JP6215530B2 - Radiation display method and radiation display device - Google Patents

Description

  The present invention relates to a technique for displaying radiation.

  In order to intuitively recognize the radiation distribution in the space, it is considered effective to display the radiation distribution three-dimensionally. Conventionally, as a method of displaying the radiation distribution three-dimensionally, there is a method of displaying the radiation dose distribution using contour lines or cross sections (for example, Patent Document 1 below).

JP-A-2005-49148

However, in the conventional three-dimensional display method (display by contour lines and cross sections), although the intensity of radiation at the site can be recognized, it has not been possible to indicate where the radiation source is.
The present invention has been completed based on the above circumstances, and an object thereof is to propose a display method capable of showing information (position and direction) of a radiation source.

  The radiation display method of the present invention is characterized in that particles indicating radiation are moved and displayed in the direction of the radiation in a number corresponding to the intensity of the radiation within each three-dimensional mesh dividing the space. The radiation includes particle beams such as α rays and β rays and electromagnetic waves such as γ rays.

  The radiation display device of the present invention includes the radiation intensity at the evaluation point in each three-dimensional mesh that divides the space, the radioactivity of the radiation source, the distance from the radiation source to the evaluation point, the radiation source, and the three-dimensional mesh. A calculation unit that calculates based on a structure existing on a straight line connecting the evaluation points, a display unit, and the display unit, the particles indicating the radiation in the three-dimensional mesh A display control unit that moves and displays a number corresponding to the intensity of the radiation in the direction of the radiation is characterized. Radioactivity means the type and amount of radioactive material.

  In the present invention, the intensity of radiation can be recognized from the number of displayed particles, and the position of the radiation source can be recognized from the moving direction of the particles.

As an embodiment of the present invention, the following configuration is preferable.
The number of the particles representing the radiation is an exponential function of the intensity of the radiation. Since the change in the number N of particles increases with respect to the change in the intensity of radiation, the user can easily recognize the change in the intensity of radiation.

In each of the three-dimensional meshes, the generation position and generation time of the particles indicating the radiation are made random. If the movement path of particles and the generation time of particles overlap between the three-dimensional meshes, the movement of the particles U becomes regular and the display becomes unnatural. By preventing the particle generation position and the particle generation time from overlapping between the three-dimensional meshes, the movement of the particles becomes irregular and the display becomes natural.

In response to the input operation, at least one of the size, moving speed, and number of particles indicating the radiation is collectively changed in each of the three-dimensional meshes. Since the display can be adjusted, the display becomes easy to see.

  According to the present invention, in addition to the intensity of radiation, it is possible to indicate radiation source information (that is, position and direction).

The figure which displayed the radiation radiated | emitted from a radiation source with particle | grains in Embodiment 1. Diagram showing the structure of the reactor building Perspective view of radiation display device Block diagram showing the electrical configuration of the computer body Diagram showing radiation distribution display flow Top view of the containment (schematic diagram) Diagram showing dose rate calculation sequence Diagram showing the contents of display processing The figure which shows the example of a display of particle | grains U The figure which shows the example of a display of particle | grains U The figure which shows the example of a display of particle | grains U Figure showing the flow of particles with arrows (Figure showing the effect of the invention) In Embodiment 2, the graph which showed the relationship between the dose rate D and the particle number N The figure which shows the magnitude | size of particle | grains in Embodiment 3 (it shows before and after a change) In Embodiment 4, the figure which shows the particle number of particle | grains (it shows before and after a change)

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The display method shown in Embodiment 1 displays the distribution of radiation in space using particles U (see FIG. 1). In this display method, the number of particles U to be displayed is a number corresponding to the intensity of radiation (dose rate D) in each part in the space, and each particle U is moved and displayed in the direction of the radiation. By adopting such a display mode, it is possible to recognize the intensity of radiation at the location from the number of particles U displayed in each part, and to recognize the position and direction of the radiation source from the moving direction of the particles U. I can do it.

  Hereinafter, a method for displaying the distribution of radiation (gamma rays as an example) will be described taking a reactor building as an example. FIG. 2 is a diagram schematically showing the structure of the reactor building. Reference numeral 10 is a containment vessel, reference numeral 12 is a pressure vessel, and reference numeral 16 is a pipe serving as a radiation source. The pipe 16 serves as a radiation source because water containing a radioactive substance circulates in the pipe.

  FIG. 3 shows a radiation display device 20 that displays the distribution of radiation. The radiation display device 20 includes a computer main body 21 having a calculation function and a display control function of the monitor 35, a keyboard 31, a mouse 33, and a monitor 35. The electrical configuration of the computer main body 21 is as shown in FIG. 4. In order to store various types of data, an arithmetic control unit 22 composed of a CPU, a ROM 23 storing a radiation distribution display flow execution program shown in FIG. RAM 24 and interface 25.

  Then, the calculation control unit 22 of the computer main body 21 executes the radiation distribution display flow shown in FIG. 5, thereby calculating the radiation intensity (dose rate D at each point) in the internal space of the storage container 10. Based on the obtained result, the radiation distribution in the internal space of the storage container 10 is displayed on the monitor 35 using particles U that simulate radiation.

  As shown in FIG. 5, the radiation distribution display flow includes six steps from S <b> 10 to S <b> 60, and in S <b> 10, processing for reading input data is executed by the arithmetic control unit 22. The input data referred to here is storage container data, radiation source data, and data of a structure that becomes a radiation shield.

  The storage container data is data relating to the size, shape, etc. of the storage container 10. The radiation source data is data on the size, material, shape, and position of the pipe 16 serving as the radiation source, and measurement data on the radiation intensity (pipe dose rate) around the pipe. The data of the structure is the material, thickness, size, shape, position and content of the structure installed in the containment vessel 10, such as piping including pumps and piping that serves as a radiation source, and shielding materials made of lead and iron. Data such as the presence / absence / type of an object.

  When the input data is read, the calculation control unit 22 executes a process for reading calculation conditions (S20). The calculation conditions are a condition relating to the evaluation point mesh G composed of a three-dimensional lattice dividing the internal space of the storage container 10 (for example, the size of the evaluation point mesh), and a division condition of the source J (for example, division of the source J). Number m), and the division condition of the structure (for example, the division number r of the structure).

  Thereafter, when the reading of the calculation conditions is completed, the process moves to S30, and the processing of dividing the radiation source J and the structure K on the data according to the calculation conditions is executed by the arithmetic control unit 22. For example, in the example of FIG. 6, two sets of pipes (indicated by a thick line frame in the figure) serving as the radiation source J pass inside the storage container 10, and the two sets of pipes 16A and 16B are divided into a total of m pieces. It will be. In the example of FIG. 6, four shielding materials are installed in front of the pipes 16 </ b> A and 16 </ b> B serving as the radiation source J, and the four shielding materials 18 </ b> A to 18 </ b> D are divided into a total of r pieces. Will be.

  FIG. 6 is a plan view showing a part of the internal space of the storage container. In FIG. 6, a one-dot chain grid G indicates an evaluation point mesh, and the center of the grid indicates each evaluation point I. Since FIG. 6 is a plan view, the evaluation point mesh G is shown as a two-dimensional lattice, but it should be noted that the actual evaluation point mesh is a three-dimensional lattice.

  When the process of S30 is completed, the process proceeds to S40. In S40, the calculation control unit 22 calculates the radiation dose rate D at each evaluation point. The radiation dose rate calculation includes the processes of S41 to S46 shown in FIG. 7 (dose rate calculation sequence).

  To explain in order, first, in S41, the evaluation points In are read out sequentially from the first, and in S42, the radiation source Jm is read out sequentially from the first. In S43, a process of determining whether the structure (the shielding material 18 in this example) is shielded between the evaluation point In and the radiation source Jm is executed.

  Since the evaluation point In and the radiation source Jm that are read first are both No. 1, in the example of FIG. 6, the structure (the shielding material 18 in this example) is between the evaluation point I1 and the radiation source J1. Is determined to be occluded.

  In the example of FIG. 6, since the shielding material 18A is off the straight line connecting the evaluation point I1 and the radiation source J1, it is determined that there is no structure that shields between the evaluation point I1 and the radiation source J1. The Thereafter, the process proceeds to S44.

  In S44, the dose rate D (In, Jm) from the radiation source Jm at the evaluation point In, that is, the amount of radiation per unit time is calculated. Specifically, first, based on the measurement data of the radiation intensity (pipe dose rate) in the pipe periphery measured by a germanium semiconductor detector and the like, the radiation source (pipe) ) The radioactivity of Jm, that is, the type and amount of radioactive material of the source Jm is calculated.

  Based on the calculated radioactivity of the radiation source Jm and the distance from the radiation source Jm to the evaluation point In, the dose rate D (In, Jm) from the radiation source Jm at the evaluation point In is calculated. Therefore, here, based on the radioactivity of the radiation source J1 and the distance from the radiation source J1 to the evaluation point I1, the dose rate D (I1, J1) from the radiation source J1 is calculated for the evaluation point I1. Become.

  When the calculation of the dose rate D (I1, J1) is completed in S44, the process returns to S42 and the second radiation source J2 is read. In S43, it is determined whether the structure (the shielding material 18 in this example) is shielded between the evaluation point I1 and the radiation source J2.

  In the example of FIG. 6, since a part of the shielding material 18A overlaps on a straight line connecting the evaluation point I1 and the radiation source J2, the structure that shields between the evaluation point I1 and the radiation source J2 is It is determined that there is. Thereafter, the process proceeds to S44.

  In S44, the dose rate D (I1, J2) from the radiation source J2 is calculated for the evaluation point I1. Since the evaluation point I1 and the radiation source J2 are blocked by a part K1 of the shielding material 18A, the dose rate D (I1, J2) takes into account the shielding by the part K1 of the shielding material 18A. Thus, the dose rate D is calculated according to the following equation (1).

D (I1, J2) = D ₀ (I1, J2) × e ^{(−μ × t)} (1)

D ₀ is a dose rate when the shielding material is not taken into consideration. “Μ” is a γ-ray attenuation coefficient corresponding to the material of the shielding material. “T” is the thickness of the shielding material.

  The calculation of the dose rate D in consideration of the shielding by the shielding material is repeated for all the shielding materials that shield between the evaluation point I1 and the radiation source J2. The calculation method of the dose rate D in consideration of shielding is described, for example, in the “Radiation Facility Shielding Calculation Practical Manual” (Nuclear Safety Technology Center, June 2001).

  According to the above calculation method, the dose rate D (I1, Jm) from each radiation source J (m) is repeatedly calculated for the evaluation point I1 (S42 to S44). When calculation of the dose rate D (I1, Jm) from all the radiation sources J is completed for the evaluation point I1, the process proceeds to S45.

  In S45, the calculation control unit 22 performs a process of extracting t (three by way of example) radiation sources Jm having a high dose rate D at the evaluation point In. Therefore, three radiation sources J having a high dose rate D (I1, Jm) at the evaluation point I1 are extracted here. Hereinafter, the description will be continued assuming that three radiation sources J1, J19, and J25 are extracted as radiation sources having a high dose rate D at the evaluation point I1.

  When the radiation source J having a high dose rate D is extracted in S45, the process proceeds to S46. In S <b> 46, the dose rate D (In) at the evaluation point I (n) is calculated by the calculation control unit 22. Specifically, the sum of the t dose rates D (In, Jm) extracted in S45 is calculated based on the following equation (2).

D (In) = Σ _t D (In, Jm) (2) formula

  Accordingly, here, the dose rate D (I1) at the evaluation point I1 is calculated as the sum of the dose rates D from the radiation sources J1, J19, and J25 as shown in the following equation (3).

  D (I1) = D (I1, J1) + D (I1, J19) + D (I1, J25) (3)

  When the dose rate D (I1) at the evaluation point I1 is calculated in S46, the process returns to S41, and the second evaluation point I2 is read out. Then, the dose rate D (I2) of the second evaluation point I2 is calculated (S42 to S46).

  Thereafter, the dose rate D (I3) of the third evaluation point I3 and the dose rate D (I4) of the fourth evaluation point I4 are calculated in order, and the calculation of the dose rate D for all the evaluation points In is completed. The dose rate calculation sequence shown in FIG. The processing function performed by the “calculation unit” of the present invention is realized by the processing of S41 to S46 executed by the arithmetic control unit 22.

  And after completion | finish of a dose rate calculation sequence, it returns to S50 of the display flow of FIG. In S50, processing for storing the following data (1) to (3) (hereinafter referred to as display data) obtained in S40 in the RAM 24 is executed.

(1) Direction data from each radiation source Jm at each evaluation point In (2) Dose rate D (In, Jm) data from each radiation source Jm at each evaluation point In (3) Dose rate D at each evaluation point In (In) Data Incidentally, each radiation source Jm indicates the t radiation sources extracted in S45. The dose rate D (In) indicates that calculated in S46.

  In S60 subsequent to S50, the calculation control unit 22 of the computer main body 21 performs a process of displaying the radiation distribution in the storage container 10 on the monitor 35. The method of display is to display the distribution of radiation by moving and displaying particles U imitating radiation in the internal space of the storage container 10 reproduced on the monitor 35.

Hereinafter, the contents of the display process of S60 will be described with reference to FIGS.
As shown in FIG. 8, the display process of S60 includes two processes of S61 and S63. In S <b> 61, a process of sequentially reading out radiation display data (specifically, each data of (1) to (3) described above) from the RAM 24 for each evaluation point In is performed. In subsequent S 63, processing for moving and displaying a plurality of particles U on each evaluation point mesh G that divides the space is performed by the calculation control unit 22 of the computer main body 21 in accordance with the read display data.

  The display rule for each particle U is composed of three rules: the number of particles to be displayed (total number of particles) N, the moving direction of the particles, and the number n of particles having the same moving direction.

(A) The number of particles (total number of particles U) N displayed on the evaluation point mesh G (n) is a number obtained by multiplying the dose rate D (In) by an arbitrary constant P as shown in the following equation (4). To do.
N = D (In) × P (4) N is the number of particles.

(B) The moving direction of the particle U is a direction from the radiation source Jm toward the evaluation point In.
The “ray source Jm” refers to the t radiation sources extracted in S45.

(C) The number n of particles having the same moving direction is expressed by the following equations (5) and (6).
n = N × d (5) Formula d = D (In, Jm) ÷ D (In) (6) Formula D (In) is a dose rate at the evaluation point I (n).
D (In, Jm) is a dose rate from the radiation source Jm at the evaluation point In.

  Next, a display example of the particles U will be described taking the evaluation point mesh G (1) as an example. As described above, since the radiation source Jm having a high dose rate with respect to the evaluation point I1 is “J1”, “J19”, and “J25”, the moving direction of the particle U in the evaluation point mesh is As shown in FIG. 9, there are three directions: a direction L1 from the radiation source J1 toward the evaluation point I1, a direction L19 from the radiation source J19 toward the evaluation point I1, and a direction L25 from the radiation source J25 toward the evaluation point I1.

  The number of particles moving in each direction is set to a number corresponding to the dose rate D (I1, Jm) from each radiation source Jm. Therefore, for example, when the ratio of the dose rate D from each of the radiation sources J1, J19, and J25 to the evaluation point I1 is “2”, “3”, and “1”, it moves in each direction L1, L19, and L25. The ratio of the number of particles is “2”, “3”, “1”.

  In the example of FIG. 9, “two” particles U1 and U2 are moved and displayed in the direction L1 from the radiation source J1 toward the evaluation point I1, and also from the radiation source J19 toward the evaluation point I (1). “One” particle U3 is moved and displayed in the direction L19, and “three” particles U4, U5, and U6 are moved and displayed in the direction J25 from the radiation source J25 toward the evaluation point I (1). The processing function performed by the display control unit of the present invention is realized by the processing of S63 executed by the arithmetic control unit 22.

  Moreover, as shown in FIG. 10, it is preferable to display (repetitively display) the particles U so as to repeat the movement from the boundary surface GA to another boundary surface GB in the evaluation point mesh G. By doing so, continuity is generated in the movement of the particles U between the adjacent evaluation point meshes, and the flow of the movement of the particles U can be given.

  However, if the movement path of the particle U and the generation time of the particle U overlap between the evaluation point meshes G, the movement of the particle U becomes regular and the display becomes unnatural. Therefore, it is preferable to randomly set the generation position (that is, the position of the start point) and the generation timing of the particles U of each evaluation point mesh G by using a random number or the like in the arithmetic control unit 212 of the computer main body 21.

  By preventing the generation position of the particles U and the generation time of the particles U from overlapping between the evaluation point meshes G, the movement of the particles U becomes irregular and the display becomes natural. In addition, the generation | occurrence | production position and generation | occurrence | production time of the particle | grains U should just differ between each evaluation point mesh G. FIG. Therefore, it is not necessary to determine the generation position and generation time using random numbers each time the particle U is repeatedly displayed. Once the generation position and generation time are determined using random numbers for the first time, the determined generation position and generation time are determined. Based on the time, the particles U may be repeatedly displayed at a predetermined repetition period.

    Further, if the moving speed of each particle U is made uniform, the movement of the particle U becomes too regular, which causes unnaturalness. For this reason, if the calculation control unit 22 of the computer main body 21 uses random numbers or the like to vary the moving speed of each particle U, the display becomes easy to see.

  In the present embodiment, in all the evaluation point meshes G (n) that divide the internal space of the storage container 10, as in the evaluation point meshes G (1), according to the display rules (a) to (c) above, A plurality of particles U are repeatedly moved and displayed. In FIG. 11, the particles U are displayed only for two sets of evaluation point meshes G (1) and G (2), but actually, the particles U are also displayed for other evaluation point meshes in the same manner. Will be displayed.

  As described above, in this display method, the number of particles U to be displayed is a number corresponding to the intensity (dose rate) of radiation, and each particle U is moved and displayed in the direction of radiation. Therefore, it can be recognized that a place where the number of displayed particles U is large has a high dose rate D, that is, the intensity of radiation. Further, the direction of the radiation source J can be specified from the moving direction of the particles U. For example, as shown in FIG. 12, if there is a large particle flow in the A direction, it can be recognized that a strong radiation source J exists in the A direction. In FIG. 12, the flow of particles is indicated by arrows, and the size of the flow (number of flowing particles) is indicated by the size of the arrows.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the number N of particles displayed on the evaluation point mesh G (n) is a number proportional to the radiation dose rate D as shown in the equation (4). In the second embodiment, the calculation control unit 22 performs the calculation shown in the following equation (7), and the number N of particles displayed on the evaluation point mesh G (n) is used as an exponential function of the radiation dose rate D (FIG. 13).

N = ^{AD (In)} −1 (7) “N” is the number of particles, and “D (In)” is the dose rate of the evaluation point In. “A” is a constant.

  When the number N of particles to be displayed is an exponential function of the dose rate D, the change in the number N of particles increases with respect to the change in the dose rate D, so that the user can easily recognize the change in the dose rate D from the display on the monitor 35. Become.

  Even when the number N of particles to be displayed is an exponential function of the dose rate D, the moving direction of the particles U is the direction from the radiation source Jm to the evaluation point In and moves in the same direction as in the first embodiment. The number of particles n to be determined is determined based on the above equations (5) and (6).

<Embodiment 3>
Embodiment 3 of the present invention will be described with reference to FIG.
In the third embodiment, a function for changing the size of the particles U is added to the radiation display device 20 of the first or second embodiment.

  More specifically, the radiation display device 20 according to the third embodiment is configured such that the size of the particles U to be displayed on the monitor 35 can be selected and operated through a user interface such as a keyboard 31 and a mouse 33. Here, it is assumed that two patterns of small particles Us and large particles Ub can be selected.

  When the user performs a selection operation (corresponding to the “input operation” in the present invention) of the size of the particles U displayed on the monitor 35 through the user interface such as the keyboard 31 and the mouse 33, the calculation control unit 22 of the computer main body 21 performs the selection operation. First, the process of accepting is performed. Next, the arithmetic control unit 22 of the computer main body 21 changes the size of the particles U displayed on the monitor 35 in accordance with the instruction of the selection operation.

  For example, when the display of the large particle Ub is selected from the state where the small particle Us is initially selected, the arithmetic control unit 22 of the computer main body 21 displays the particle U displayed on the monitor 35 as shown in FIG. Is changed from the small particle Us to the large particle Ub. Note that the size of the particle U is collectively changed for all evaluation point meshes G.

  When the radioactivity is displayed as particles, the visibility of the display varies depending on the size of the monitor 35 and the distance from the monitor 35 even if the size of the particles U is the same. In the present embodiment, there is an advantage that the display can be adjusted by changing the size of the particle U, and the display on the monitor 35 is easy to see.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG.
In Embodiment 3, the example which changes the magnitude | size of the particle | grains U displayed on the monitor 35 in response to the user's selection operation was shown. In the fourth embodiment, the number N of particles displayed on the monitor 35 is changed in response to the user's selection operation. That is, for the number N of particles of each evaluation point mesh G (n) calculated based on the equation (4) of the first embodiment and the equation (7) of the second embodiment, the number N of particles between the evaluation point meshes G The total number of displayed particles is changed without changing the ratio.

  Specifically, the radiation display device 20 according to the fourth embodiment has a configuration in which a pattern with a large number of particles N displayed on the monitor 35 and a pattern with a small number can be selected and operated through a user interface such as a keyboard 31 and a mouse 33. Yes. The number N of particles in a small pattern is the number of particles calculated based on the expression (4) in the first embodiment and the expression (7) in the second embodiment. A pattern with a large number of particles N to be displayed is a small pattern. The number of particles twice the number of particles N is displayed.

  When the user performs a selection operation (corresponding to the “input operation” in the present invention) of the particle number N displayed on the monitor 35 through the user interface such as the keyboard 31 and the mouse 33, the calculation control unit 22 of the computer main body 21 performs the selection operation. First, the process of accepting is performed. Next, the calculation control unit 22 of the computer main body 21 changes the pattern of the number of particles N displayed on the monitor 35 in accordance with the instruction of the selection operation.

  For example, when a pattern with a large number of particles N is selected from a state in which a pattern with a small number of particles N is initially selected, the calculation control unit 22 of the computer main body 21 displays all the evaluation point meshes G as targets. The number of particles N to be changed is doubled.

  In the example of FIG. 15, the evaluation point mesh G <b> 1 on the left side in the drawing has the number N of particles before being changed, so the number N of particles is changed to two. In the example of FIG. 15, the evaluation point mesh G2 on the right side in the drawing has the number N of particles before being changed, and therefore the number N of particles is changed to four. Note that the moving direction of the particles U does not change before and after the change, and is the direction from the radiation source Jm toward the evaluation point In.

  When the radioactivity is displayed as particles, the visibility of the display varies depending on the size of the monitor 35 and the distance from the monitor 35 even if the total number of particles U is the same. In the present embodiment, there is an advantage that the display can be adjusted by changing the number of particles N, and the display on the monitor 35 is easy to see.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the first to third embodiments, an example in which a γ-ray distribution is displayed as an example of radiation has been described. However, an α-ray or β-ray distribution may be displayed.

  (2) In the first to third embodiments, spherical particles are shown as an example of the particles U indicating radiation, but other shapes such as a cube may be used. In addition, the particles may be displayed with a color.

  (3) In the second embodiment, the example in which the number N of particles displayed on the evaluation point mesh G (n) is an exponential function of the radiation dose rate D is shown. The present invention can be applied if the change of N appears more prominently than the proportional relationship. For example, the number N of particles displayed on the evaluation point mesh G (n) is expressed as a quadratic function or a cubic function of the radiation dose rate D. It may be. Further, the radiation dose rate D may be divided into a plurality of regions, and a difference may be made by giving a difference in the display ratio of the number N of particles to the dose rate D between the regions.

  (4) In the third embodiment, an example in which the size of the particles U displayed on the monitor 35 is changed in two large and small patterns by the calculation control unit 22 of the computer main body 21 has been described. In the present invention, the size of the particles U may be changed at a time by each evaluation point mesh G, and may be changed in three patterns such as large, medium, and small or more. In the fourth embodiment, the example in which the number N of particles to be displayed on the monitor 35 is changed between two patterns, that is, a pattern having a large number of particles N to be displayed and a pattern having a small number. In the present invention, the number N of particles may be changed at a time by each evaluation point mesh G, and the number N of particles to be displayed may be changed by three patterns or more.

  (5) In the third embodiment, an example in which the size of the particle U indicating the radiation displayed on the monitor 35 is changed by the arithmetic control unit 22 of the computer main body 21 has been described. In the fourth embodiment, an example in which the number N of particles displayed on the monitor 35 is changed has been described. In addition to changing the size and the number of particles U displayed on the monitor 35, the moving speed of the particles U is collectively changed for each particle U of all the evaluation point meshes G in response to a selection operation from the user. You may do it. In addition, when the moving speed is the same between the particles U, the moving speed of all the particles U is changed in the same manner. When the moving speed is different between the particles U, the ratio of the moving speed is not changed. The moving speed of each particle U may be changed.

DESCRIPTION OF SYMBOLS 10 ... Containment vessel 16 ... Piping used as a radiation source 20 ... Radiation display device 21 ... Computer main body 22 ... Calculation control part (in the "calculation part" and "display control part" of this invention) Equivalent)
35. Monitor (corresponding to “display unit” of the present invention)
G ... Evaluation point mesh (corresponding to "three-dimensional mesh" of the present invention)
U ... Particle

Claims (8)

A radiation display method, wherein particles indicating radiation are moved and displayed in the direction of the radiation in a number corresponding to the intensity of the radiation within each three-dimensional mesh that divides the space.   The radiation display method according to claim 1, wherein the number of particles indicating the radiation is an exponential function of the intensity of the radiation.   The radiation display method according to claim 1 or 2, wherein, in each of the three-dimensional meshes, the generation position and generation time of the particles indicating the radiation are made random.   The at least one of the size, the moving speed, and the number of particles indicating the radiation is collectively changed in each of the three-dimensional meshes in response to an input operation. 4. The method for displaying radiation according to any one of 3 above. The intensity of the radiation at the evaluation point in each three-dimensional mesh that divides the space is on the straight line connecting the radiation of the radiation source, the distance from the radiation source to the evaluation point, and the evaluation point of the three-dimensional mesh. A calculation unit for calculating based on an existing structure;
A display unit;
Radiation comprising: a display control unit that displays, on the display unit, particles indicating the radiation by moving the particles in the three-dimensional mesh according to the intensity of the radiation in the direction of the radiation. Display device.   The radiation display apparatus according to claim 5, wherein the display control unit sets the number of particles indicating the radiation as an exponential function of the intensity of the radiation.   The radiation display device according to claim 5, wherein the display control unit randomizes the generation position and generation time of the particles indicating the radiation in each of the three-dimensional meshes.   In response to an input operation, the display control unit collectively changes at least one of the size, the moving speed, and the number of particles indicating the radiation with the three-dimensional mesh. The radiation display apparatus as described in any one of Claim 5 thru | or 7.

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