CN110586518B - Full-bag type grain radioactivity detection device - Google Patents

Abstract

The invention relates to a full-bag type grain radioactivity detection device, which at least comprises a second detection mechanism which is positioned at the upstream of a first detection mechanism and is provided with a containing cavity capable of containing at least two bags of bagged grains, wherein the full-bag type grain radioactivity detection device is configured to execute radioactivity detection according to the following modes: under the condition that the conveying mechanism rotates to enable first bagged grain to enter the accommodating cavity and second bagged grain in the accommodating cavity to be discharged out of the accommodating cavity, determining the change trend of the total amount of the radiated energy in the accommodating cavity; in case of an increasing total amount of radiated energy, the conveying mechanism is configured to rotate at a first rotation speed, so that the first detecting mechanism can perform data acquisition on the first bagged grain entering the accommodating cavity for a first set time, and the data analyzing mechanism performs radiation detection on the first bagged grain in a manner of performing a first operation.

Description

Full-bag type grain radioactivity detection device

Technical Field

The invention belongs to the technical field of radioactivity detection, and particularly relates to a full-bag type grain radioactivity detection device.

Background

Safety of foods is involved in various aspects, in which contamination with radioactive substances is an important problem of food safety, nuclear raw material mining areas, particularly nuclear catastrophic accident areas and their surrounding areas, often cause nuclear contamination of agricultural, aquatic and marine products for several decades due to large-scale nuclear contamination of water and soil, even nuclear contamination of seawater, and therefore, there is a need for a rapid and accurate radioactivity detection device capable of performing one hundred percent of such foods. Various food radioactive detectors are sold in markets at home and abroad, small-sized sodium iodide (thallium) (NaI (Tl)) scintillators are adopted as first detectors, special sampling cups are adopted to contain rice, flour, crushed vegetables and fruits and solutions (water and milk), and the domestic food radioactive detectors are difficult to meet the radioactive detection requirements of bulk commercial foods. There are also instruments that use a plurality of sodium iodide scintillator first detectors together to perform the radioactivity detection of bulk food, but they are expensive. For example, patent document No. CN204882881U discloses a conveyor belt type food radioactivity detector, which includes an electronic and electrical part and a mechanical part, wherein the electronic and electrical part includes a plastic scintillator first detector, a signal amplifier assembly, a processor module, a data storage module, a high-voltage power supply module, an ac switching power supply, a dc switching power supply, a motor driving and controlling circuit, a microswitch for shielding door limiting and its controlling circuit, a sensor and an input/output device; the mechanical part includes: conveyer belt mechanism, shield assembly go up first detector elevating system and instrument frame. The radioactive detection device can carry out high-efficiency, accurate and different-mode radioactive detection on a large number of agricultural and sideline fisheries and marine products packaged according to specifications.

Disclosure of Invention

The word "module" as used herein describes any type of hardware, software, or combination of hardware and software that is capable of performing the functions associated with the "module".

Aiming at the defects of the prior art, the invention provides a full-bag type grain radioactivity detection device, which comprises a conveying mechanism, a first detection mechanism and a second detection mechanism, wherein the conveying mechanism can be used for placing bagged grains, so that the bagged grains can enter the detection range of the first detection mechanism positioned at the downstream of the conveying mechanism along a set direction through the conveying of the conveying mechanism; the first detection mechanism can be used for acquiring radioactive data of the bagged grain, wherein the distance between the first detection mechanism and the bagged grain detected by the first detection mechanism can be increased or decreased, so that rays emitted by the bagged grain can be captured by the first detection mechanism in a manner that the resolution of the first detection mechanism can be adjusted; the data analysis mechanism is capable of classifying the bagged grains into at least a first class of products and a second class of products based on the radioactive data and generating a control command for controlling the sorting mechanism to execute sorting operation; a sorting mechanism capable of separating the first type of products and the second type of products in a manner of executing the sorting operation in response to the control command, wherein the full-bag grain radioactivity detecting device further comprises a second detecting mechanism which is located at the upstream of the first detecting mechanism and is provided with a containing cavity capable of containing at least two bags of bagged grains, and the full-bag grain radioactivity detecting device is configured to execute radioactivity detection in a manner as follows: under the condition that the conveying mechanism rotates to enable first bagged grain to enter the accommodating cavity and second bagged grain in the accommodating cavity to be discharged out of the accommodating cavity, determining the change trend of the total amount of the radiated energy in the accommodating cavity; in case of an increasing total amount of radiated energy, the conveying mechanism is configured to rotate at a first rotation speed, so that the first detecting mechanism can perform data acquisition on the first bagged grain entering the accommodating cavity for a first set time, and the data analyzing mechanism performs radiation detection on the first bagged grain in a manner of performing a first operation.

According to a preferred embodiment, in the case that the total amount of the radiated energy is decreasing, the conveying mechanism is configured to rotate at a second rotation speed, so that the first detecting mechanism can perform data acquisition on the first bagged grain entering the containing cavity for a second set time, and the data analyzing mechanism performs radiation detection on the first bagged grain in a manner of performing a second operation, wherein: the first rotational speed is less than the second rotational speed such that the first set time is greater than the second set time.

According to a preferred embodiment, the full-bag grain radioactivity detecting device is further configured to perform radioactivity detection in the following manner: under the condition that the accommodating cavity can accommodate N bags of second bagged grains and the conveying mechanism is provided with N bags of first bagged grains, the second bagged grains are associated with the first bagged grains at an interval of N-1 bags of the first bagged grains; and under the condition that the total amount of the radiated energy in the accommodating cavity is increased and the second bagged grain is judged to belong to the second type of product, the first bagged grain associated with the second bagged grain is judged to be the second type of product by skipping the radioactivity detection, or under the condition that the total amount of the radiated energy in the accommodating cavity is decreased and the second bagged grain is judged to belong to the first type of product, the first bagged grain associated with the second bagged grain is judged to be the first type of product by skipping the radioactivity detection.

According to a preferred embodiment, the first bagged grain associated with the second bagged grain is further determined as performing said first operation in case the total amount of radiated energy in the containing cavity is increased and it is determined that the second bagged grain belongs to the first kind of product, or the first bagged grain associated with the second bagged grain is further determined as performing said first operation in case the total amount of radiated energy in the containing cavity is decreased and it is determined that the second bagged grain belongs to the second kind of product.

According to a preferred embodiment, the full-bag type grain radioactivity detecting device further comprises a turnover mechanism and a heating dryer, wherein the turnover mechanism and the heating dryer can be matched with the second detecting mechanism, and are arranged in the accommodating cavity, and the full-bag type grain radioactivity detecting device comprises: the turnover mechanism can be used for placing the bagged grains and changing the gravity center parameters of the bagged grains on the turnover mechanism in a mode of rotating relative to the conveying mechanism to change the inclination angle between the turnover mechanism and the conveying mechanism; the heating dryer can at least change the humidity parameter of the bagged grains positioned on the turnover mechanism in a way of changing the temperature of the accommodating cavity; the second detection mechanism can capture rays emitted by bagged grains positioned above the turnover mechanism in a discontinuous time and discontinuous space mode.

According to a preferred embodiment, the sorting mechanism comprises a first conveyor belt, a second conveyor belt and a sorting box with at least two storage cavities, and the sorting box can rotate around the central axis of the sorting box by a set angle to align the storage cavities with the first conveyor belt or the second conveyor belt when the bagged grain enters one of the storage cavities through the conveying of the conveying mechanism.

According to a preferred embodiment, said first conveyor belt and said second conveyor belt are arranged parallel to each other on a base on which at least one guide plate is hinged, said sorting operation being carried out according to the following steps: in the case that the bagged grain in the storage cavity is judged to belong to a first type of product, the guide plate is configured to rotate around a hinge point of the guide plate in a first direction so that the storage cavity is communicated with the first conveyor belt; in the case that the bagged grain in the storage cavity is determined to belong to the second type of product, the guide plate is configured to rotate around the hinge point of the guide plate in the second direction so that the storage cavity is communicated with the second conveyor belt.

According to a preferred embodiment, the first operation comprises at least a spectral generation process and a spectral de-generation process, and the second operation comprises at least the spectral generation process and a spectral contrast process, wherein: the first detection mechanism comprises at least a first probe, the second detection mechanism comprises at least a second probe, the data analysis mechanism comprises at least a server, wherein the server is configured to perform the energy spectrum generation process, the spectrum decomposition process and the energy spectrum comparison process; each bagged grain is provided with an electronic tag, so that the server can obtain the serial number of the bagged grain based on the electronic tag to complete the differentiation of the bagged grain.

The invention also provides a full-bag type grain radioactivity detection method, which at least comprises the following steps: the conveying mechanism is used for placing bagged grains, so that the bagged grains can enter a detection range of a first detection mechanism located at the downstream of the conveying mechanism along a set direction through the conveying of the conveying mechanism; configuring a first detection mechanism which can be used for acquiring radioactivity data of the bagged grain, wherein the distance between the first detection mechanism and the bagged grain detected by the first detection mechanism can be increased or decreased, so that rays emitted by the bagged grain can be captured by the first detection mechanism in a manner that the resolution of the first detection mechanism can be adjusted; configuring a data analysis mechanism capable of classifying the bagged grain into at least a first type of product and a second type of product based on the radioactivity data, wherein the data analysis mechanism is further capable of generating control commands for controlling a sorting mechanism to perform sorting operations; configuring a sorting mechanism capable of separating the first type of product and the second type of product in a manner that performs the sorting operation in response to the control command; a second detection mechanism which is arranged at the upstream of the first detection mechanism and is provided with a containing cavity capable of containing at least two bags of bagged grains, wherein: under the condition that the conveying mechanism rotates to enable first bagged grain to enter the accommodating cavity and second bagged grain in the accommodating cavity to be discharged out of the accommodating cavity, determining the change trend of the total amount of the radiated energy in the accommodating cavity; in case of an increasing trend of the total amount of radiated energy, the conveying mechanism is configured to rotate at a first rotation speed, so that the first detection mechanism can perform data acquisition on the first bagged grain entering the containing cavity for a first set time, and the data analysis mechanism is configured to perform radioactive detection on the first bagged grain in a manner of performing a first operation.

According to a preferred embodiment, the method for detecting radioactivity of full-bag grain further comprises the following steps: in the case that the total amount of the radiated energy is on a decreasing trend, configuring the conveying mechanism to rotate at a second rotating speed, so that the first detection mechanism can perform data acquisition on the first bagged grain entering the containing cavity for a second set time, and configuring the data analysis mechanism to perform radioactive detection on the first bagged grain in a manner of performing a second operation, wherein: the first rotational speed is less than the second rotational speed such that the first set time is greater than the second set time.

The invention has the beneficial technical effects that:

(1) the sorting machine can sort bagged grains with different quality grades through the sorting mechanism, the whole process is carried out fully automatically, and the labor intensity of operators can be effectively reduced.

(2) According to the invention, the bagged grain is subjected to pre-judgment section through the second detection mechanism so as to preliminarily determine the bagged grain of which the radioactivity anomaly belongs to a high-probability event, and then the bagged grain is subjected to detailed analysis and detection through the first detection mechanism so as to be accurately determined, so that the time required by radioactivity detection can be effectively prolonged on the basis of ensuring the judgment accuracy.

(3) Compared with the spectrum solution processing, the spectrum comparison processing requires smaller data processing amount and shorter processing time, so that the radioactivity detection speed can be increased, and the configuration requirement of the data processing on a server can be reduced.

Drawings

FIG. 1 is a schematic structural diagram of a preferred full-bag type grain radioactivity detecting device according to the present invention;

FIG. 2 is a schematic layout of the preferred conveyor mechanism, sorting mechanism, first conveyor belt and second conveyor belt of the present invention;

FIG. 3 is another schematic structural diagram of the preferred full-bag grain radioactivity detecting device of the present invention;

FIG. 4 is a schematic view illustrating the relationship between the first bagged grain and the second bagged grain according to the present invention; and

fig. 5 is a schematic view of the preferred canting mechanism of the present invention.

List of reference numerals

1: the conveying mechanism 2: first detection mechanism 3: data analysis mechanism

4: sorting mechanism 5: the storage chamber 6: roller wheel

7: second detection mechanism 8: and 9, bagged grains: electronic label

10: the first identifier 11: the second recognizer 12: base seat

13: turnover mechanism 14: heating drier

1 a: a body 1 b: rotating roller 1 c: leather belt

2 a: first detector 2 b: a bracket 2 c: telescopic rod

3 a: the server 3 b: display α: inclination angle

4 a: sorting box 4 b: first conveyor belt 4 c: second conveyor belt

4 d: guide plate 8 a: the first bagged grain 8 b: second bagged grain

7 a: second detector 7 b: and a box body 7 c: containing cavity

13 a: turning plate 13 b: supporting seat

Detailed Description

The following detailed description is made with reference to the accompanying drawings.

Example 1

As shown in fig. 1, the present invention provides a full-bag type grain radioactivity detecting device, which at least comprises a conveying mechanism 1, a first detecting mechanism 2 and a data analyzing mechanism 3. The first detection mechanism 2 is disposed above the conveying mechanism 1, and further, in the process that the conveying mechanism 1 conveys the bagged grain 8 from the first end to the second end of the first detection mechanism 2, the first detection mechanism 2 can scan the bagged grain to obtain radioactive data such as an energy range of a gamma-ray radionuclide or a total amount of rays of all energy sections emitted by a reflective nuclide. The data analysis means 3 are able to process the data acquired by the first detection means 2 to form, for example, a gamma spectrum. For example, the data analysis mechanism 3 may include a multichannel analyzer to form an energy spectrum. Based on the energy spectrum, the energy peak value corresponding to the spectrum peak can be determined. The data analysis mechanism 3 is also configured to perform a spectrum-resolving process on the energy spectrum using a spectrum-resolving method such as a stripping method, an inverse matrix method, and a least square method to obtain the contents of the various nuclides from the spectral peaks. Specifically, the energy spectrum is analyzed to subtract the influence of the background spectrum, then preprocessing such as removing abnormal values of the signal spectrum, spectrum smoothing filtering, spectrum drift correction, peak searching, spectrum stabilization and the like is performed on the energy spectrum, and finally the influence of Compton scattering of various nuclides on the spectrum data is eliminated through spectrum decomposition processing on the energy spectrum.

Preferably, the conveying mechanism 1 includes at least a body 1a, a rotating roller 1b, and a belt 1 c. A plurality of turning rollers 1b are provided on the body 1a in parallel with each other, and each turning roller 1b can rotate about its own central axis. The belt 1c twines on live-rollers 1b for when live-rollers 1b rotated, belt 1c can rotate in step, and then realizes the transmission of the grain in bags on the belt, can carry the grain in bags to the detection range of first detection mechanism 2 through conveying mechanism 1. Preferably, the body 1a can be further provided with at least one driving motor, and the driving motor is connected to at least one rotating roller, so that the belt and the remaining rotating rollers can synchronously rotate under the driving of the driving motor.

Preferably, the first detection means 2 comprise at least one first probe 2 a. The first detector may be a NaI first detector or a scintillator first detector. Gamma rays generated by radioactive substances such as iodine 131, cesium 134, and cesium 137 in the bagged grain placed on the belt 1c can be captured by the scintillator first detector. After the scintillator interacts with the radiation, the scintillator absorbs the energy of the radiation to ionize and excite atoms and molecules. Excited atoms or molecules emit fluorescent photons when they are de-excited. The fluorescence photons can be collected by the photocathode of the scintillator first detector to knock out the photoelectrons. The photoelectrons can be multiplied in a photomultiplier tube to produce an electrical signal on the anode load. Preferably, the first detection mechanism 2 further comprises a bracket 2b and a telescopic rod 2 c. The bracket 2b is fixedly arranged on the body 1 a. The telescopic bar 2c is provided on the bracket 2b in such a manner that the extending direction thereof is perpendicular to the belt 1 c. The first detector 2a is arranged on the telescopic rod 2c, and then the first detector 2a can be controlled to move upwards or downwards through the telescopic rod 2c to adjust the distance between the first detector and bagged grains. Can be with the distance control between the grain in bags and the first detector at minimum through telescopic link 2c, and then can improve resolution ratio.

Preferably, the data analysis means 3 comprise at least a server 3a and a display 3 b. The data analysis mechanism is capable of classifying the bagged grain into a first type of product and a second type of product based on the radioactivity data. The server 3a and the first detector 2a may be in communication connection in a wired or wireless manner, so that data collected by the first detector 2a can be transmitted to the server 3a for analysis and processing. The display 3b is connected to the server 3a, and can output a processing result of the server 3 a. The server 3a can perform a de-spectroscopy process on the generated energy spectrum to determine the amount of energy released by the radionuclide. For example, an energy calibration curve can be established to visually display the relationship between gamma ray energy and spectral line position. The lower the energy of the gamma ray is, the larger the bragg angle thereof is, so that the line position on the recording surface is farther from the center of the optical axis, and the energy of the radionuclide can be determined.

Preferably, the server 3a can also divide the bagged grain conveyed on the belt 1c into a first type of product and a second type of product. The first kind of product is qualified product, and shows that the radioactive nuclide content and radioactive emission of the bagged grains are in normal range. The second product is a non-qualified product, which indicates that the content and the radiation quantity of the radionuclide in the bagged grain exceed the set threshold. Preferably, the full-bag type grain radioactivity detecting device further comprises a sorting mechanism 4. The first type of product can be individually screened out by sorting mechanism 4 for individual storage. In particular, the data analysis mechanism is capable of generating control commands for controlling the sorting mechanism to perform sorting operations. The sorting mechanism 4 is configured to separate the first type of product from the second type of product in a manner that performs a sorting operation in response to a control command.

Preferably, the sorting mechanism 4 includes at least a sorting box 4a, a first conveyor belt 4b, a second conveyor belt 4c, and a guide plate 4d as shown in fig. 1 and 2. The sorting box 4a is provided with a plurality of storage cavities 5 for temporarily storing the bagged grains. The storage chamber 5 is provided therein with rollers 6 capable of normal rotation and reverse rotation. Preferably, the first conveyor belt 4b and the second conveyor belt 4c are arranged on the same base 12 in parallel to each other. The guide plate 4d is provided on the base 12 in an articulated manner. The sorting box 4a is arranged at the tail end of the conveying mechanism 1 to receive the bagged grain on the conveying mechanism 1. A first conveyor belt 4b and a second conveyor belt 4c are arranged adjacent to each other on one side of the sorting box 4a, wherein the first conveyor belt 4b is intended to receive products of a first type and the second conveyor belt 4c is intended to receive products of a second type. Specifically, the sort bin 4a may be defined by a cylindrical shape and be rotatable about its central axis. A plurality of storage chambers 5 are circumferentially arranged along the circumference of the sorting box 4 a. In the case where the bagged grain 8 is conveyed by the conveying mechanism 1 to enter one of the storage chambers 5, the sorting box 4a can align the storage chamber 5 with the first conveyor belt 4b or the second conveyor belt 4c in such a manner as to rotate at a set angle about its own central axis. For ease of understanding, the sorting process of the sorting mechanism 4 will be discussed in detail: as shown in figure 1, bagged grains are continuously put in from the leftmost end of the conveying mechanism 1, and the rotating roller 1b rotates clockwise to drive the bagged grains to move rightwards. When the bagged grain moves from the lower part of the first detection mechanism 2, the first detection mechanism 2 can collect the radioactive data of the bagged grain and transmit the radioactive data to the data analysis mechanism 3 for analysis and processing. The rotating roller 1b can rotate at a set speed at a constant speed, and then the bagged grain after detection is guided into one of the storage cavities 5 of the sorting box 4a from the rightmost end of the conveying mechanism 1. When the bagged grains enter the storage cavity 5, the roller 6 can rotate forwards to facilitate the entering of the bagged grains. The sorting box 4a is then rotated by a set angle to rotate the storage cavity 5 in an idle state to a position corresponding to the conveying mechanism 1, and new bagged grains on the conveying mechanism 1 can enter the idle storage cavity 5. The storage chambers 5 are distinguished by numbering. For example, when there are six storage chambers 5, the storage chambers are named as a # 1 storage chamber and a # 2 storage chamber … … 6# 896, respectively. The bagged grains can be sequentially loaded into the six storage cavities 5 according to the sequence. In the process of sequentially loading the bagged grains into the storage cavity 5, the server 3a can analyze and process the data of each bagged grain one by one to judge whether each bagged grain belongs to a first type product or a second type product. That is, the server 3a firstly processes the data of the bagged grain in the storage cavity 1# to determine the category. When the bagged grain in the No. 1 storage cavity belongs to the first type of products, the bagged grain can be conveyed to the first conveyor belt 4b after the rollers 6 in the No. 1 storage cavity are reversely rotated and the guide plates 4d rotate along the first direction to be aligned and communicated with the first conveyor belt 4 b. Subsequently, the sorting box 4a is rotated by a set angle to align the # 1 storage chamber with the conveying mechanism 1, and to align the # 2 storage chamber with the first conveyor belt 4 b. When the bagged grain in the No. 2 storage cavity belongs to a first type of product, the guide plate 4d maintains the current situation, and then the bagged grain in the No. 2 storage cavity can be transmitted to the first conveyor belt 4 b. When the bagged grain in the # 2 storage chamber belongs to the second type of product, the guide plate 4d rotates in the second direction to make the storage chamber in alignment with the second conveyor belt 4c so that the bagged grain in the # 2 storage chamber can be transferred onto the second conveyor belt 4 c. Through setting up sorting box 4a that has a plurality of storage chamber 5, can keep in grain in bags, avoided server 3a can't in time accomplish the operation of handling the result and can't drive sorting mechanism 4 and carry out the defect of in time sorting. The set angle α for each rotation of the sorting mechanism can be determined by the formula α being 360/m. m is the number of storage chambers. For example, when the number of the storage chambers is 6, the set angle per rotation is 60 °. Preferably, the first direction is a counterclockwise direction as viewed in fig. 2. The second direction is clockwise.

Example 2

This embodiment is a further improvement of embodiment 1, and repeated contents are not described again.

Preferably, as shown in fig. 3, the full-bag type grain radioactivity detecting device further comprises a second detecting mechanism 7. The second detection mechanism 7 is arranged at the upstream of the first detection mechanism 2 and is used for measuring the total amount of the radiant energy released by at least two bags of grain. Specifically, the second detection mechanism 7 includes at least a second probe 7a and a case 7 b. The box body 7b is arranged on the body 1a and defines a containing cavity 7c which can contain at least two bags of grain. After the bagged grain is placed on the belt 1c, the bagged grain firstly enters the accommodating cavity 7c through the transmission of the belt. It can be understood that the containing cavity 7c can contain more than 3 bags or even more bags of grain at the same time by enlarging the volume of the box body 7 b. A second detector 7a is provided in the case 7b, and the total amount of radiation energy in the accommodating chamber 7c can be measured by the second detector 7 a.

Preferably, the bagged grain 8 can be provided with an electronic tag 9. The first detection mechanism 2 and the second detection mechanism 3 are provided with a first identifier 10 and a second identifier 11, respectively. And then make first detection mechanism 2 and second detection mechanism 3 all can confirm the identity of the grain in bags that it detected. The full-bag type grain radioactivity detection device is configured to complete radioactivity detection on bagged grains as follows:

s1: in the case where the conveying mechanism 1 rotates so that the first bagged grain 8a on the belt 1c enters the accommodating chamber 7c and the second bagged grain 8b in the accommodating chamber 7c is discharged out of the accommodating chamber 7c, a trend of change in the total amount of the radiated energy in the accommodating chamber 7c is determined.

Specifically, as shown in fig. 3, the first bagged grain 8a is bagged grain that is not subjected to radioactive detection and is located on the left side of the second detection unit 7. When the bagged grain on the left side in the second detection mechanism 7 enters the box body 7b, the bagged grain is converted into a second bagged grain 8b, namely, the second bagged grain 8b refers to the bagged grain which is subjected to radioactive detection by the second detector 7 a. Since the respective radiant energies of each bag of bagged grain may be the same as each other, the total amount of radiant energy in the accommodating chamber 7c can show an increasing tendency or a decreasing tendency. By real-time acquisition of the second detector 7a, the server 3a is able to process the data acquired by the second detector 7a to determine the trend of the variation of the total amount of radiant energy.

S2: in case that the total amount of the radiated energy is on an increasing trend, the conveying mechanism 1 is configured to rotate at a first rotating speed, so that the first detecting mechanism 2 can perform data collection on the first bagged grain 8a entering the accommodating cavity 7c for a first set time, and the data analyzing mechanism 3 performs radioactivity detection on the first bagged grain 8a in a manner of performing a first operation, or in case that the total amount of the radiated energy is on a decreasing trend, the conveying mechanism 1 is configured to rotate at a second rotating speed, so that the first detecting mechanism 2 can perform data collection on the first bagged grain 8a entering the accommodating cavity 7c for a second set time, and the data analyzing mechanism 3 performs radioactivity detection on the first bagged grain 8a in a manner of performing a second operation.

Specifically, for the convenience of understanding, the box 7b is configured to accommodate two bags of bagged grains, and the working principle of the first detector and the server will be discussed in detail by taking three bags of bagged grains as an example. As shown in fig. 3, 1# bagged grain and 2# bagged grain are sequentially arranged in the box body 7b from right to left, and a belt 1c at the left side of the box body 7b is provided with3# bagged grains are placed. At this time, the 1# and 2# bagged grains are defined as the second bagged grain 8b, and the 3# bagged grain is defined as the first bagged grain 8 a. The second detector 7a first measures the first total amount W of the radiation energy of the 1# bagged grain and the 2# bagged grain₁. With the rotation of the belt 1c, the 1# bagged grain is gradually transferred out of the box body 7b and the 3# bagged grain gradually enters the box body 7 b. At this time, the second detector 7a can measure the second total amount W of the radiation energy of the 2# bagged grain and the 3# bagged grain₂. In a second total amount W₂Greater than the first total amount W₁The increase of the radiation energy indicates that the radioactive abnormality of the 3# bagged grain belongs to a high probability event, and further detailed analysis needs to be carried out on the 3# bagged grain for further judgment. The detailed analysis of the 3# bagged grain at least comprises the following steps: when the 3# bagged grain enters the detection range of the first detector 2a, the belt 1c rotates at a first rotation speed, so that the measurement time of the 3# bagged grain by the first detector 2a is kept to be a first set time, and the server 3a performs a first operation at least including energy spectrum generation processing and spectrum decomposition processing on data collected by the first detector 2a to obtain detailed data of the 3# bagged grain, such as specific content of radionuclide and specific numerical value of radioactivity, and further can judge whether the 3# bagged grain belongs to a second type product. In a second total amount W₂Less than the first total amount W₁It shows a decreasing trend of the radiation energy in the case 7 b. The reduction of the radioactive energy indicates that the radioactivity of the 3# bagged grain belongs to a large probability event, and further, the 3# bagged grain can be analyzed briefly to shorten the overall time of radioactivity detection. The short analysis of the 3# bagged grain at least comprises the following steps: when the 3# bagged grain enters the detection range of the first detector 2a, the belt 1c rotates at a second rotation speed, so that the measurement time of the 3# bagged grain by the first detector 2a is kept to be a second set time, and the server 3a performs a second operation at least comprising energy spectrum generation processing and energy spectrum comparison processing on the data acquired by the first detector 2a to quickly judge whether the 3# bagged grain belongs to a first type of product. For example, the server 3a stores therein radioactive dataStandard spectrum of the target bagged grain. The energy spectrum comparison processing refers to comparing and analyzing the energy spectrum of the 3# bagged grain generated by the server 3a with the standard energy spectrum to determine the coincidence similarity of the two. And when the coincidence similarity of the grain and the grain is greater than a set threshold value, judging that the 3# bagged grain belongs to a first type product, otherwise, judging that the 3# bagged grain belongs to a second type product. Preferably, the first rotational speed is less than the second rotational speed such that the first set time is greater than the second set time. Because first settlement time is greater than the second settlement time, can be so that the radioactivity data that first detector 2a gathered are more accurate and abundant, can be favorable to the server to carry out the accurate detection and the judgement of radioactivity. Through the mode, at least the following technical effects can be achieved: if the environmental factors of the production area reach the standard, the phenomenon that a large amount of radioactivity exceeds the standard is not caused, so that the majority of normal grains reaching the standard in radioactivity in the same production area and the same batch of bagged grains is occupied, and at the moment, if each bag of bagged grains is subjected to careful analysis and detection, the detection time is long and the data processing capacity is large. Therefore, the bagged grain is pre-judged by the second detection mechanism 7 to preliminarily determine the bagged grain with radioactive abnormality belonging to a high-probability event, and then the bagged grain is analyzed and detected in detail by the first detection mechanism 2 to be accurately determined, so that the time required by radioactive detection can be effectively prolonged on the basis of ensuring the judgment accuracy. Compared with the spectrum solution processing, the spectrum comparison processing requires smaller data processing amount and shorter processing time, so that the radioactivity detection speed can be increased, and the configuration requirement of the data processing on the server can be reduced.

Example 3

This embodiment is a further improvement of the foregoing embodiment, and repeated contents are not described again.

Preferably, the full-bag type grain radioactivity detecting device is configured to complete the radioactivity detection of the bagged grain according to the following modes:

s1: under the condition that the accommodating cavity 7c can accommodate N bags of second bagged grains 8b and N bags of first bagged grains 8a are arranged on the conveying mechanism 1, the second bagged grains 8b are associated with the first bagged grains 8a at intervals of N-1 bags of the first bagged grains 8 a.

Specifically, each bag of grain can be provided with an electronic tag 9, the first detector 2a is provided with a first identifier 10, and the second detector 7a is provided with a second identifier 11. When the bagged grain enters the box body 7b, the second identifier 11 can scan the electronic tag 9 and determine the serial number of the bagged grain. Each bag of grain in bags is provided with an independent serial number, and the serial number of the grain in bags can be identified and confirmed through the electronic tag.

Preferably, for the convenience of understanding, the box 7b is configured to accommodate two bags of bagged grains, and the detailed discussion of the relationship between the second bagged grains 8b and the first bagged grains 8a will be given by taking four bags of bagged grains as an example. As shown in fig. 4, two bags of the grain in the box 7b are defined as a second bag 8b, and the numbers of the second bag 8b are respectively set to "a 1" and "a 2" in the order from right to left. The two-grain bags on the left side of the box 7b are defined as a first bagged grain 8a, and the first bagged grain 8a is numbered as "A3" and "a 4" in order from right to left, respectively. The box 7b can accommodate two bags of grain, and n is 2. At this time, the second bagged grain 8b numbered "a 1" and the first bagged grain 8a numbered "A3" are associated with each other, and the second bagged grain numbered "a 2" and the first bagged grain 8a numbered "a 4" are associated with each other.

S2: in the case where the total amount of the radiated energy in the accommodating chamber 7c is increased and it is determined that the second bagged grain 8b belongs to the second type of product, the first bagged grain 8a associated with the second bagged grain 8b is determined as the second type of product by skipping the radioactivity detection, or in the case where the total amount of the radiated energy in the box 7a is decreased and it is determined that the second bagged grain 8b belongs to the first type of product, the first bagged grain 8a associated with the second bagged grain 8b is determined as the first type of product by skipping the radioactivity detection.

Specifically, as shown in fig. 4, the belt 1c rotates to allow the second bagged grain 8b numbered "a 1" to be discharged out of the box 7a, and allow the first bagged grain 8a numbered "A3" to enter the box 7 a. An increase in the total amount of radiated energy in the bin 7a indicates that the radioactive abnormality of the first bagged grain 8a, numbered "a 3", is of a high probability event. At this time, the belt 1c is rotated at a smaller first rotation speed, and the server 3a performs a first operation to perform a detailed analysis of the second bagged grain 8b numbered "a 1" so that it can be determined whether it belongs to the first or second type of product. When the second bagged grain 8b numbered "a 1" belongs to the second type of product, the first detector 2a does not collect the radioactive data of the first bagged grain 8a numbered "A3" and the server directly judges the first bagged grain 8a numbered "A3" as the second type of product. That is, an increase in the total amount of radiant energy in the box 7a indicates that the amount of radiation of the first bagged grain 8a numbered "A3" is greater than the amount of radiation of the second bagged grain 8b numbered "a 1", and if the amount of radiation of the second bagged grain 8b numbered "a 1" is a radioactivity abnormal product, the first bagged grain 8a numbered "A3" is also a radioactivity abnormal product without fail, so that the server 3a can omit processes such as energy spectrum generation and resolution to save radioactivity detection time.

Preferably, referring again to fig. 4, the belt 1c is rotated to allow the second bagged grain 8b, numbered "a 1", to exit the bin 7a and the first bagged grain 8a, numbered "A3", to enter the bin 7 a. A decrease in the total amount of radiated energy in the bin 7a indicates that the radioactive abnormality of the second bagged grain 8b, numbered "a 1", is of a high probability event. At this time, the belt 1c is rotated at a smaller first rotation speed, and the server 3a performs a first operation to perform a detailed analysis of the second bagged grain 8b numbered "a 1" so that it can be determined whether it belongs to the first or second type of product. In case that the second bagged grain 8b numbered as "a 1" is judged as the first type product, the first detector 2a does not collect the radioactive data of the first bagged grain 8a numbered as "A3" and the server 3a directly judges the first bagged grain 8a numbered as "A3" as the first type product. That is, a decrease in the total amount of radiant energy in the box 7a indicates that the amount of radiation of the first bagged grain 8a numbered "A3" is smaller than the amount of radiation of the second bagged grain 8b numbered "a 1", and if the amount of radiation of the second bagged grain 8b numbered "a 1" belongs to a qualified product that meets the radioactivity standard, the first bagged grain 8a numbered "A3" also necessarily belongs to a qualified product that meets the radioactivity standard, so that the server 3a can omit processes such as energy spectrum generation, spectrum decomposition, and the like to save the radioactivity detection time.

S3: the first bagged grain 8a associated with the second bagged grain 8b is further determined in such a way as to perform the first operation in case the total amount of radiated energy in the accommodating chamber 7c increases and it is determined that the second bagged grain 8b belongs to the first kind of product, or the first bagged grain 8a associated with the second bagged grain 8b is further determined in such a way as to perform the first operation in case the total amount of radiated energy in the box 7a decreases and it is determined that the second bagged grain 8b belongs to the second kind of product.

Specifically, as shown in fig. 4, the belt 1c rotates to allow the second bagged grain 8b numbered "a 1" to be discharged out of the box 7a, and allow the first bagged grain 8a numbered "A3" to enter the box 7 a. An increase in the total amount of radiated energy in the bin 7a indicates that the radioactive abnormality of the first bagged grain 8a, numbered "a 3", is of a high probability event. At this time, the belt 1c is rotated at a smaller first rotation speed, and the server 3a performs a first operation to perform a detailed analysis of the second bagged grain 8b numbered "a 1" so that it can be determined whether it belongs to the first or second type of product. When the second bagged grain 8b numbered as "a 1" belongs to the first type of product, the belt 1c rotates at the first rotation speed to make the contact time between the first bagged grain 8a numbered as "A3" and the first detector 2a be the first set time, so that the first detector 2a can collect more comprehensive and sufficient radioactive data for the server 3a to perform the second operation, thereby obtaining a more accurate determination result. That is, if the total amount of the radiant energy in the box 7a increases, it indicates that the radiant quantity of the first bagged grain 8a numbered as "A3" is greater than the radiant quantity of the second bagged grain 8b numbered as "a 1", and if the radiant quantity of the second bagged grain 8b numbered as "a 1" is a normal product with a standard radioactivity, the first bagged grain 8a numbered as "A3" also has a certain probability of belonging to a product with a radioactivity abnormality, and further, the server 3a and the first detector 2a need to perform detailed analysis to further determine the product.

Preferably, referring again to fig. 4, the belt 1c is rotated to allow the second bagged grain 8b, numbered "a 1", to exit the bin 7a and the first bagged grain 8a, numbered "A3", to enter the bin 7 a. A decrease in the total amount of radiated energy in the bin 7a indicates that the radioactive abnormality of the second bagged grain 8b, numbered "a 1", is of a high probability event. At this time, the belt 1c is rotated at a smaller first rotation speed, and the server 3a performs a first operation to perform a detailed analysis of the second bagged grain 8b numbered "a 1" so that it can be determined whether it belongs to the first or second type of product. Under the condition that the second bagged grain 8b with the number of "a 1" is judged to be the second type of product, the belt 1c rotates at the first rotating speed to enable the contact time between the first bagged grain 8a with the number of "A3" and the first detector 2a to be the first set time, and then the first detector 2a can collect more comprehensive and sufficient radioactive data to enable the server 3a to execute the second operation, so that a more accurate judgment result can be obtained. That is, if the total amount of the radiant energy in the box 7a is reduced, it indicates that the radiant quantity of the first bagged grain 8a numbered "A3" is less than that of the second bagged grain 8b numbered "a 1", and if the radiant quantity of the second bagged grain 8b numbered "a 1" is a radioactivity abnormal product, the first bagged grain 8a numbered "A3" also has a certain probability of belonging to a normal product with a standard radioactivity, and further, the server 3a and the first detector 2a need to perform detailed analysis to further determine the product. By establishing the incidence relation between the first bagged grain and the second bagged grain, detailed analysis and detection of each bag of bagged grain can be avoided, and the overall speed of radioactive detection can be increased to a greater extent.

Example 4

This embodiment is a further improvement of the foregoing embodiment, and repeated contents are not described again.

Preferably, as shown in fig. 5, the full-bag type grain radioactivity detecting device of the present invention further comprises a turnover mechanism 13. The turning mechanism 13 is used in cooperation with the second detection mechanism 7. Under the condition that the bagged grain 8 is placed on the turnover mechanism 13, the turnover mechanism 13 can change the inclination angle alpha between the turnover mechanism 13 and the conveying mechanism 1, so that radioactive rays generated by the bagged grain 8 can be captured by the second detection mechanism 7 in at least one detection direction. Specifically, the turnover mechanism 13 at least includes a turnover plate 13a and a support base 13 b. The support base 13b can be provided at the body 1 a. The flipping panel 13a can be hinged to the support base 13b such that the flipping panel 13a can rotate around the support base 13 b. For example, a rotating shaft is provided on the supporting base 13b, the flap plate 13a is connected to the rotating shaft, and a driving device such as a motor is provided on the supporting base 13b, so that the flap plate can be driven to rotate counterclockwise or clockwise by the driving of the motor.

Preferably, when the turning plate 13a is in a state of being substantially parallel to the conveying mechanism 1, the bagged grain 8 can be placed on the turning plate 13a based on the conveyance by the conveying mechanism 1. The turnover plate 13a can rotate around the support base 13b to increase the inclination angle α, so that the bagged grain can present different detection postures, wherein when the inclination angle α of the turnover plate 13a is larger than a set threshold value of 90 degrees, for example, the bagged grain can fall off from the turnover plate 13a and continue to be conveyed to the downstream by the conveying mechanism 1.

Preferably, again with reference to fig. 5, a heated drier 14 may also be provided on the box 7 b. The heating dryer 14 can dry the bagged grain in the box body 7b in a manner of raising the temperature inside the box body, so that the humidity of the bagged grain can be changed. In the case that the turning plate 13a rotates around the supporting seat 13b so that at least two parameters of the bagged grain positioned above the turning plate 13a are changed, the second detection mechanism 7 can capture rays emitted by the bagged grain positioned above the turning plate 13a in a discontinuous time and discontinuous space manner, wherein the at least two parameters at least comprise a gravity center parameter and a humidity parameter. The time discontinuity is that in an acquisition period of, for example, 10 seconds, the second detector 7a acquires the radiation emitted by the bagged grain not continuously for 10 seconds, but at a set acquisition frequency of, for example, once every 2 seconds. The spatial discontinuity means that the second detector 7a is not in an operating state for continuously acquiring the radiation during the continuous rotation of the flipping board 13a, but performs the radiation acquisition when the inclination angle α is at a set angle, such as 15 °, 30 °, 45 °, or 60 °. Through the above setting mode, can reach following technological effect at least: the background radiation amount is small, and the radiation background value also has a normal fluctuation range. When the additional radiation brought by the grains is judged, the detected radiation value changes along with the rotation of the turnover plate. If the difference of the radiation values is continuously collected, because the radiation in the bagged grain to be detected and the background radiation have an accumulation effect, the over-range data collected at extremely individual time points does not mean that the radiation exceeds the standard, and sometimes, the over-low numerical value does not mean that the radiation is safe. Therefore, the continuous detection method requires a large amount of data comparison to eliminate abnormal data, which has adverse effects on detection time, operation cost and data collection. Especially for the condition that a large amount of grain to be detected is packaged. The invention adopts the technical scheme that the detection of discontinuous time and space is carried out when the turnover plate rotates to a set angle, and particularly, the rotation is accompanied or even caused by double discontinuity of time and space. The method not only solves the problem of eliminating the interference caused by abnormal fluctuation of background radiation, but also solves the technical problem that the granular or tuber-shaped food is difficult to detect due to the attachment of trace radiants. In addition, the detector is high-sensitivity and high-value detection equipment easy to age, intermittent operation has obvious positive effects on the influence of dust on the detector and the service life of a detection element, and the precision can be further improved and the cost can be reduced.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims (8)

1. A full-bag type grain radioactivity detection device at least comprises:

the conveying mechanism (1) can be used for placing bagged grain (8), so that the bagged grain (8) can enter a detection range of a first detection mechanism (2) located at the downstream of the conveying mechanism (1) along a set direction through the conveying of the conveying mechanism (1);

a first detection mechanism (2) which can be used for collecting radioactivity data of the bagged grain (8), wherein the distance between the first detection mechanism (2) and the bagged grain (8) detected by the first detection mechanism can be increased or decreased, so that the radiation emitted by the bagged grain (8) can be captured by the first detection mechanism (2) according to the mode that the resolution of the first detection mechanism (2) can be adjusted;

-data analysis means (3) able to classify said bagged grain (8) into at least a first and a second category of products on the basis of said radioactive data and to generate control commands for controlling the sorting means (4) to perform sorting operations;

a sorting mechanism (4) capable of separating the products of the first type and the products of the second type in a manner to perform the sorting operation in response to the control command,

it is characterized in that the preparation method is characterized in that,

the full-bag grain radioactivity detection device further comprises a second detection mechanism (7) which is positioned at the upstream of the first detection mechanism (2) and is provided with a containing cavity (7c) capable of containing at least two bags of bagged grains (8), and the full-bag grain radioactivity detection device is configured to perform radioactivity detection in the following mode:

determining a trend of change of the total amount of radiated energy in the accommodating cavity (7c) under the condition that the conveying mechanism (1) rotates to enable a first bagged grain (8a) to enter the accommodating cavity (7c) and a second bagged grain (8b) in the accommodating cavity (7c) to be discharged out of the accommodating cavity (7 c);

in case of an increasing trend of the total amount of radiated energy, said conveying means (1) is configured to rotate at a first rotation speed, so that said first detection means (2) is able to perform data acquisition of the first bagged grain (8a) entering the containing cavity (7c) for a first set time, and said data analysis means (3) performs a radioactive detection of the first bagged grain (8a) in such a way as to perform a first operation,

in case of a decreasing trend of the total amount of radiated energy, the conveyor means (1) is configured to rotate at a second rotation speed, so that the first detection means (2) can perform data acquisition of the first bagged grain (8a) entering the containing cavity (7c) for a second set time, and the data analysis means (3) performs a radioactivity detection of the first bagged grain (8a) in a manner of performing a second operation, wherein:

the first rotational speed is less than the second rotational speed such that the first set time is greater than the second set time.

2. The full-bag grain radioactivity detection device according to claim 1, wherein the full-bag grain radioactivity detection device is further configured to perform radioactivity detection as follows:

under the condition that the accommodating cavity (7c) can accommodate N bags of second bagged grains (8b) and N bags of first bagged grains (8a) are arranged on the conveying mechanism (1), the second bagged grains (8b) are associated with the first bagged grains (8a) at intervals of N-1 bags of the first bagged grains (8 a);

in case the total amount of radiated energy in the receiving cavity (7c) increases and it is determined that the second bagged grain (8b) belongs to the second type of product, the first bagged grain (8a) associated with the second bagged grain (8b) is determined as the second type of product, or as the second type of product, by skipping the radioactivity detection

In case the total amount of radiated energy in the receiving cavity (7c) is reduced and it is determined that the second bagged grain (8b) belongs to the first type of product, the first bagged grain (8a) associated with the second bagged grain (8b) is determined as the first type of product by skipping the radioactivity detection.

3. The full-bag grain radioactivity detecting device according to claim 2, wherein in case that the total amount of radiated energy in the accommodating cavity (7c) is increased and the second bagged grain (8b) is determined to belong to the first type of product, the first bagged grain (8a) associated with the second bagged grain (8b) is further determined in a manner of performing the first operation, or

In case the total amount of radiated energy in said receiving cavity (7c) is reduced and it is decided that the second bagged grain (8b) belongs to the second type of product, the first bagged grain (8a) associated with the second bagged grain (8b) is further decided in such a way that said first operation is performed.

4. The full-bag grain radioactivity detecting device according to claim 3, further comprising a turnover mechanism (13) and a heating dryer (14) which can be used together with the second detecting mechanism (7) and are arranged in the accommodating cavity (7c), wherein:

the turnover mechanism (13) can be used for placing the bagged grain (8) and changing the gravity center parameter of the bagged grain (8) on the turnover mechanism in a mode of rotating relative to the conveying mechanism (1) to change the inclination angle (alpha) between the turnover mechanism and the conveying mechanism (1);

the heating dryer (14) can at least change the humidity parameter of the bagged grains positioned above the turnover mechanism (13) in a mode of changing the temperature of the accommodating cavity (7 c);

the second detection mechanism (7) can capture rays emitted by bagged grains on the turnover mechanism (13) in a discontinuous time and discontinuous space mode.

5. The full bag type grain radioactivity detecting device according to claim 4, wherein the sorting mechanism (4) comprises a first conveyor belt (4b), a second conveyor belt (4c) and a sorting box (4a) with at least two storage cavities (5), and in the case that the bagged grain (8) is conveyed by the conveying mechanism (1) to enter one of the storage cavities (5), the sorting box (4a) can align the storage cavity (5) with the first conveyor belt (4b) or the second conveyor belt (4c) according to a set angle of rotation around the central axis of the sorting box (4 a).

6. The full-bag grain radioactivity detecting device according to claim 5, wherein the first conveyor belt (4b) and the second conveyor belt (4c) are arranged on a base (12) in a parallel manner, at least one guide plate (4d) is hinged on the base (12), and the sorting operation is completed according to the following steps:

in case it is determined that the bagged grain (8) in the storage chamber (5) belongs to a first type of product, the guide plate (4d) is configured to rotate about its hinge point in a first direction to bring the storage chamber (5) into communication with the first conveyor belt (4 b);

in case it is determined that the bagged grain (8) in the storage chamber (5) belongs to the second type of product, the guide plate (4d) is configured to rotate about its hinge point in the second direction to bring the storage chamber (5) into communication with the second conveyor belt (4 c).

7. The full-bag grain radioactivity detection apparatus according to any of claims 1-6, wherein the first operation comprises at least a spectrum generation process and a spectrum de-generation process, and the second operation comprises at least the spectrum generation process and a spectrum comparison process, wherein:

the first detection mechanism (2) comprises at least a first probe (2a), the second detection mechanism (7) comprises at least a second probe (7a), the data analysis mechanism (3) comprises at least a server (3a), wherein the server (3a) is configured to perform the energy spectrum generation process, the de-spectroscopy process and the energy spectrum comparison process;

each bagged grain (8) is provided with an electronic tag (9), so that the server (3a) can acquire the serial number of the bagged grain (8) based on the electronic tag (9) to complete the differentiation of the bagged grain (8).

8. The full-bag type grain radioactivity detection method is characterized by at least comprising the following steps:

a conveying mechanism (1) capable of being used for placing bagged grains (8) is configured, so that the bagged grains (8) can enter a detection range of a first detection mechanism (2) located at the downstream of the conveying mechanism (1) along a set direction through the conveying of the conveying mechanism (1);

-a first detection means (2) configured for acquiring radioactive data of the bagged grain (8), wherein the distance between the first detection means (2) and the bagged grain (8) detected by it can be increased or decreased, so that the radiation emitted by the bagged grain (8) can be captured by the first detection means (2) in such a way that the resolution of the first detection means (2) can be adjusted;

-configuring a data analysis mechanism (3) capable of classifying said bagged grain (8) into at least a first type of product and a second type of product based on said radioactivity data, wherein said data analysis mechanism is further capable of generating control commands for controlling a sorting mechanism (4) to perform a sorting operation;

-configuring a sorting mechanism (4) capable of separating said first type of products and said second type of products in a manner to perform said sorting operation in response to said control commands;

-configuring a second detection mechanism (7) located upstream of said first detection mechanism (2) and having a housing cavity (7c) capable of housing at least two bags of bagged grain (8), wherein:

determining a trend of change of the total amount of radiated energy in the accommodating cavity (7c) under the condition that the conveying mechanism (1) rotates to enable a first bagged grain (8a) to enter the accommodating cavity (7c) and a second bagged grain (8b) in the accommodating cavity (7c) to be discharged out of the accommodating cavity (7 c);

-in case of an increasing trend of the total amount of radiated energy, configuring said conveying means (1) to rotate at a first rotation speed, so that said first detection means (2) are able to perform a data acquisition of the first bagged grain (8a) entering the containing cavity (7c) for a first set time, and configuring said data analysis means (3) to perform a radioactivity detection of the first bagged grain (8a) in such a way as to perform a first operation,

-in the case of a decreasing trend of the total amount of radiated energy, configuring the conveyor means (1) to rotate at a second rotation speed, so that the first detection means (2) are able to perform a data acquisition of the first bagged grain (8a) entering the containing cavity (7c) for a second set time, and configuring the data analysis means (3) to perform a radioactivity detection of the first bagged grain (8a) in such a way as to perform a second operation, wherein:

the first rotational speed is less than the second rotational speed such that the first set time is greater than the second set time.

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