CN211669375U - Glove box type gamma energy spectrometer measuring device - Google Patents
Glove box type gamma energy spectrometer measuring device Download PDFInfo
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- CN211669375U CN211669375U CN202020071442.6U CN202020071442U CN211669375U CN 211669375 U CN211669375 U CN 211669375U CN 202020071442 U CN202020071442 U CN 202020071442U CN 211669375 U CN211669375 U CN 211669375U
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Abstract
The utility model provides a glove box formula gamma energy spectrometer measuring device, it includes: a gamma ray transmission window is arranged on a side plate of the glove box; the lead measuring chamber is positioned in the glove box, and a measuring hole is formed in the side surface of the lead measuring chamber; and the detection device is positioned outside the glove box and used for receiving gamma rays emitted by a sample to be measured in the lead measuring chamber through the gamma ray transmission window on the side plate of the glove box and the measuring hole on the side surface of the lead measuring chamber and collecting photoelectrons generated by the gamma rays. The utility model discloses place the sample that awaits measuring in the lead measuring chamber of glove box, and arrange the transmission window of the outer detection device of glove box side in and realized the quick measurement of strong radioactivity sample, can avoid detection device to be stained by the sample radioactivity that awaits measuring, easily examine maintenance again and change detection device, can also reduce the irradiation dose that operating personnel received simultaneously.
Description
Technical Field
The utility model relates to a nuclear industry measures technical field, concretely relates to glove box formula gamma (gamma) spectrometer measuring device.
Background
The gamma spectrometer is a radiometer for measuring the energy of gamma rays of radioactive substances. In the nuclear industry, gamma spectrometers are used in a very wide range of applications. For example, a gamma spectrometer is required for measurement of total gamma radioactivity or activities of different gamma nuclides for a sample in a process run of a post-processing plant. Because the samples in the process operation of the post-processing plant have the characteristics of strong radioactivity and large sample quantity, the measurement is mainly carried out by a sodium iodide (NaI) gamma spectrometer combined with a glove box and a high-purity germanium (HPGe) gamma spectrometer measuring device combined with a fume hood at present.
However, in the existing sodium iodide gamma spectrometer measuring device combined with the glove box, the lead chamber is located in the glove box, and the sample to be measured and the detector are located in one lead chamber, so that the glove box, the lead chamber and the detector are in a communicated space, although the surface of the detector crystal is wrapped by the protective layer, the sample to be measured is easily contaminated to the detector, and the detector is not favorable for maintenance.
When the conventional ventilated cabinet type HPGe gamma spectrometer measuring device is used for measuring a radioactive sample with high activity, the sample and a laboratory room are in the same operation space, so that once the sample is leaked, the risk of radioactive contamination and diffusion exists in the laboratory, and the radiation protection to operators is not facilitated; meanwhile, the sample to be detected and the detector are in the same space cavity, the detector has the risk of radioactive contamination, and the arrangement mode is also favorable for the detection and maintenance of the detector.
Therefore, it is an urgent problem to provide a glove box type γ energy spectrometer measuring device which can avoid the contamination of the detector by the sample to be measured and is convenient for the detector to be detected and maintained.
SUMMERY OF THE UTILITY MODEL
The present invention has been made to solve, at least in part, the technical problems occurring in the conventional measurement methods.
Solve the utility model discloses the technical scheme that technical problem adopted is:
the utility model provides a glove box formula gamma energy spectrometer measuring device, it includes:
a gamma ray transmission window is arranged on a side plate of the glove box;
the device comprises a lead measuring chamber, a detection device and a control device, wherein a sample to be detected capable of emitting gamma rays is placed in the lead measuring chamber, the lead measuring chamber is positioned in a glove box, and a measuring hole position is formed in the side surface of the lead measuring chamber; and the number of the first and second groups,
and the signal receiving end of the detection device corresponds to the positions of the gamma-ray transmission window on the side plate of the glove box and the measurement hole on the side surface of the lead measurement chamber, and is used for receiving gamma rays emitted by a sample to be measured in the lead measurement chamber through the gamma-ray transmission window on the side plate of the glove box and the measurement hole on the side surface of the lead measurement chamber and collecting photoelectrons generated by the gamma rays.
Optionally, the lead measurement chamber comprises:
the lead chamber comprises a lead chamber main body, wherein a lead chamber inner cavity is formed in the lead chamber main body, a sample to be detected is located in the lead chamber inner cavity, and a sample hole position corresponding to the position of the sample to be detected is arranged at the top of the lead chamber main body and used for taking and placing the sample to be detected.
Optionally, the lead measurement chamber comprises:
the lead chamber comprises a lead chamber main body, a lead chamber inner cavity and a lead chamber outer cavity, wherein the lead chamber main body is internally provided with an opening on the side surface, and the sample to be detected is positioned in the lead chamber inner cavity;
a lead chamber door positioned at a side opening of the lead chamber main body; and the number of the first and second groups,
the sliding rail is fixed on the bottom plate of the glove box, and the lead chamber door is arranged on the sliding rail and can slide back and forth along the sliding rail to realize opening and closing.
Optionally, each wall of the lead measuring chamber is a shielding wall, and the shielding wall comprises:
the steel frame is of a hollow structure and comprises an outer steel layer and an inner steel layer; and the number of the first and second groups,
and the lead bricks are sequentially arranged in the cavity between the outer steel layer and the inner steel layer.
Optionally, the lead bricks are arranged in the inner cavity of the steel frame in a staggered manner.
Optionally, the lead measurement chamber further comprises:
and the sample frame is arranged in the lead chamber inner cavity, and a sample to be detected is placed on the sample frame.
Optionally, the sample to be measured, the measurement hole position on the side of the lead measurement chamber, the gamma-ray transmission window on the side plate of the glove box and the central line of the signal receiving end of the detection device are located on the same horizontal line.
Optionally, the detection device comprises:
the detector is used for collecting photoelectrons generated by gamma rays emitted by a sample to be detected;
the photomultiplier is electrically connected with the detector and is used for converting the optical signal output by the detector into an electrical signal; and the number of the first and second groups,
and the preamplifier is electrically connected with the photomultiplier and is used for preliminarily amplifying the electric signals output by the photomultiplier.
Optionally, the detector is a sodium iodide detector; the sodium iodide detector, the photomultiplier and the preamplifier are integrated into a whole, and a lead shielding layer is wrapped outside the sodium iodide detector, the photomultiplier and the preamplifier.
Optionally, the detector is a high-purity germanium detector; the high-purity germanium detector and the cold finger thereof are integrated into a whole, and a lead shielding layer is wrapped outside the high-purity germanium detector.
Optionally, the measuring device further comprises: and the liquid nitrogen cooling tank or the electric redundant cooler is connected with the high-purity germanium detector through a cold finger and is used for cooling the germanium crystal in the high-purity germanium detector.
Optionally, the measuring device further comprises:
the digital multichannel analyzer is electrically connected with the detection device and is used for amplifying and shaping the electric signals output by the detection device and continuously and non-overlapping multi-channel counting voltage pulse signals with different amplitudes in the electric signals subjected to amplification and shaping;
and the instrument control system is electrically connected with the digital multi-channel analyzer and is used for processing each counting result output by the digital multi-channel analyzer to obtain a whole energy spectrum curve and analyzing and processing the energy spectrum curve to obtain the gamma radioactivity of the sample to be detected.
Optionally, the gamma-ray transmission window is made of polyethylene or carbon fiber; the sample to be detected is at least one of a radioactive sample, a toxic sample and a volatile sample.
Has the advantages that:
among the suitcase formula gamma energy spectrometer measuring device, place the sample that awaits measuring in the lead measuring chamber of glove box, and arrange the outer detection device of glove box in and realized the quick measurement of strong radioactivity sample through the transmission window of glove box side, can avoid detection device to be stained by the sample radioactivity that awaits measuring, easily examine maintenance again and change detection device, can also reduce the irradiation dose that operating personnel received simultaneously.
Drawings
Fig. 1 is a schematic front view of a glove box type gamma energy spectrometer measuring device provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic top view of a lead measuring chamber according to an embodiment of the present invention.
In the figure: 1-a lead chamber body; 2-lead chamber door; 3-an outer steel layer; 4-lead chamber body shielding wall; 5-lead chamber door slide rail; 6-lead chamber door shield layer; 7-lead chamber inner cavity; 8-inner steel layer; 9-a detector; 10-a preamplifier; 11-lead shielding layer; 12-glove box; 13-a sample holder; 14-measurement site on sample holder; a 15-gamma ray transmissive window; 16-lead bricks; 17-sample well site.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and examples.
In the nuclear industry field, there is a large amount of samples that need carry out the measurement to the gamma radioactivity activity among middle, high radioactivity solution sample, for this reason, the embodiment of the utility model provides a glove box formula gamma (gamma) energy spectrometer measuring device. As shown in fig. 1 to 3, the measuring apparatus includes: a glove box 12, a lead measuring chamber and a probe.
Wherein, a gamma ray transmission window 15 is arranged on a side plate of the glove box 12; the gamma ray transmission window 15 can be made of polyethylene or carbon fiber; the gamma ray transmission window 15 may be circular, and the circular transmission window is made of polyethylene or carbon fiber with a certain thickness, replaces an original stainless steel plate at a corresponding position of the glove box, and is connected with a side plate of the glove box in a sealing manner. Of course, the material of the gamma ray transmission window 15 may be other materials that can replace polyethylene or carbon fiber, and the material can be used as a material that can not only realize the transmission of gamma rays, but also can be used as a glove box side plate shield.
A sample to be detected capable of emitting gamma rays is placed in the lead measuring chamber, and the sample to be detected can be at least one of a radioactive sample, a toxic sample and a volatile sample; the lead measuring chamber is located in the glove box 12 and a measuring hole is formed in the side face of the lead measuring chamber.
The detection device is positioned outside the glove box 12, and a signal receiving end of the detection device corresponds to positions of a gamma-ray transmission window 15 on a side plate of the glove box and a measurement hole position on the side surface of the lead measurement chamber (the gamma-ray transmission window 15 is arranged between the lead measurement chamber and the detection device), and is used for receiving gamma rays emitted by a sample to be measured in the lead measurement chamber through the gamma-ray transmission window 15 on the side plate of the glove box and the measurement hole position on the side surface of the lead measurement chamber and collecting photoelectrons generated by the gamma rays.
In this embodiment, the sample to be detected is placed in the lead measuring chamber in the glove box, and the detection device arranged outside the glove box realizes the rapid measurement of the strong radioactive sample through the transmission window on the side surface of the glove box, so that the detection device can be prevented from being contaminated by the radioactivity of the sample to be detected, the detection device is easy to maintain and replace, and the irradiation dose applied to an operator can be reduced.
In one embodiment, the lead measurement chamber comprises: a lead chamber body 1. A lead chamber inner cavity 7 is formed in the lead chamber main body 1, a sample to be detected is located in the lead chamber inner cavity 7, and a sample hole position 17 corresponding to the position of the sample to be detected is arranged at the top of the lead chamber main body 1 and used for taking and placing the sample to be detected.
The sample hole position 17 corresponds to the position of a sample to be detected in the lead chamber inner cavity 7, and the sample to be detected also corresponds to the positions of a measurement hole position on the side surface of the lead measurement chamber, a gamma-ray transmission window 15 on a side plate of the glove box and a signal receiving end of the detection device; optionally, the sample well site 17 may be located on the central axis at the top of the lead measurement chamber and at a predetermined distance from the detection device. The number of sample wells 17 can be two, and of course, one skilled in the art can set a greater or lesser number of sample wells according to the actual situation.
In addition, the measuring hole site on the side surface of the lead measuring chamber, the sample hole site 17 on the top of the lead measuring chamber and the gamma-ray transmission window 15 on the side plate of the glove box can all adopt a circular shape, and the diameters of the measuring hole site, the sample hole site and the gamma-ray transmission window are preset aperture values; moreover, the distance between the detection device and the detection device is a preset value; the distance between the measuring hole position and the bottom surface of the lead measuring chamber, the distance between the gamma-ray transmission window and the bottom plate of the glove box and the erection height of the detection device are preset height values.
In another embodiment, a lead measurement cell comprises: lead chamber main part 1, lead chamber door 2 and lead chamber door slide rail 5.
Wherein, lead chamber inner chamber 7 and side opening are formed in the lead chamber main part 1, and the sample to be measured is located in the lead chamber inner chamber 7. The lead chamber door 2 is located at a side opening of the lead chamber main body 1. Lead chamber door slide rail 5 is fixed on the bottom plate of glove box 12, and lead chamber door 2 sets up on slide rail 5, and can follow slide rail 5 and make a round trip to slide in order to realize opening and shutting. In other words, the lead chamber door 2 is pulled left and right along the sliding rail 5 to open and close the lead measuring chamber, and the lead chamber door 2 can be a sliding rail type sliding door.
The two embodiments described above may be used alternatively or simultaneously. In other words, the sample hole 17 corresponding to the position of the sample to be measured can be arranged at the top of the lead chamber main body 1, so as to realize the sample taking and placing from the top; a lead chamber door 2 and a slide rail 5 thereof can also be arranged on the side surface of the lead chamber main body 1 to realize the taking and placing of samples from the side surface; and a sample hole 17 can be arranged at the top of the lead chamber main body 1, and a lead chamber door 2 and a slide rail 5 thereof are arranged on the side surface of the lead chamber main body 1, so that a sample can be taken and placed from at least one of the top and the side surface as required.
In some embodiments, the lead measurement chamber is a rectangular parallelepiped structure with long sides and wide sides resting on the floor of the glove box 12. Of course, the lead measuring chamber may take other shapes as the case may be.
In some embodiments, shielding walls are used for each wall of the lead measurement chamber.
In the embodiment that lead chamber main part 1 only the top has set up sample hole site 17 and the side does not set up lead chamber door 2, cuboid lead chamber main part 1 includes roof, diapire and four lateral walls, and wherein sample hole site 17 sets up in the roof, measures the hole site and sets up in certain lateral wall, and these six walls enclose into lead chamber inner chamber 7, and these six walls all adopt the shielding wall (lead chamber main part shielding wall 4 promptly).
In the embodiment that lead chamber door 2 has been set up to lead chamber main part 1 side, cuboid form lead chamber main part 1 one side opening, including roof, diapire and three lateral wall, wherein measure the hole site and set up in certain lateral wall, these five walls and lead chamber door 2 enclose into lead chamber inner chamber 7 together, and all adopt the shielding wall.
As shown in fig. 1 to 3, the shielding wall includes: steel frame and lead bricks 16.
Wherein, the steelframe adopts hollow structure, can adopt the bolt fastening on the bottom plate of glove box 12. The steel frame comprises an outer steel layer 3 and an inner steel layer 8; the lead bricks 16 are sequentially arranged in the cavity between the outer steel layer 3 and the inner steel layer 8, and the lead bricks can be of a cuboid structure, namely cuboid lead bricks.
In other words, the shielding wall adopts a three-layer structure, the outer steel layer, the lead bricks and the inner steel layer are sequentially arranged from outside to inside, the inner steel layer and the outer steel layer form a shell, and the lead bricks are filled in the shell.
Further, the lead bricks 16 are arranged in the inner cavity of the steel frame in a staggered mode by adopting an inner layer and an outer layer. The inner layer lead brick and the outer layer lead brick are arranged in a staggered mode, so that the space around the sample bottle except for the measurement hole position can be completely shielded, and gamma rays cannot leak out from a lead transfer gap.
As shown in fig. 1, the lead measuring chamber further includes: and the sample frame 13 is arranged in the lead chamber inner cavity 7, and a sample to be tested is placed on the sample frame 13. The sample holder 13 is provided with a plurality of measuring positions. The sample holder 13 is matched with a sample hole 17 at the top of the lead measuring chamber, so that a sample can be quickly placed for measurement without opening the lead chamber door 2.
In this embodiment, by placing the sample holder 13 in the lead chamber inner cavity 7, a plurality of samples can be measured simultaneously, and the distance between the sample and the detection device can be changed according to the different placing positions of the samples, so as to measure samples with different radioactivity intensities.
In some embodiments, the sample to be measured on the sample holder, the measurement hole on the side of the lead measurement chamber, the gamma-ray transmission window on the side plate of the glove box, and the center line of the signal receiving end of the detection device are located on the same horizontal line, and the three components need to be aligned to ensure the best efficiency of the detection device for measuring the sample.
As shown in fig. 1, the detecting device includes: a detector 9, a photomultiplier tube and a preamplifier 10.
The detector 9 is used for collecting photoelectrons generated by gamma rays emitted by a sample to be detected. The photomultiplier is electrically connected to the detector 9 for converting the optical signal output from the detector 9 into an electrical signal. The preamplifier 10 is electrically connected with the photomultiplier and is used for primarily amplifying the electric signal output by the photomultiplier.
In some embodiments, the detector 9 is a scintillation detector or a semiconductor detector.
Specifically, the detector 9 may employ a sodium iodide (NaI) detector or a high purity germanium (HPGe) detector.
The sodium iodide detector is a scintillation detector with a sodium iodide crystal as a substrate; the high-purity germanium detector is a semiconductor detector taking high-purity germanium crystals as a substrate. Both have the advantages of high sensitivity, large counting capacity and the like.
When the detector 9 adopts a sodium iodide (NaI) detector, further, the sodium iodide (NaI) detector, the photomultiplier and the preamplifier 10 are integrated into a whole, and the lead shielding layer 11 is externally wrapped.
When the detector 9 is a high-purity germanium (HPGe) detector, further, the high-purity germanium (HPGe) detector is integrated with a cold finger thereof, and the lead shielding layer 11 is wrapped outside. Still further, the measuring apparatus further includes: and the liquid nitrogen cooling tank or the electric redundant cooler is connected with the high-purity germanium detector through a cold finger and is used for cooling the germanium crystal in the high-purity germanium detector.
In some embodiments, the measurement device further comprises: a digital multi-channel analyzer and an instrument control system (i.e., PC side).
The digital multi-channel analyzer is electrically connected with the detection device, and particularly, a signal output end of the detection device is connected to a signal input end of the digital multi-channel analyzer. The digital multichannel analyzer integrates two functions of a main amplifier and a multichannel analyzer, wherein the main amplifier is used for further amplifying and shaping the electric signal output by the preamplifier; the multichannel analyzer can continuously count voltage pulse signals with different amplitudes in the electric signals amplified and shaped by the main amplifier in a non-overlapping way.
The instrument control system is electrically connected with the digital multi-channel analyzer, and particularly, a digital signal output end of the digital multi-channel analyzer is connected to a digital signal input end of the instrument control system. The instrument control system is used for processing each counting result output by the digital multi-channel analyzer to obtain a whole energy spectrum curve, and analyzing and processing the energy spectrum curve to obtain the gamma radioactivity of the sample to be detected. Specifically, the instrument control system is internally provided with spectrum acquisition and analysis software and spectrum data processing software, wherein the spectrum acquisition and analysis software can process each counting result output by the digital multi-channel analyzer to obtain a whole energy spectrum curve; the spectrum data processing software comprises a basic spectrum software and a gamma spectrum analysis software, wherein the basic spectrum software has the functions of spectrum acquisition, display, storage and basic processing; the gamma spectrum analysis software has complete spectrum analysis processing functions of peak searching, peak area calculation, background deduction, efficiency correction, weighted average activity calculation and the like, so that the gamma radioactivity of the sample to be detected is obtained.
In this embodiment, the instrument control system (PC end) may be installed in an area which is far away from the strong radiation environment where the glove box is located and is convenient to control, so as to meet the requirement of a worker for performing remote operation. The measuring device outside the glove box can be maintained at any time, so that the equipment is convenient to inspect and maintain, and the irradiated dose of workers is reduced.
The application process of the measuring device is as follows: the initial state, the plumbous measuring chamber is in closed state, puts into plumbous chamber inner chamber with the sample that awaits measuring according to two kinds of modes and measures: one is that the sample is directly vertically placed into a sample frame in the inner cavity of the lead chamber from a sample hole position at the top of the lead measuring chamber; one is to open a sliding door (chamber door) of the lead measuring chamber and place the sample in a sample holder. Starting an instrument control system, starting to collect the gamma-ray energy spectrum peak, and calculating by spectrum resolving software according to the area of the spectrum peak to obtain the gamma radioactivity in the sample. And after the sample measurement is finished, taking out the sample from a sample hole position at the top of the lead measuring chamber, or opening a lead chamber door to take out the sample.
It can be seen that the glove box type gamma energy spectrometer measuring device has the following advantages:
1) the sample to be measured can be quickly placed on the sample rack 13 in the lead chamber inner cavity 7 through the sample hole 17 at the top of the lead measuring chamber or the lead chamber door 2 to measure the activity of the sample, so that the analysis and measurement speed of a large number of samples is improved, and the contact time of an operator to the radioactive sample and the radiation dose received by the operator are reduced;
2) the lead measuring chamber is built by a steel frame and a lead brick, so that the lead chamber is convenient to mount, dismount and internally inspect and maintain;
3) the detector and related electronic components are located outside the glove box, so that contamination of radioactive samples to the detector is avoided, and the detector and other key components can be conveniently inspected and maintained.
To sum up, the utility model provides a glove box formula gamma energy spectrometer measuring device can realize the quick transmission and the measurement of the sample that awaits measuring in the glove box, and it is effectual to have radioactive sample shielding, and the detector can not stained by the sample radioactivity that awaits measuring, easily examines maintenance and change, and operation safety to and the simple reliable grade advantage of action can satisfy the quick measurement needs of a large amount of samples.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (13)
1. A glove box gamma spectrometer measuring device, comprising:
a gamma ray transmission window is arranged on a side plate of the glove box;
the device comprises a lead measuring chamber, a detection device and a control device, wherein a sample to be detected capable of emitting gamma rays is placed in the lead measuring chamber, the lead measuring chamber is positioned in a glove box, and a measuring hole position is formed in the side surface of the lead measuring chamber; and the number of the first and second groups,
and the signal receiving end of the detection device corresponds to the positions of the gamma-ray transmission window on the side plate of the glove box and the measurement hole on the side surface of the lead measurement chamber, and is used for receiving gamma rays emitted by a sample to be measured in the lead measurement chamber through the gamma-ray transmission window on the side plate of the glove box and the measurement hole on the side surface of the lead measurement chamber and collecting photoelectrons generated by the gamma rays.
2. A measuring device as claimed in claim 1, wherein the lead measuring chamber comprises:
the lead chamber comprises a lead chamber main body, wherein a lead chamber inner cavity is formed in the lead chamber main body, a sample to be detected is located in the lead chamber inner cavity, and a sample hole position corresponding to the position of the sample to be detected is arranged at the top of the lead chamber main body and used for taking and placing the sample to be detected.
3. A measuring device as claimed in claim 1, wherein the lead measuring chamber comprises:
the lead chamber comprises a lead chamber main body, a lead chamber inner cavity and a lead chamber outer cavity, wherein the lead chamber main body is internally provided with an opening on the side surface, and the sample to be detected is positioned in the lead chamber inner cavity;
a lead chamber door positioned at a side opening of the lead chamber main body; and the number of the first and second groups,
the sliding rail is fixed on the bottom plate of the glove box, and the lead chamber door is arranged on the sliding rail and can slide back and forth along the sliding rail to realize opening and closing.
4. A measuring apparatus as claimed in claim 2 or 3, wherein each wall of the lead measuring chamber is a shielding wall comprising:
the steel frame is of a hollow structure and comprises an outer steel layer and an inner steel layer; and the number of the first and second groups,
and the lead bricks are sequentially arranged in the cavity between the outer steel layer and the inner steel layer.
5. The measuring device of claim 4, wherein the lead bricks are arranged in two layers, namely an inner layer and an outer layer, and are arranged in the inner cavity of the steel frame in a staggered mode.
6. A measuring device according to claim 2 or 3, wherein the lead measuring chamber further comprises:
and the sample frame is arranged in the lead chamber inner cavity, and a sample to be detected is placed on the sample frame.
7. The measuring device according to claim 1, wherein the sample to be measured, the measuring hole on the side of the lead measuring chamber, the gamma-ray transmission window on the side plate of the glove box and the central line of the signal receiving end of the detecting device are located on the same horizontal line.
8. The measurement device of claim 1, wherein the detection device comprises:
the detector is used for collecting photoelectrons generated by gamma rays emitted by a sample to be detected;
the photomultiplier is electrically connected with the detector and is used for converting the optical signal output by the detector into an electrical signal; and the number of the first and second groups,
and the preamplifier is electrically connected with the photomultiplier and is used for preliminarily amplifying the electric signals output by the photomultiplier.
9. The measuring device of claim 8, wherein the detector is a sodium iodide detector; the sodium iodide detector, the photomultiplier and the preamplifier are integrated into a whole, and a lead shielding layer is wrapped outside the sodium iodide detector, the photomultiplier and the preamplifier.
10. The measuring device of claim 8, wherein the detector is a high purity germanium detector; the high-purity germanium detector and the cold finger thereof are integrated into a whole, and a lead shielding layer is wrapped outside the high-purity germanium detector.
11. The measurement device of claim 10, further comprising: and the liquid nitrogen cooling tank or the electric redundant cooler is connected with the high-purity germanium detector through a cold finger and is used for cooling the germanium crystal in the high-purity germanium detector.
12. The measurement device of claim 1, further comprising:
the digital multichannel analyzer is electrically connected with the detection device and is used for amplifying and shaping the electric signals output by the detection device and continuously and non-overlapping multi-channel counting voltage pulse signals with different amplitudes in the electric signals subjected to amplification and shaping;
and the instrument control system is electrically connected with the digital multi-channel analyzer and is used for processing each counting result output by the digital multi-channel analyzer to obtain a whole energy spectrum curve and analyzing and processing the energy spectrum curve to obtain the gamma radioactivity of the sample to be detected.
13. The measurement device according to claim 1, wherein the gamma-ray transmissive window is made of polyethylene or carbon fiber; the sample to be detected is at least one of a radioactive sample, a toxic sample and a volatile sample.
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| CN202020071442.6U CN211669375U (en) | 2020-01-14 | 2020-01-14 | Glove box type gamma energy spectrometer measuring device |
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| CN202020071442.6U CN211669375U (en) | 2020-01-14 | 2020-01-14 | Glove box type gamma energy spectrometer measuring device |
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