CN211653161U - Gamma ray angle correlation measuring device - Google Patents
Gamma ray angle correlation measuring device Download PDFInfo
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- CN211653161U CN211653161U CN201922200038.4U CN201922200038U CN211653161U CN 211653161 U CN211653161 U CN 211653161U CN 201922200038 U CN201922200038 U CN 201922200038U CN 211653161 U CN211653161 U CN 211653161U
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Abstract
The utility model relates to a nuclear data measuring device, in particular to gamma ray angle correlation measuring device has solved when adopting current gamma ray angle correlation measuring device to measure, consuming time power, can not compromise and the problem that measurement accuracy is difficult to the assurance to the short nuclide early stage of half life and later stage measurement. The device is characterized in that: the device comprises at least six detectors which are circumferentially distributed along a detector arrangement ring; the central axes of the detectors are positioned on the same plane and pass through the circle centers of the detector arranging rings; the detector arrangement ring is a virtual circle; at least one included angle in included angles of central axes of every two detectors of the at least six detectors is 90 degrees; one included angle is 180 degrees; the number of the 8 included angles is more than 90 degrees and less than 180 degrees, or more than 90 degrees and less than 180 degrees, the number of the included angles with the equivalent angle more than 90 degrees and less than 180 degrees after the included angles more than 0 degree and less than 90 degrees are converted according to the angle correlation symmetry principle is added, the sum is more than or equal to 8, and the 8 included angles are different from each other.
Description
Technical Field
The utility model relates to a nuclear data measuring device, in particular to gamma ray angle correlation measuring device.
Background
When the nucleus transitions from the excited state to the ground state, it sometimes completes multiple successive gamma transitions, during which multiple gamma rays are emitted. The angular association relationship of the two cascade gamma rays is directly associated with nuclear data such as nuclear energy level structure, angular momentum, transition order and the like, and is one of key parameters for measuring the nuclear data.
Referring to fig. 1, the conventional gamma ray angle correlation measurement apparatus adopts a dual-detector structure (1, ancient reynean-ann tile, a method for simultaneously measuring gamma transition angle correlation by NaI detector, university thesis of singjiang, university, 2, zhangglong, etc., angle correlation measurement of 60Ni cascade gamma transition, university physics, volume 33, ninth phase, 2014), and the structure thereof includes a fixed detector 01 and a mobile detector 02. In the measuring process, the position of the fixed detector 01 is unchanged, the movable detector 02 is rotated within the range of 90 degrees, different included angles theta are formed between the central axis of the movable detector 02 and the central axis of the fixed detector 01, and then the excited atomic nuclei are measured to obtain angle correlation data of different angles. The existing gamma ray angle correlation measuring device adopting a double-detector structure has the following defects:
(1) because a multi-position time-sharing measurement mode is adopted, at least 8 angles are required to be selected for measurement to obtain a complete angle correlation curve, namely, the measurement is carried out for at least 8 times, and the time and the labor are consumed;
(2) because each measurement needs to reach a rated statistical count, the measurement must be carried out for a long enough time, and most nuclides decay out in the later period for the nuclides with short half-lives, so that the measurement in the early period and the measurement in the later period cannot be compatible;
(3) when the displacement detector 02 is displaced, the state of the displacement detector 02 changes, and in particular the influence of electronic noise variations is disadvantageous for accurate measurements.
Although the above problem can be solved by arranging a plurality of detectors at the same time with the angle θ in the range of 90 ° to 180 °, this brings new problems: on the premise of ensuring the detection efficiency, only 4-5 detectors can be arranged due to the arrangement congestion of the detectors, 4-5 angle associated data are acquired at one time, but the angle associated curve cannot be accurately drawn by only 4-5 angle associated data.
Disclosure of Invention
The utility model aims at providing a gamma ray angle correlation measuring device to when solving and adopting current gamma ray angle correlation measuring device to measure, consuming time power, can not compromise and the measurement accuracy is difficult to the technical problem who guarantees to the short nuclide early and later stage measurement of half-life.
The utility model discloses the technical scheme who adopts is, a gamma ray angle correlation measuring device, its special character lies in:
comprises at least six detectors;
the at least six detectors are distributed along the detector distribution ring in a circumferential manner, and the central axes of the detectors are positioned on the same plane and penetrate through the circle center of the detector distribution ring; the detector arrangement ring is a virtual circle;
at least one included angle formed by the central axes of every two detectors of the at least six detectors is 90 degrees; an included angle is 180 degrees; the number of the 8 included angles is more than 90 degrees and less than 180 degrees, or more than 90 degrees and less than 180 degrees, the number of the included angles with the equivalent angle more than 90 degrees and less than 180 degrees after the included angles more than 0 degree and less than 90 degrees are converted according to the angle correlation symmetry principle is added, the sum is more than or equal to 8, and the angle values of the 8 included angles are not equal to each other.
Further, the detectors are all cylindrical gamma ray detectors.
Furthermore, the cylindrical gamma ray detector is a high-purity germanium detector or a sodium iodide detector or a lanthanum bromide detector or a cadmium zinc telluride detector.
Furthermore, in order to measure the angle correlation data required by drawing the angle correlation curve meeting the precision requirement, reduce the number of detectors as much as possible and save resources, the number of the detectors is six.
Further, defining: the six detectors are respectively a first detector, a second detector, a third detector, a fourth detector, a fifth detector and a sixth detector in turn along the anticlockwise direction; and defines:
θ1the included angle between the central axes of the fifth detector and the second detector is formed;
θ2the included angle between the central axes of the fifth detector and the third detector is formed;
θ3the included angle between the central axes of the No. four detector and the No. six detector is formed;
θ4the included angle between the central axes of the No. six detector and the No. three detector is formed;
θ5the included angle between the central axes of the fifth detector and the sixth detector is formed;
θ6the included angle between the central axes of the fifth detector and the first detector is formed;
θ7the included angle between the central axes of the first detector and the third detector is formed;
θ8the included angle between the central axes of the No. six detector and the No. two detector is formed;
an included angle between the central axes of the first detector and the second detector is 90 degrees; an included angle between the central axes of the first detector and the fourth detector is 180 degrees; theta1、θ2、θ3、θ4、θ5、θ6、θ7、θ8In the method, included angles larger than 0 degrees and smaller than 90 degrees are related according to anglesAfter conversion of the symmetry principle, the equivalent angle is larger than 90 degrees and smaller than 180 degrees, the rest included angles are larger than 90 degrees and smaller than 180 degrees, and the angle values of 8 included angles are not equal to each other.
Further, the diameter of the detector arrangement ring is 500 mm;
theta is described1、θ2、θ3、θ4、θ5、θ6、θ7、θ8Equal to 168 °, 123 °, 115 °, 160 °, 37 °, 102 °, 135 °, 155 °, respectively.
The utility model also discloses a gamma ray angle correlation measurement method based on above-mentioned measuring device, its special character lies in, including following step:
step 1: determining the diameter size of the detector placement ring;
step 2: set up gamma ray angle correlation measuring device
Step 2.1: determining the number of detectors in the gamma ray angle correlation measuring device to be built;
step 2.2: determining an included angle between the central axes of the detectors according to the number of the detectors in the gamma ray angle correlation measuring device to be built determined in the step 2.1;
step 2.3: according to the diameter size of the detector arrangement ring determined in the step 1 and the included angle between the central axes of the detectors determined in the step 2.2, the construction of the gamma ray angle correlation measuring device is completed;
and step 3: placing a gamma radioactive sample to be measured
Placing the gamma radioactive sample to be measured at the circle center position of a detector arrangement ring in the gamma ray angle correlation measuring device built in the step 2;
and 4, step 4: measuring angle related data to complete the measurement
And (3) simultaneously starting all detectors in the gamma ray angle correlation measurement device built in the step (2), measuring, obtaining angle correlation data of at least 10 different included angles, and finishing measurement.
The utility model has the advantages that:
(1) the utility model discloses a gamma ray angle correlation measuring device, ingenious utilization gamma ray angle correlation symmetry nature and circumference distribution space set up six detectors at least according to certain angle on a circumference, can obtain the unequal angle correlation data of 10 at least detector axis contained angles simultaneously, when having avoided the mobile detector to measure, consuming time and power, can't compromise to the short nuclide early stage of half-life and later stage measurement and the emergence of the difficult assurance problem of measurement angle correlation curve accuracy; therefore, the utility model provides an when adopting current gamma ray angle correlation measuring device to measure, consuming time power, can not compromise and the technical problem that measurement accuracy is difficult to guarantee to the short nuclide of half life early and later stage measurement.
(2) The utility model discloses a gamma ray angle correlation measuring device, its angle correlation data more than or equal to 10 that record compare with traditional approach, are showing the measuring accuracy who has improved angle correlation curve.
(3) The utility model discloses a gamma ray angle correlation measuring device sets up six detectors, can acquire 10 angle correlation data at least simultaneously, has improved the cost-effectiveness ratio greatly.
Drawings
FIG. 1 is a schematic diagram of a prior art angle correlation measurement apparatus;
the reference numerals in fig. 1 are explained as follows:
01-fixed detector, 02-mobile detector.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention;
the reference numerals in fig. 2 are explained as follows:
the gamma radioactive sample measuring device comprises a detector 1, a detector 2, a detector 3, a detector three, a detector 4, a detector four, a detector 5, a detector five, a detector 6, a detector six, a detector 7, a detector arrangement ring and a gamma radioactive sample to be measured 8.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 2, the utility model relates to a gamma ray angle correlation measurement device, the structure of which comprises at least six detectors; the at least six detectors are distributed along the detector distribution ring 7 in a circumferential manner, and the central axes of the detectors are all positioned on the same plane and all penetrate through the circle center of the detector distribution ring 7; the detector placement ring 7 is a virtual circle whose diameter size is determined by the designed detection efficiency. At least one included angle formed by the central axes of every two detectors of the at least six detectors is 90 degrees; an included angle is 180 degrees; the number of the 8 included angles is more than 90 degrees and less than 180 degrees, or more than 90 degrees and less than 180 degrees, the number of the included angles with the equivalent angle more than 90 degrees and less than 180 degrees after the included angles more than 0 degree and less than 90 degrees are converted according to the angle correlation symmetry principle is added, the sum is more than or equal to 8, and the angle values of the 8 included angles are not equal to each other. The detectors are preferably all cylindrical gamma ray detectors.
In order to measure the angular correlation data required for drawing the angular correlation curve meeting the precision requirement, reduce the number of detectors as much as possible, and save resources, the number of detectors is preferably six in the present embodiment. Referring to fig. 2, define: the six detectors are a first detector 1, a second detector 2, a third detector 3, a fourth detector 4, a fifth detector 5 and a sixth detector 6 in turn along the anticlockwise direction; and defines: theta1The included angle between the central axes of the fifth detector 5 and the second detector 2 is formed; theta2The included angle between the central axes of the fifth detector 5 and the third detector 3 is formed; theta3The included angle between the central axes of the No. four detector 4 and the No. six detector 6 is formed; theta4The included angle between the central axes of the No. six detector 6 and the No. three detector 3 is formed; theta5The included angle between the central axes of the fifth detector 5 and the sixth detector 6 is formed; theta6The included angle between the central axis of the detector 5 and the central axis of the detector 1 is shown as the fifth; theta7The included angle between the central axes of the first detector 1 and the third detector 3 is formed; theta8The included angle between the central axes of the six-number detector 6 and the second-number detector 2 is formed; an included angle between the central axes of the first detector 1 and the second detector 2 is 90 degrees; an included angle between the central axes of the first detector 1 and the fourth detector 4 is 180 degrees; theta1、θ2、θ3、θ4、θ5、θ6、θ7、θ8In, will be greater than 0 DEG and smallerAfter the included angle of 90 degrees is converted according to the angle correlation symmetry principle, the equivalent angle is larger than 90 degrees and smaller than 180 degrees, the rest included angles are larger than 90 degrees and smaller than 180 degrees, and the angle values of 8 included angles are different from each other. In this embodiment, it is preferable that the diameter of the probe placement ring 7 is 500 mm; theta as above1、θ2、θ3、θ4、θ5、θ6、θ7、θ8Equal to 168 °, 123 °, 115 °, 160 °, 37 °, 102 °, 135 °, 155 °, respectively; wherein theta is5After conversion according to the angle correlation symmetry principle, the equivalent is 180-37 degrees to 143 degrees.
Adopt the utility model discloses gamma ray angle correlation measuring device carries out gamma ray angle correlation measuring method to gamma radioactive sample 8, including following step:
step 1: determining the diameter size of the detector placement ring 7
Determining the diameter size of the detector layout ring 7 according to the requirement of the designed detection efficiency; the higher the requirement on the designed detection efficiency is, the smaller the diameter size of the detector layout ring 7 is;
step 2: set up gamma ray angle correlation measuring device
Step 2.1: determining the number of detectors in the gamma ray angle correlation measuring device to be built according to the precision requirement of the diagonal correlation curve; the higher the precision requirement of the general diagonal association curve is, the more the number of the detectors is;
step 2.2: determining an included angle between the central axes of the detectors according to the number of the detectors in the gamma ray angle correlation measuring device to be built determined in the step 2.1;
step 2.3: according to the diameter size of the detector arrangement ring 7 determined in the step 1 and the included angle between the central axes of the detectors determined in the step 2.2, the construction of the gamma ray angle correlation measuring device is completed;
and step 3: placing a gamma radioactive sample to be measured 8
Placing the gamma radioactive sample 8 to be measured at the circle center position of the detector arrangement ring 7 in the gamma ray angle correlation measuring device built in the step 2;
and 4, step 4: measuring angle related data to complete the measurement
And (3) simultaneously starting all detectors in the gamma ray angle correlation measurement device built in the step (2), measuring, obtaining angle correlation data of at least 10 different included angles, and finishing measurement.
In this example, gamma radioactive samples were measured60For example, the method for measuring gamma ray angle correlation includes the following steps:
step 1: determining the diameter size of the detector placement ring 7
According to the requirement of the designed detection efficiency, in the embodiment, the diameter of the detector arrangement ring 7 is determined to be 500 mm;
step 2: set up gamma ray angle correlation measuring device
Step 2.1: according to the precision requirement of the diagonal association curve, in this embodiment, it is determined that the number of detectors in the gamma ray angle association measurement device to be built is six (in other embodiments, if the precision requirement of the diagonal association curve is improved, the number of detectors may be more than six); the high-purity germanium detector in the cylindrical gamma ray detector is selected, and besides the high-purity germanium detector, a sodium iodide detector or a lanthanum bromide detector or a cadmium zinc telluride detector can be selected;
step 2.2: determining an included angle between the central axes of the detectors according to the number of the detectors in the gamma ray angle correlation measuring device to be built determined in the step 2.1; in this embodiment, an included angle between central axes of the first detector 1 and the second detector 2 is 90 degrees; an included angle between the central axes of the first detector 1 and the fourth detector 4 is 180 degrees; theta1、θ2、θ3、θ4、θ5、θ6、θ7、θ8Equal to 168 °, 123 °, 115 °, 160 °, 37 °, 102 °, 135 °, 155 °, respectively;
step 2.3: according to the diameter size of the detector arrangement ring 7 determined in the step 1 and the included angle between the central axes of the detectors determined in the step 2.2, the construction of the gamma ray angle correlation measuring device is completed;
and step 3: placing a gamma radioactive sample to be measured 8
Gamma radioactive sample to be measured60Placing Co at the circle center position of a detector arrangement ring 7 in the gamma ray angle correlation measuring device built in the step 2;
and 4, step 4: measuring angle related data to complete the measurement
And (3) simultaneously starting 6 detectors in the gamma ray angle correlation measurement device built in the step (2) for measurement, acquiring angle correlation data of at least 10 different included angles, and finishing the measurement.
The utility model discloses a gamma ray angle correlation measuring device, when having avoided adopting current gamma ray angle correlation measuring device to measure, need the mobile detector change angle problem of measuring one by one, shortened measuring time, can carry out angle correlation data measurement to the nuclide that the half-life is shorter.
Claims (6)
1. A gamma ray angle correlation measurement apparatus, characterized by:
comprises at least six detectors;
the at least six detectors are distributed along the detector distribution ring (7) in a circumferential manner, and the central axes of the detectors are positioned on the same plane and penetrate through the circle center of the detector distribution ring (7); the detector arrangement ring (7) is a virtual circle;
at least one included angle formed by the central axes of every two detectors of the at least six detectors is 90 degrees; an included angle is 180 degrees; the number of the 8 included angles is more than 90 degrees and less than 180 degrees, or more than 90 degrees and less than 180 degrees, the number of the included angles with the equivalent angle more than 90 degrees and less than 180 degrees after the included angles more than 0 degree and less than 90 degrees are converted according to the angle correlation symmetry principle is added, the sum is more than or equal to 8, and the angle values of the 8 included angles are not equal to each other.
2. A gamma ray angle correlation measurement apparatus as claimed in claim 1, wherein: the detectors are all cylindrical gamma ray detectors.
3. A gamma ray angle correlation measurement apparatus as claimed in claim 2, wherein: the cylindrical gamma ray detector is a high-purity germanium detector or a sodium iodide detector or a lanthanum bromide detector or a cadmium zinc telluride detector.
4. A gamma ray angle correlation measurement apparatus as claimed in any one of claims 1 to 3, wherein: the number of the detectors is six.
5. A gamma ray angle correlation measurement apparatus as claimed in claim 4, wherein:
defining: the six detectors are respectively a first detector (1), a second detector (2), a third detector (3), a fourth detector (4), a fifth detector (5) and a sixth detector (6) in sequence along the anticlockwise direction; and defines:
θ1the included angle between the central axes of the fifth detector (5) and the second detector (2) is formed;
θ2the included angle between the central axes of the fifth detector (5) and the third detector (3) is formed;
θ3the included angle between the central axes of the fourth detector (4) and the sixth detector (6);
θ4the included angle between the central axes of the six-number detector (6) and the three-number detector (3) is formed;
θ5the included angle between the central axes of the fifth detector (5) and the sixth detector (6);
θ6the included angle between the central axis of the fifth detector (5) and the central axis of the first detector (1) is formed;
θ7the included angle between the central axes of the first detector (1) and the third detector (3);
θ8the included angle between the central axes of the six-number detector (6) and the second-number detector (2) is formed;
an included angle between the central axes of the first detector (1) and the second detector (2) is 90 degrees; an included angle between the central axes of the first detector (1) and the fourth detector (4) is 180 degrees; theta1、θ2、θ3、θ4、θ5、θ6、θ7、θ8And after the included angles larger than 0 degree and smaller than 90 degrees are converted according to the angle correlation symmetry principle, the equivalent angle is larger than 90 degrees and smaller than 180 degrees, the rest included angles are larger than 90 degrees and smaller than 180 degrees, and the angle values of 8 included angles are not equal to each other.
6. A gamma ray angle correlation measurement apparatus as claimed in claim 5, wherein:
the diameter of the detector arranging ring (7) is 500 mm;
theta is described1、θ2、θ3、θ4、θ5、θ6、θ7、θ8Equal to 168 °, 123 °, 115 °, 160 °, 37 °, 102 °, 135 °, 155 °, respectively.
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