JP2018109641A - Software program for gamma beam automatic monitoring facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a software program for automatic monitoring facility capable of finding radioactive substance mixed in scraps, which are loaded on a loading space of a vehicle and transported.SOLUTION: A software program for automatic monitoring facility comprises: acquiring at least a vehicle width with calculation or measurement; calculating a loading space central gate distance T5 from a central virtual line X in a width direction of a loading space of a vehicle to a one-sided loading space, and a loading central gate distance T6 from the central virtual line in the width direction of the loading space of the vehicle to the other side loading space, based on the acquired vehicle width; and calculating a Becquerel value of a gamma ray radiation source in a case of assuming that the gamma ray radiation source exists on the central virtual line in the width direction of the loading space of the vehicle.SELECTED DRAWING: Figure 4

Description

  The invention of the present application is intended to apply radioactive substances mixed in metal scrap, industrial waste, building waste, rubble, earth and sand, wood, etc. (hereinafter referred to as scrap, etc.) loaded and transported on a vehicle bed, This is a software program for an automatic gamma ray monitoring facility for discovery at the entrance of a waste treatment facility (hereinafter referred to as the boundary of the facility).

  There are devices that measure the distribution of gamma-emitting nuclides by detecting gamma rays.

  For example, an apparatus is disclosed that measures the distribution in the depth direction of gamma-ray emitting nuclides existing inside a wall by performing measurement at a plurality of locations while moving a radiation measuring instrument and calculating the data using a predetermined equation. (Patent Document 1).

Japanese Patent Laid-Open No. 62-282288

  The above-mentioned patent document 1 is an apparatus for measuring the distribution in the depth direction of gamma-ray emitting nuclides present on the concrete wall surface, and is assumed to be an apparatus in the case where an object that emits gamma rays (gamma-ray emission source) does not move. . Therefore, it is considered that it cannot be used or is not suitable as a facility for finding radioactive substances mixed in scraps and the like loaded and transported on the loading platform of the vehicle at the boundary of the facility.

  In addition, as an existing facility that the applicant is developing, introducing, and maintaining, a gate with a gamma ray detection mechanism is installed in the vehicle approach path, and radioactive materials mixed in scraps, etc. loaded and transported on the loading platform of the vehicle. Automatic monitoring equipment is found at the boundary of facilities, etc. (radioactive substance discovery judgment is judged by the magnitude of the sievert value detected by the gamma ray detection mechanism and processed by the information processing device).

  By the way, in the display of the regulation value of the radioactive material in recent years, the display of the becquerel unit is used, but it is difficult to simply convert the sievert value (unit) to the becquerel value (unit).

  Therefore, it is an object to provide a software program for automatic gamma-ray monitoring equipment that can detect radioactive substances mixed in scraps that are loaded and transported on the loading platform of vehicles at the boundaries of facilities, etc., and that can also display in units of becquerel. It was.

  Also, since the gamma dose detected by the gamma ray detection mechanism varies (increases or decreases) depending on the distance between the gamma ray detection mechanism and the gamma ray emission source and the type of load, the gamma ray also takes into account the amount of attenuation (variation). The problem was to provide a software program for automatic monitoring equipment.

  The invention of the present application includes a step of obtaining at least a vehicle width by calculation or measurement, a platform center gate distance from a center virtual line in the width direction of the vehicle platform to a cargo platform on one side, and a vehicle platform using the acquired vehicle width. Calculating the center gate distance from the center imaginary line in the width direction to the platform on the other side of the vehicle, and the becquerel of the gamma ray source when it is assumed that a gamma ray source exists on the center imaginary line in the width direction of the vehicle platform A software program for an automatic gamma ray monitoring facility comprising the steps of calculating a value.

  Further, in the present invention, the step of calculating the becquerel value of the gamma ray emission source on the assumption that the gamma ray emission source is present on the center virtual line in the width direction of the loading platform of the vehicle is calculated based on at least the effective area of the gamma ray detection mechanism. There is provided a software program for an automatic gamma ray monitoring facility characterized in that it is a step using the total amount of gamma rays and the center gate distance of the loading platform.

  The software program for the gamma ray automatic monitoring facility according to the present invention includes at least a step of obtaining the vehicle width by calculation or measurement, and using the obtained vehicle width from the center virtual line in the width direction of the vehicle carrier to the one side carrier And calculating the center gate distance of the vehicle platform and the center gate distance of the vehicle platform from the center virtual line in the width direction to the other platform, and assuming that a gamma ray emission source exists on the center virtual line in the width direction of the vehicle platform. In this case, the calculation of the becquerel value (unit) and the output (display) are possible.

  In addition, the software program for the gamma ray automatic monitoring facility according to the present invention includes a calculation step for calculating the becquerel value using the total amount of gamma rays based on the effective area of the gamma ray detection mechanism and the center gate distance of the loading platform. By creating a parameter based on the distance between the light source and the gamma-ray emission source and information on the distance, it is possible to perform arithmetic processing in consideration of attenuation of the gamma dose.

FIG. 1 is an overall view of a gamma ray automatic monitoring facility. FIG. 2 is an enlarged view of the gate. FIG. 3 is a diagram showing the layout inside the box and the configuration of the information processing mechanism. FIG. 4 is a plan view showing the configuration and operation of the distance measuring mechanism. FIG. 5 is an output display screen (becquerel value display, gamma ray detection location display) of the gamma ray automatic monitoring equipment software program. FIG. 6 is an output display screen (gamma dose sievert display) of the gamma ray automatic monitoring equipment software program.

  It is implemented as a software program that is installed in an information processing device that constitutes an automatic gamma ray monitoring facility.

  First, the configuration of the gamma ray automatic monitoring facility will be described with reference to FIGS.

  The gamma ray automatic monitoring facility (1) includes a gate (10) provided so as to sandwich both sides of the vehicle approach path (A), a vehicle detection mechanism (20) for detecting entry of the vehicle (B), and a load of the vehicle A gamma ray detection mechanism (30) attached to the gate for detecting gamma rays radiated from the gate, and a gate to measure the distance from the gate to the side surface of the loading platform of the vehicle (hereinafter referred to as loading platform side gate distance). A distance measuring mechanism (40), and an information processing mechanism (50) for receiving gamma ray information transmitted from the gamma ray detecting mechanism and cargo bed side gate distance information transmitted from the distance measuring mechanism and performing various arithmetic processes. And a warning output device (60) for prompting a warning based on information output from the information processing mechanism (FIG. 1).

  The gate (10) includes a standing structure (11) on one side and a standing structure (12) on the other side, which are erected opposite to each other across the vehicle approach path (A). The structure includes an inlet-side column (111) and an outlet-side column (112), which are metal columns having an H-shaped cross section, and a box (113) sandwiched between the inlet-side column and the outlet-side column. (FIG. 2).

  Further, the other side standing body (12) includes an inlet side column (121) and an outlet side column (122), which are metal columns having an H-shaped cross section, and the inlet side column and the outlet side column. It is comprised with the box (123) pinched | interposed between (FIG. 2).

  In addition, about the structure of the said gate (10), although it is set as the structure erected facing across the vehicle approach path in a present Example, the loading platform side gate distance information transmitted from the said distance measurement mechanism can be acquired. Different configurations are possible as long as they are configured. For example, a configuration in which the gates constructed opposite to each other are further installed to surround three sides of the vehicle approach path, or a configuration in which one side and the upper side of the vehicle approach path are surrounded by two sides in an inverted L shape is also allowed. To get.

  The vehicle detection mechanism (20) includes an inlet-side light projector (21) installed at a lower stage of the other-side inlet-side column (121) and an inlet-side light reception installed at a middle stage of the one-side inlet-side column (111). , An outlet-side projector (22) installed in the middle stage of the other outlet-side column (122), and an outlet-side light receiver (24) installed in the lower stage of the one-side outlet-side column (112) ) And (FIG. 2).

  In addition, it may be allowed to add a function of measuring the moving speed of the vehicle to the vehicle detection mechanism (20).

  The inlet-side light projector (21) and the inlet-side light receiver (23) function as a pair, and the outlet-side light projector (22) and the outlet-side light receiver (24) function as a pair.

  As for the arrangement of the projectors (21, 22) and the light receivers (23, 24), any arrangement may be used as long as the entry of the vehicle is properly detected, but without misdetecting the vehicle (B) of various external shapes and uses. The arrangement of this embodiment capable of detecting the approach and moving speed is preferable.

  The gamma ray detection mechanism (30) is attached to the first scintillator (31) and the second scintillator (32) installed inside the box (113) on the one side, and inclined to the lower left corner of the first scintillator. A first photomultiplier tube (35) and a second photomultiplier tube (36) attached to be inclined at the upper right corner of the second scintillator, and a third scintillator (33) installed inside the box (123) on the other side. ) And the fourth scintillator (34), the third photomultiplier tube (37) attached to the lower left corner of the third scintillator and the fourth photomultiplier tube (38) attached to the upper right corner of the fourth scintillator. ) (FIG. 3).

  The first photomultiplier tube (35) is attached to the first scintillator (31) by inclining it toward the notch in the lower left corner. The internal space of (113) can be used effectively, and the storage efficiency is improved. Further, it is considered that there is an effect of reducing the case where light (including reflected light) generated by the first scintillator is not recognized by the first photomultiplier tube.

  The same applies to the mounting form of the second electron multiplier tube (36). Further, the third electron multiplier tube (37) and the fourth electron multiplier tube (38) are also mounted in the same manner as in the box (113), although not shown.

  The photomultiplier tubes (35, 36, 37, 38) refer to devices that convert weak light emitted from the corresponding scintillators (31, 32, 33, 34) into electric signals and amplify them. And

  The distance measuring mechanism (40) includes a first distance sensor (41) installed on one side (left side shown in FIG. 2), and a second distance sensor (42) installed on the other side (right side shown in FIG. 2). (Fig. 2).

  The first distance sensor (41) is hardware for measuring a loading platform side gate distance (T2) from the gate (10) to the side of the loading platform on one side of the vehicle (left side shown in FIG. 4) (FIG. 4). ).

  The second distance sensor (42) is hardware for measuring a load carrier side gate distance (T3) from the gate (10) to the side of the load carrier on the other side of the vehicle (the right side shown in FIG. 4) (FIG. 4). ).

  The height at which the first distance sensor (41) and the second distance sensor (42) are attached is preferably a height corresponding to the loading platform of the vehicle.

  For the first distance sensor (41) and the second distance sensor (42), hardware that performs laser measurement is adopted, but any measurement method may be used. For example, an ultrasonic method may be used.

  The distance measuring mechanism (40) of the present embodiment measures the load side surface gate distance (T2, T3) from the gate to the side surface of the vehicle load platform.

  Note that the distance measuring mechanism may directly measure the vehicle bed width (T4).

  The information processing mechanism (50) includes an information processing device (55) and a controller unit (51, 52, 53, 54) connected to the photomultiplier tube by performing signal processing for enhancing waveform shaping and noise resistance. Configure (FIG. 3).

  The information processing device (55) may be any device as long as it can receive information transmitted from the gamma ray detection mechanism, the distance measurement mechanism, or the vehicle detection mechanism. In this embodiment, a personal computer in which a versatile operating system is installed is used.

  On the information processing device (55), a software program for receiving the loading platform side gate distance information (T2, T3) transmitted from the distance measuring mechanism and calculating the loading platform central gate distance (T5, T6). Is in operation. When the distance measuring mechanism (40) has a configuration (equipment) that directly measures the platform width (T4) of the vehicle, it receives the platform width measurement information (T4) transmitted from the distance measuring mechanism. It is assumed that a software program for calculating the load carrier center gate distance (T5, T6) is running.

  In the software program running on the information processing device (55), an operation based on information from the distance measurement mechanism (40) (an operation for outputting a becquerel value, an operation in consideration of gamma dose attenuation, etc.), Various calculation processes such as calculation of a gamma dose based on information from the gamma ray detection mechanism (30) are performed.

  The calculation considering the attenuation of the gamma dose refers to a calculation for adjusting the sievert value based on information from the distance measuring mechanism.

  Note that hardware such as a relay device or a relay board may be interposed between the information processing device (55) and the controller units (51, 52, 53, 54).

  The warning and other output device (60) refers to a warning lamp that notifies the warning by light, a speaker that notifies the warning by sound, or the like based on the output information from the information processing device (55) (FIG. 1).

  The warning output can be output not only to the warning output device but also to a display, a printer, or the like connected to the information processing apparatus.

  Next, an example of a case where cesium 137 (Cs137) is mixed in a vehicle load will be described with reference to FIGS.

  When a vehicle loaded with scraps including cesium 137 (Cs137) on the loading platform passes between the entrance-side light projector (21) and the entrance-side light receiver (23), the intrusion of the vehicle is detected, and each mechanism operates. (FIG. 2).

  Specifically, regarding the gamma ray detection mechanism (30), when gamma rays are incident on the first scintillator (31), a weak light emission phenomenon occurs in a short time. The emitted light is converted into a radiation count signal (electric signal) by the first photomultiplier tube (35), amplified, and transmitted to the information processing device (55) via the first controller unit (51) (FIG. 3). ).

  Similarly, the weak light emission generated in the second scintillator (32), the third scintillator (33), and the fourth scintillator (34) in a short time is generated by the second photomultiplier tube (36) and the third scintillator (34). The photomultiplier tube (37) and the fourth photomultiplier tube (38) convert and amplify the radiation count signal, and the second controller unit (52), the third controller unit (53), and the fourth controller unit. (54) to the information processing device (55) (FIG. 3).

  Specifically, with respect to the distance measuring mechanism (40), the first distance sensor (41) and the second distance sensor (42) measure the platform side gate distances (T2, T3) and transmit them to the information processing apparatus ( FIG. 4).

  Specifically, for the information processing mechanism (50), the platform side gate distance information (T2, T3) received by the information processing device (55) is calculated by the software program as the platform center gate distance (T5, T6). .

  Specifically, first, the platform width (T4) of the vehicle is calculated by subtracting the platform side gate distance information (T2, T3) from the inter-gate distance (T1) by a software program.

  Next, the distance from the side surface of the vehicle carrier to the center virtual line (X) in the width direction of the vehicle carrier is calculated by reducing the vehicle carrier width information (T4) by half.

  Further, the loading platform side gate distance (T2) on one side (left side) is added to the distance from the loading platform side surface to the center virtual line (X) in the width direction of the loading platform of the vehicle, whereby the loading platform on one side is added. A center gate distance (T5) is calculated, and the other side (right side) loading platform side gate distance (T3) is added to the distance from the loading platform side surface of the vehicle to the center virtual line (X) in the width direction of the loading platform of the vehicle. By this, the said loading platform center gate distance (T6) of the other side is also calculated.

  For example, the distance (T1) between the gates is 300 centimeters, the measured value (T2) of the first distance sensor is 50 centimeters, and the measured value (T3) of the second distance sensor is 80 centimeters. In this case, since the loading platform width (T4) of the vehicle is T4 = T1- (T2 + T3) as described above, 170 cm is calculated by 300- (50 + 80).

  Moreover, since the said loading platform center gate distance (T5) of one side (left side) is T5 = T2 + (T4 / 2) as above-mentioned, 135 centimeters are calculated by 50+ (170/2). Further, since the load carrier center gate distance (T6) on the other side (right side) is also T6 = T3 + (T4 / 2), 165 centimeters is calculated as 80+ (170/2).

  Next, based on the cargo bed center gate distance information (T5, T6), the becquerel value of the gamma ray emission source is calculated when it is assumed that the gamma ray emission source exists on the center virtual line (X) in the width direction of the vehicle bed. After the calculation process, both the becquerel value and the sievert value are displayed and output on the display connected to the information processing apparatus (maximum value display in the upper right of FIG. 5).

  In addition, the location where the gamma rays are detected (FIG. 5) and the gamma dose (count value) detected by the fourth scintillator from the first scintillator are also displayed and output (maximum values of detectors 1 to 4 in FIG. 6).

  Regarding the calculation algorithm for calculating the becquerel value of the gamma ray emission source when it is assumed that the gamma ray emission source is present on the center virtual line in the width direction of the vehicle carrier, the carrier center gate distance information (T5, T6), from the gamma ray emission source Combining factors such as the total amount of gamma rays that can be detected by a scintillator with an effective area of 4900 square centimeters, gamma rays emitted in all directions, natural radiation dose, and empirical conversion efficiency (calculated from the total amount of gamma rays and actual measured values) An arithmetic algorithm is generated.

  The vehicle bed width information (T4) includes vehicle bed width measurement information.

  Since the software program for the gamma ray automatic monitoring facility of the present invention is a software program that dramatically improves convenience, it has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Gamma ray automatic monitoring equipment 10 Gate 11 One side standing body 111 One side entrance side support | pillar 112 One side exit side support | pillar 113 One side box 12 Other side standing body 121 The other side entrance side support | pillar 122 The other Side outlet side column 123 Other side box 20 Vehicle detection mechanism 21 Entrance side projector 22 Exit side projector 23 Entrance side receiver 24 Exit side receiver 30 Gamma ray detection mechanism 31 First scintillator 32 Second scintillator 33 Third scintillator 34 Fourth scintillator 35 First photomultiplier tube 36 Second photomultiplier tube 37 Third photomultiplier tube 38 Fourth photomultiplier tube 40 Distance measuring mechanism 41 First distance sensor 42 Second distance sensor 50 Information processing mechanism 51-54 First -4th controller unit 55 Information processing device 60 Warning etc. output device A Vehicle approach path B Car C truck scale T1 gate distance T2 bed side gate distance (measured value of the first distance sensor)
T3 cargo bed side gate distance (measured value of the second distance sensor)
T4 Car bed width T5 Cargo center gate distance (calculated value on one side)
T6 platform center gate distance (calculated value on the other side)
X Center imaginary line in the width direction of the loading platform of the vehicle

Claims (2)

Obtaining at least a vehicle width by calculation or measurement;
Using the acquired vehicle width, the load center central gate distance (T5) from the width direction central virtual line (X) of the vehicle bed to the load bed on one side and the load bed on the other side from the width direction virtual center line of the vehicle load bed A step of calculating a center gate distance (T6) until
Calculating a becquerel value of the gamma ray emission source when it is assumed that a gamma ray emission source exists on the center virtual line in the width direction of the loading platform of the vehicle;
A software program for gamma-ray automatic monitoring equipment. The step of calculating the becquerel value of the gamma ray emission source when it is assumed that the gamma ray emission source is present on the central virtual line in the width direction of the vehicle loading platform,
2. The software program for an automatic gamma ray monitoring facility according to claim 1, wherein the software program is a step using at least a total amount of gamma rays calculated based on an effective area of the gamma ray detection mechanism and the center gate distance of the loading platform.