JP2000249770A - Ionizing radiation measurement diagram and formation thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a formation method of an ionizing radiation measurement diagram facilitating a visual grasp of a radiation measurement result. SOLUTION: Ionizing radiation generated when X-rays are applied to a water phantom 16b from an X-ray tube bulb 16a is measured, and on the basis of the measured radiation dose, a dose distribution is recorded on an X-ray room interior arrangement chart 13 by using either or both of a bar chart 17 and a radar chart 18. According to the ionizing radiation measurement chart formed in this way, the result of the dose measurement can be visually grasped easily without reading any letter such as a numerical value when the bar chart 17 and/or the radar chart 18 representing the dose distribution are/is observed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing an ionizing radiation measurement chart showing the dose measured at each measurement point in a dose measuring area using a chart, and an ionizing radiation measurement chart for recording the measured dose. About.

[0002]

2. Description of the Related Art Facilities for handling radioactive materials or radiation generators in medical institutions such as hospitals and research institutions such as universities are radiation control areas for reducing radiation exposure of patients, the public and workers. . Measures the dose of ionizing radiation radiated from parts, walls, floors, etc. of each device in the controlled area (area where there is a risk of contamination by radiation and radioactive materials) and reports the measurement result (ionization radiation measurement chart) And so on.

FIG. 2 shows a conventional ionizing radiation measurement chart.
Conventionally, when an ionizing radiation measurement chart is created, the dose of ionizing radiation measured at each measurement point in the dose measuring area is measured, and an X-ray room arrangement diagram 50 as a diagram showing the dose measuring area as shown in FIG. The measured value is recorded as a numerical value 51.

A water phantom 52b as a test body is irradiated with X-rays from an X-ray tube 52a as a radiation generator,
The ionizing radiation generated as a result is reflected on a circle having a radius of 1 m to 2 m around the reference position of the water phantom 52b.
Dosimetry is performed at 0 ° intervals. The dose measured in this manner is, as shown in FIG. 2, a line segment centered on the water phantom 52b is drawn radially at intervals of 30 ° on an arc centered on the water phantom 52b on the X-ray room arrangement drawing 50,
The dose equivalent of ionizing radiation measured in each direction at the intersection of the arc and the line segment is recorded numerically.

In order to indicate the control area on the figure showing the dose measurement area, nodes of the control area are indicated by symbols A, B, C and D, and "ABBCDA" The inside of the wall between them will be the management area. "

[0006]

As described above, in the conventional ionizing radiation measurement chart, the results of the dosimetry are recorded using a diagram showing the dosimetry area, but the information obtained therefrom is mainly composed of characters. Because of this information, it is necessary to browse through the characters from the charts and understand the contents, and it is difficult to fully understand only the visual sense.

Accordingly, an object of the present invention is to provide a method for preparing an ionizing radiation measurement chart and an ionizing radiation measurement chart which enable the results of dose measurement to be easily grasped visually.

[0008]

The method of preparing an ionizing radiation measurement chart according to the present invention is a method of preparing an ionizing radiation measurement chart which records a measured dose on a diagram showing a dose measuring area, and comprises the steps of: Measures ionizing radiation generated by irradiating X-rays from a generator, and records the dose distribution based on the measured dose on a diagram showing the dose measurement area using one or both of a bar graph and a radar chart. It is.

[0009] According to the ionizing radiation measurement chart created by plotting the dose distribution based on the measured dose by a bar graph or radar chart and recording it on a diagram showing the dose measurement area, it is possible to browse through characters such as numerical values. The result of the dose measurement can be easily grasped visually simply by looking at the figure showing the dose distribution. That is,
By using a bar graph or radar chart to show the dose distribution by the length of the bar graph or the position of the node of the radar chart, the dose distribution in the dosimetry area can be easily grasped visually by these lengths and positions Becomes

Here, when the dose distribution is represented by a bar graph, it is desirable that the bar graph be radially spread around the reference position of the test sample. By recording a bar graph that spreads radially around the reference position of the specimen on the figure showing the dosimetry area, the dose distribution in the dosimetry area can be more easily determined based on the positional relationship within the dosimetry area. It becomes possible to grasp.

It is desirable that the recording on the ionizing radiation measurement chart be performed using multiple colors. The measurement results of the control area, operation room, dark room and other spaces (waiting room, corridor, etc.) on the diagram showing the dose measurement area, dose distribution, etc. should be recorded on the ionization radiation measurement chart in different colors using multicolor. This makes it possible to clearly indicate which part to pay attention to when viewing the ionization radiation measurement chart, and prevent an important measurement result from being mistaken or overlooked.

An ionizing radiation measurement chart according to the present invention is an ionizing radiation measurement chart for recording a measured dose on a diagram showing a dose measuring region, and is a shielding member for shielding ionizing radiation going outside the dose measuring region. It is characterized by having a column for recording the dose in the gap.

The entrance to the control area surrounded by the partition is shielded by a shield such as a door or a window so that the ionizing radiation in the control area does not leak outside. Since it is made of lead or the like that does not transmit radiation, it has a considerable weight. In addition, in the case of a shield such as a door, since it is the most movable part, a gap is easily generated between the shield and the partition wall, and the shield is easily damaged.

For this reason, the dose in the gap between the shield and the partition is measured, and the measured dose is recorded in the ionizing radiation measurement chart of the present invention, whereby the degree of the gap between the shield and the partition is determined. Further, the degree of leakage of ionizing radiation can be easily managed, and the dose of the gap between the shields recorded in this manner can be used as a measure for repair and maintenance of the shield.

The ionizing radiation measurement chart of the present invention is an ionizing radiation measurement chart for recording a measured dose on a diagram showing a dose measurement area, and includes a column for displaying a comment on an exposure limit of a human body and a radiation It is provided with one or both of columns for displaying a diagram or a photograph of the generator.

If the dose in the controlled area is measured and the dose distribution in the dose measurement area is recorded on the ionizing radiation measurement chart, the result of the dose measurement tends to be simply grasped and accepted and left as it is. By displaying a comment on the exposure limit of each part of the human body for the measurement conditions, the degree of exposure in the controlled area is notified, and attention is paid to those working in the controlled area. It becomes possible to evoke.

Further, by displaying a diagram or a photograph of the radiation generator, which ionization radiation measurement chart differs for each radiation direction of the radiation generator or the X-rays of this radiation generator is to which device or direction. At a glance.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present embodiment, an example of an ionizing radiation measurement chart for measuring and recording the dose in an X-ray room as a control area in a medical institution handling a radioactive generator will be described. FIG. 1 is a diagram showing an ionizing radiation measurement chart according to the embodiment of the present invention.

The ionizing radiation measurement chart according to the present embodiment includes a measurement condition recording column 1 for recording various measurement conditions such as a measurement place and a measuring device, a measurement result recording column 2 for graphically recording a dose measurement result, and a measurement result recording column. A comment record column 3 for displaying a comment on the result and a measuring device data recording column 4 for recording data relating to the used dosimeter are provided.

The measurement result record column 2 includes a dose recording column 10 for recording the measured dose on the X-ray room layout diagram 13 showing the dose measurement region, and a shielding for shielding ionizing radiation in the dose measurement region. A leak dose recording column 11 for recording the dose in the gap between the entrance door 14 and the partition 15 as a body,
An apparatus record section 12 for recording a specification diagram or a photograph of the radiation generating apparatus provided in the management area is provided.

In the X-ray room arrangement recorded in the dose record section 10, FIG. 13 shows that the control area as the dose measurement area and its peripheral parts (operation room, dark room, etc.) are multicolored based on their actual arrangement. It is drawn and recorded for easy identification. Although not shown, the color of the dark room and the operation room and the color of the management area are recorded using different colors,
In particular, the areas where thorough control of ionizing radiation is required have been clarified.

Further, in the management area of the X-ray room layout diagram 13, figures showing a water phantom 16b as a test body and an X-ray tube 16a as a radiation generator for irradiating the water phantom 16b with X-rays are respectively shown. Is drawn at a position corresponding to the actual arrangement of. Although not shown, the X-ray tube 16a and the water phantom 16b are also recorded using different colors, respectively.
The emission position of X-rays (the position of the X-ray tube 16a) and the reference position of ionizing radiation generated by the X-rays being incident on the specimen (the position of the water phantom 16b) are clear.

The dose equivalent (Sv) as a dose measured using a radiation measuring instrument is recorded as a numerical value 19 on such an X-ray room arrangement diagram 13. This dose equivalent is calculated from the X-ray tube 16a to the water phantom 16b.
A measurement position (distance 100 cm × height 100 cm) centering on this reference position with reference to a predetermined position on the water phantom 16 b
Are measured at predetermined intervals (30 °) on the circumference of the circle.

On each line segment extending radially from the reference position of the water phantom 16b, a dose distribution based on the dose equivalent of ionizing radiation in each direction is graphically recorded by a bar graph 17 and recorded. The bar graph 17 expresses values measured at predetermined intervals on the circumference of the measurement position centered on the reference position of the water phantom 16 as a figure which spreads radially in each direction. Is represented by the length of the bar graph 17.

As described above, by recording the bar graph 17 radiating from the reference position of the water phantom 16b as a test object on the figure showing the dose measurement area, the dose distribution in the dose measurement area is measured. It is possible to easily grasp based on the positional relationship in the area. The bar graph 17 can be formed by a line type or line width other than the thick black line as shown in FIG.

Further, on the X-ray room arrangement diagram 13 in the dose recording column 10, the tip of the bar graph 17 which spreads radially around the reference position of the water phantom 16b is defined as a node, and each node is connected by a line segment. The dose distribution is graphically recorded as a radar chart 18. The bar graph 17 and the radar chart 18 are also not shown, but are recorded by being colored with the brightest color or the like, which is most noticeable, to prevent an important measurement result from being mistaken or overlooked. I have.

As described above, the dose distribution is graphically represented by the bar graph 17 or the radar chart 18 based on the measured dose equivalent, and the X-ray room arrangement diagram 1 showing the dose measurement area.
By recording on FIG. 3, it is possible to visually and easily grasp the dose measurement result only by looking at the length of the bar graph 17 indicating the dose distribution and the position of the node of the radar chart 18 without browsing the characters such as the numerical value 19. It becomes possible. If you want to know the dose distribution accurately, use the bar graph 17
And the numerical value 19 recorded with the radar chart 18
Can be confirmed by

In the leak dose recording column 11, an entrance door 14 as a shield for shielding ionizing radiation going outside the dose measurement area is illustrated, and a dose equivalent (Sv) as a dose in a gap between the entrance door 14 and the partition 15 is shown. ) Is recorded by the numerical value 20. This dose equivalent is shown as a measured value at each position on the left and right and lower boundary portions of the entrance door 14 and the partition wall 15. The measured values can also be shown at the upper boundary, but they are omitted here because the upper part of the entrance door 14 is not directly exposed because it is higher than the human height.

As described above, the dose in the gap between the entrance door 14 and the partition wall 15 is measured, and the measured dose is recorded on a diagram showing the position of each gap, whereby the entrance door 14 and the partition wall 15 can be connected to each other. It is possible to easily manage the extent of the gap between the doors, and thus the degree of leakage of ionizing radiation. it can.

The apparatus record column 12 displays a photograph of the radiation generator installed in the X-ray room. Since ionizing radiation measurement charts exist for different radiation generators or X-ray irradiation directions of the radiation generators, 5-1 to 1 are required for facilities having various types of radiation generators.
There will be about five similar ionizing radiation measurement charts. Therefore, by recording a photograph of the radiation generator in such a device record column 12, it becomes possible to identify at a glance which device or direction the ionization radiation measurement chart is for. In addition, instead of the photograph in the device record column 12, a diagram that allows the user to understand the specifications of the device may be displayed.

The comment record column 3 displays comments on the human body's exposure limit. The comments in this embodiment are the skin dose 31 of each part of the human body to X-rays irradiated by the radiation generator, and the annual skin dose equivalent 32 to the skin dose 31. By referring to the skin dose 31 and the dose equivalent 32, it is possible to easily understand how much X-rays may be received from the radiation generator per year.

In other words, by displaying the comment on the exposure limit of the human body in this way, the degree of exposure in the control area is notified, and the worker working in the control area is alerted to the exposure. It is possible to do.

[0033]

According to the present invention, the following effects can be obtained.

(1) Ionizing radiation generated by irradiating a test body with X-rays from a radiation generator is measured, and based on the measured dose, the dose distribution is graphically represented by a bar graph or a radar chart to show the dose measurement area. By recording above, it is possible to visually and easily grasp the dose measurement result only by looking at the figure showing the dose distribution without browsing characters such as numerical values. That is, according to such a method of preparing an ionizing radiation measurement chart, it is possible to easily grasp the dose distribution in the actual radiation control area as an image.

(2) By recording a bar graph radially extending around the reference position of the test object on the figure showing the dosimetry area, the dose distribution in the dosimetry area is represented by the positional relationship in the dosimetry area. , It is possible to more easily comprehend. As a result, it is possible to easily grasp as an image which position or direction in the actual radiation management area the dose distribution is concentrated.

(3) Since the recording on the ionizing radiation measurement chart is performed using multiple colors, it is possible to clearly indicate which part to pay attention to when viewing the ionization radiation measurement chart. Thus, it is possible to prevent an important measurement result from being mistaken or overlooked. As a result, it is possible to easily and reliably grasp and confirm the measurement results and other information.

(4) By providing a column for recording the dose in the gap of the shield for shielding ionizing radiation going outside the dose measurement area, the degree of the gap between the shield and the partition wall, and furthermore, the degree of radiation leakage can be reduced. The column for recording the dose in the gap between the shields can be easily managed.
It can be used as a guide for repair and maintenance of the shield.

(5) By providing a column for recording a comment on the human body's exposure limit, it is possible to notify the degree of exposure in the control area and call attention to the exposure of those working in the control area. It becomes possible.

(6) By providing a column for displaying a diagram or a photograph of the radiation generator, different ionization radiation measurement charts for each radiation generator or X-ray irradiation direction of this radiation generator can be used for any device or any direction. It is possible to identify at a glance whether or not the object is a thing. That is, it is possible to easily identify similar ionizing radiation measurement charts.

[Brief description of the drawings]

FIG. 1 is a diagram showing an ionizing radiation measurement chart according to an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional ionizing radiation measurement chart.

[Explanation of symbols]

 1 Measurement condition recording column 2 Measurement result recording column 3 Comment recording column 4 Measuring instrument data recording column 10 Dose recording column 11 Leakage dose recording column 12 Device recording column 13 X-ray room layout diagram 14 Entrance door 15 Partition wall 16a X-ray tube 16b Water Phantom 17 Bar graph 18 Radar chart 19,20 Numerical value 31 Skin dose 32 Dose equivalent

Claims (5)

[Claims] 1. A method for preparing an ionizing radiation measurement chart for recording a measured dose on a diagram showing a dose measuring area, wherein ionizing radiation generated by irradiating a test body with X-rays from a radiation generator is measured. A method for preparing an ionizing radiation measurement chart, characterized in that a dose distribution is recorded on the figure using one or both of a bar graph and a radar chart based on the measured dose. 2. The method for preparing an ionizing radiation measurement chart according to claim 1, wherein the bar graph is radially spread around a reference position of the test specimen. 3. The recording on the ionizing radiation measurement chart is performed using multiple colors.
How to create the ionizing radiation measurement chart described. 4. An ionizing radiation measurement chart for recording a measured dose on a diagram showing a dose measuring region, wherein a dose in a gap of a shield that blocks ionizing radiation going outside the dose measuring region is recorded. The ionization radiation measurement chart characterized by having a column. 5. An ionizing radiation measurement chart for recording a measured dose on a diagram showing a dose measuring area, wherein a column for displaying a comment on an exposure limit of a human body and a diagram or a photograph of a radiation generator are displayed. The ionization radiation measurement chart characterized by having one or both of the columns.