval counts are accumulated indeed, ensuring that the total count rate is unchanged.
According to the invention, through the research on the non-integer energy track caused by energy scales in the energy spectrum analysis, the basic property of an integer is fully utilized as a starting point, and through the redistribution of the track address and the counting, a set of effective energy track integer process and method are realized, the integer operation is carried out on the non-integer energy track address, the gamma spectrum analysis is conveniently carried out based on the deconvolution iterative algorithm of a response matrix, the comparison between a Monte Carlo simulation result and an experimental result is facilitated, and the gamma spectrum analysis efficiency is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (9)
1. A trace count reassignment process and method for gamma spectrum analysis comprising the steps of:
a. determining two mutually parallel line segments with equal length, and respectively naming the two line segments as AB and MN, wherein MN represents an integer energy channel, AB represents a non-integer energy channel and is original data;
b. dividing the AB line segment into five energy intervals, selecting a midpoint in the middle of the energy intervals, wherein the end points and the midpoint of each interval are nodes, and the nodes are marked by letters;
c. the MN line segment is divided into three target intervals, letter identification is adopted at the end point of the target interval, namely four nodes are selected from the line segment AB, and two nodes are selected from the line segment MN;
d. selecting the end point of the corresponding target interval as a vertical line towards the line segment AB, marking the foot on the line segment AB by letters, obtaining the length ratio in the energy channel where the foot is located through the position of the foot, calculating the integral counting of the energy channel of the target interval, for a new energy channel with the left end point as the leftmost end M, directly counting the whole original energy interval before the foot corresponding to the right end point, adding the length ratio of the line segment between the right end point of the original energy interval and the foot in the whole energy channel where the line segment is located to multiply the in-channel counting, and for the interval with the left end point not being the leftmost end, adopting the method of subtracting the energy channels with the adjacent left end points as the leftmost end M to calculate the counting of the target interval.
2. The energy track counting reassignment process and method for gamma spectrometry according to claim 1, wherein four nodes D, F, H, J are selected on line segment AB, dividing AB into five energy intervals of AD, DF, FH, HJ and JB, and selecting C, E, G, I, K as the midpoints of the five energy intervals respectively;
two nodes O and P are selected on a line segment MN to divide the MN into three target intervals of MO, OP and PN.
3. The energy track count reassignment process and method for gamma spectroscopy according to claim 2 wherein the nodes O, P are respectively perpendicular to line segment AB, where the foot of the perpendicular is W and X respectively.
4. The energy track counting reassignment process and method for gamma spectrum analysis according to claim 3, wherein the energy track of the target interval MO is an AW energy track on AB line segment, and the energy track of MP is an AX energy track on AB line segment.
5. The channel count reassignment process for gamma spectrometry according to claim 4, wherein the total count in target interval OP = MP total count-MO total count.
6. The energy track count reassignment process and method for gamma spectroscopy according to claim 5, wherein the positions of the nodes O, P on MN and the four nodes D, F, H, J on AB are arbitrarily selected.
7. The method of claim 5, wherein the MO count of the target region is directly counted in the complete original energy interval of AD, and the length ratio of DW in its energy channel DF is multiplied by the count in its channel, i.e. DW length ratio is added to the count in its energy channel DF
Can count in the channel.
8. The channel count reassignment procedure and method for gamma spectrometry according to claim 4, wherein target interval PN inner total count = MN inner total count-MP inner total count.
9. The energy track count reassignment process for gamma spectrometry according to claim 7, wherein the total count in MP is calculated in the same way as the total count in MO.
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