JP5978433B1 - Survey meter - Google Patents

Abstract

Provided is a survey meter that can stably hold a shoulder even when a main unit is thinned and lightened. A survey meter includes a substantially box-shaped main body unit and a detection unit for detecting radiation. The survey meter is slid rearward with respect to the main body unit and is moved toward the upper surface of the main body unit. And a detection unit 14 that is attached and detaches from the main unit 12 by sliding forward with respect to the main unit 12. The main body unit 12 includes a front end mounting portion 26 and a side surface mounting portion 24 to which both ends of the shoulder belt 30 are mounted. The front end mounting portion 26 is provided on the front end surface of the peripheral surface of the main body unit 12, and is attached to the side surface. The portion 24 is provided on the side surface of the peripheral surface of the main body unit 12 and substantially at the center in the front-rear direction. [Selection] Figure 7

Description

  The present invention relates to a portable survey meter in which a main unit and a detection unit are separated, and more particularly, to a shoulder belt mounting structure for carrying a survey meter on a shoulder.

  Survey meters are widely used for radiation management. The survey meter is a small portable radiation measuring instrument. Some survey meters, as shown in FIG. 10, include a detection unit 14 for detecting radiation, and a main unit 12 having an arithmetic circuit and a display unit. The detection unit 14 is connected to the main unit 12 by a cable 46. A handle 22 stands from the surface of the main unit 12. The user holds the handle 22 of the main body unit 12 with one hand, holds the detection unit 14 with the other hand, and performs measurement with the detection surface 44 facing the measurement object.

  As described above, in the survey meter in which the main body unit 12 and the detection unit 14 are separated, it is inconvenient if they are separated when stored or simply carried. 12 can be attached. That is, the detection unit 14 can be attached to the main unit 12 by inserting the slider 48 fixed to the detection unit 14 while sliding the slide 48 fixed to the upper surface of the handle 22.

  Conventionally, survey meters often allow a shoulder belt for shoulder straps to be attached to the main unit 12 in order to facilitate carrying. For example, Patent Document 1 discloses a survey meter to which such a shoulder belt can be attached. In the survey meter of Patent Document 1, as shown in FIG. 10, shoulder belt attaching portions 80 and 82 are respectively provided on the front end of the main unit 12 and on the side of the handle 22. The user attaches both ends of the shoulder belt to these two attachment portions 80 and 82, and carries the survey meter with the shoulder belt hung on the shoulder.

JP 2001-004757 A

  Incidentally, in recent years, some studies have been conducted to make the main body unit of the survey meter thinner and lighter. By making the main body unit of the survey meter thinner and lighter, the portability of the survey meter can be further improved. However, when the survey meter body unit is made thinner and lighter, the weight ratio of the detection unit to the entire survey meter increases, and the center of gravity of the survey meter as a whole moves in a direction closer to the detection unit than in the prior art. . In such a survey meter, the case where both ends of the shoulder belt are attached to the front end of the main unit and the side of the handle as in the conventional case will be considered. In this case, when the shoulder belt is put on the shoulder, the detection unit is more easily inclined downward than the main unit. Moreover, the detection unit is normally provided with the holding part 40 and the head part 42 connected with the said holding part 40, as shown in FIG. In the case where the attachment portions 80 and 82 are provided at the same position as that of Patent Document 1, when the shoulder belt is hung on the shoulder, the head portion 42 is easily inclined downward. Here, the detection unit is detached from the handle by sliding the entire unit forward with respect to the handle. If the head portion is tilted downward, the detection unit may slide in a direction to be detached from the handle, and there is a risk that the detection unit may be unintentionally detached or dropped.

  Therefore, an object of the present invention is to provide a survey meter that can stably hold a shoulder even when the main unit is thin and light.

  The survey meter of the present invention is a substantially box-shaped main body unit and a detection unit for detecting radiation, and is mounted on the upper surface side of the main body unit by sliding backward with respect to the main body unit. A detection unit that detaches from the main body unit by sliding forward with respect to the main body unit, wherein the main body unit includes a first attachment portion and a second attachment portion to which both ends of the shoulder belt are attached. And the first mounting portion is provided on a front end surface of the peripheral surface of the main body unit, and the second mounting portion is provided on a side surface of the peripheral surface of the main body unit and substantially in the center in the front-rear direction. It is characterized by that.

In a preferred embodiment, longitudinal position of the front Stories second attachment portion is a near position in the front-rear direction of the center of gravity of the survey meter.

In another preferred aspect, there are a plurality of types of detection units, and the main body unit is mounted with a detection unit that is alternatively selected from a plurality of types of detection units. In another preferred aspect, the detection unit includes a rod-shaped gripping part attached to the main body unit, and a head part that is connected to the front end of the gripping part and is larger than the gripping part. In this case, it is desirable that the position in the width direction of the first attachment portion is closer to the second attachment portion than the grip portion attached to the main body unit.

  In another preferred embodiment, the plate has a substantially rectangular flat plate shape whose thickness is smaller than the length in the front-rear direction and the length in the width direction. In another preferred aspect, the main body unit has a handle that stands from an upper surface thereof, and the detection unit is detachably attached to the handle.

  According to the present invention, the first attachment portion is provided on a front end surface of the peripheral surface of the main body unit, and the second attachment portion is a side surface of the peripheral surface of the main body unit and is substantially in the front-rear direction. It is provided in the center. With this configuration, when the survey unit is held over the shoulder, the survey meter takes a stable posture in which the head unit faces obliquely upward with the main body unit lying on its side facing the user and the detection unit facing outward. . Therefore, the shoulder unit can be stably held even if the main unit is thin and light.

It is a perspective view of the survey meter which is an embodiment of the present invention. It is a perspective view of a main unit. It is a top view of a main body unit. It is a side view of a main unit. It is a perspective view of the detection unit for α / β rays. It is a perspective view of the detection unit for beta rays. It is a figure which shows a mode that the survey meter which mounted | wore the detection unit for (alpha) / (beta) rays is shoulder-held. It is a figure which shows a mode that the survey meter equipped with the detection unit for beta rays is held over the shoulder. It is a figure explaining the positional relationship of the attaching part and center of gravity in the state which fell sideways. It is a perspective view of the conventional survey unit. It is a photograph which shows a mode at the time of attaching a shoulder belt in the same position as a prior art in a thin and light body unit. It is a photograph which shows a mode at the time of attaching a shoulder belt in the same position as a prior art in a thin and light body unit.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a survey meter 10 according to an embodiment of the present invention. 2 is a perspective view of the main unit 12, FIG. 3 is a plan view of the main unit 12, and FIG. 4 is a side view of the main unit. FIG. 5 is a perspective view of the detection unit 14 for α / β rays, and FIG. 6 is a perspective view of the detection unit 14 for β rays.

  The survey meter 10 is a portable radiation measurement device, and is roughly classified into a substantially flat plate-shaped main body unit 12 and a detection unit 14 that can be attached to and detached from the main body unit 12. The main unit 12 and the detection unit 14 are connected by a wired communication method. Of course, instead of the wired communication system, the units 12 and 14 may be connected by a wireless communication system.

  The main unit 12 has a box-shaped case 11. The case 11 has a substantially rectangular shape in which the length in the front-rear direction (Y-axis direction length in the drawing) is longer than the width direction length (length in the X-axis direction in the drawing) in plan view. The thickness of the case 11 (the length in the Z-axis direction in the figure) is sufficiently smaller than the length in the front-rear direction and the length in the width direction, and the case 11 as a whole has a thin flat plate shape.

  On the surface of the case 11, a touch panel monitor 16, operation buttons 18, and a connection unit 20 are provided. The touch panel monitor 16 includes a liquid crystal display and a touch panel (touch sensor), and functions as a user interface that also serves as an input unit and a display unit. The touch panel monitor 16 displays measured values of radiation and the like. In addition, an icon group for instructing various processes is displayed on the touch panel monitor 16, and the measurer may perform various inputs using the icon group.

  The connection unit 20 is a cable jack into which the connector of the cable 46 drawn from the detection unit 14 is inserted. The detection unit 14 and the main unit 12 are connected by inserting the connector of the cable 46 drawn from the detection unit 14 into the cable jack (connection portion 20) of the main unit 12, and the connector is connected to the cable jack (connection portion 20). The connection is canceled by removing it from). In the present embodiment, a plurality of types of detection units 14 are prepared for one main unit 12, and the detection units 14 connected to the main unit 12 can be exchanged as necessary.

  A handle 22 is erected from the upper surface of the case 11. The handle 22 has a bridge shape with one end attached to the vicinity of the rear end of the main unit 12 and the other end attached to a position adjacent to the touch panel monitor 16. The handle 22 is located at the center in the width direction of the main unit 12 and extends in the front-rear direction. During radiation measurement, the user holds the handle 22 with one hand and the detection unit 14 with the other hand, and directs the detection surface 44 of the detection unit 14 toward the measurement target.

  A slide rail 23 is attached to the upper surface of the handle 22. The slider 48 fixed to the detection unit 14 can slide along the slide rail 23. Then, the detection unit 14 is mounted on the main unit 12 by moving the detection unit 14 rearward with respect to the main unit 12 and inserting the slider 48 into the slide rail 23. The slide rail 23 is provided with a stopper (not shown) that prevents the slider 48 from falling backward, thereby preventing the detection unit 14 from falling backward. The detection unit 14 attached to the main unit 12 is detached from the main unit 12 when it is slid forward with respect to the main unit 12.

  On the peripheral surface of the case 11, two pairs of attachment portions 24r and 26r and 24l and 26l are provided. The attachment portions 24r, 26r, 24l, and 26l are portions to which the shoulder belt 30 is attached. In this attachment portion, the attachment portion 24r provided on the right side and the attachment portion 26r provided on the right end of the front end surface make a pair, and the attachment portion 24l provided on the left side and the attachment portion 26l provided on the left end of the front end surface. Make a pair. In the following, if there is no distinction between left and right, the subscripts “r” and “l” are omitted, and simply “side attachment portion 24”, “front end attachment portion 26”, or “attachment portion 24” “attachment”. Part 26 ".

  When carrying the survey meter 10, the user attaches both ends of the shoulder belt 30 to the two attachment portions 24 and 26 that make a pair, and then puts the shoulder belt 30 on the shoulder. The attachment portions 24 and 26 have a substantially U-shaped member protruding from the circumferential surface of the case 11, and a shoulder belt 30 is inserted between the substantially U-shaped member and the circumferential surface of the case 11. A hole is formed. In the present embodiment, the mounting portions 24 and 26 are provided on the side surface and the front end surface of the case 11. The reason for this configuration will be described in detail later.

  The main unit 12 includes a communication unit that receives measurement value data sent from the detection unit 14, a control unit that controls the operation of the main unit 12, a memory that stores measurement value data, and power. A battery to be supplied is built in. The measured value is displayed on the touch panel monitor 16 in a predetermined display format under the control of the control unit. The main unit 12 has a CPU, for example, and the function of the control unit is realized by the CPU executing a program, for example.

  The detection unit 14 is a unit that detects radiation. Inside the detection unit 14, a radiation detector such as a scintillation detector or a GM tube is incorporated. When a scintillation detector is employed, a scintillator for detecting radiation and a photomultiplier tube are built in the detection unit 14. The detection unit 14 includes an amplifier, a waveform shaping circuit, a pulse height discrimination circuit, a counter that counts the number of times of detection of radiation, a calculation unit that calculates a coefficient factor and a dose rate of radiation, and a measurement value that is a result of the calculation. A communication unit for sending the data to the main unit 12 is incorporated. The detection unit 14 includes, for example, a CPU and a memory, and the functions of the counter and the calculation unit are realized by the CPU executing a program, for example.

  In the present embodiment, as the detection unit 14, an α / β ray detection unit 14 shown in FIG. 5 and a β ray detection unit 14 shown in FIG. 6 are prepared. When using the survey meter 10, a detection unit 14 that is alternatively selected from the two types of detection units 14 is connected to the main unit 12.

  Each of the two types of detection units 14 includes a round bar-shaped gripping part 40 and a head part 42 connected to the front end of the gripping part 40. A slider 48 that is slidably inserted into the slide rail 23 described above and an operation button 50 (see FIG. 1) are provided on the peripheral surface of the grip portion 40. Further, a cable 46 for exchanging electrical signals with the main body unit 12 is drawn from the rear end of the grip portion 40.

  The head part 42 is a part that is greatly enlarged compared to the grip part 40. The head portion 42 extends in a substantially rectangular shape in the α / β ray detection unit 14. A substantially rectangular detection surface 44 is provided on the bottom surface of the head portion 42. The head portion 42 of the β-ray detection unit 14 has a substantially truncated cone shape having a larger diameter than the grip portion 40. A substantially circular detection surface 44 is provided on the front end surface of the head portion 42.

  When the detection unit 14 is attached to the main unit 12, as described above, the slider 48 provided in the detection unit 14 is inserted into the slide rail 23 provided in the handle 22 from the front side. The unit 14 is slid backward with respect to the main unit 12. When the detection unit 14 is slid by a certain amount, a part of the slider 48 comes into contact with a stopper provided on the handle 22, whereby the detection unit 14 is stationary at a predetermined position with respect to the main unit 12. Become. In this mounted state, the detection unit 14 is in a state in which the major axis is substantially parallel to the longitudinal axis of the main unit 12 and the head portion 42 faces the front of the main unit 12.

  The weight of the detection unit 14 has a certain amount of weight, although it depends on the type. Therefore, when the detection unit 14 is attached to the handle 22 of the main unit 12, the position in the height direction of the center of gravity G of the survey meter 10 as a whole is near the upper end height of the handle 22, as shown in FIG. Further, the position of the center of gravity G in the front-rear direction is located at the approximate center of the main unit 12 in the front-rear direction (in the middle region when the main unit 12 is divided into three in the front-rear direction).

  Here, the survey meter 10 is a portable radiation measurement device, and the survey meter 10 is often carried with the detection unit 14 mounted on the main unit 12. In order to facilitate carrying of the survey meter 10, it has been conventionally proposed to attach a shoulder belt 30 for shouldering to the survey meter 10, and the shoulder belt 30 is also provided in this embodiment.

  However, in the case of the survey meter 10 in which the main body unit 12 is reduced in weight and thickness and the weight ratio of the detection unit 14 to the main body unit 12 is increased as in the present embodiment, if the attachment position of the shoulder belt 30 is not sufficiently considered, There was a problem that the survey meter 10 could not be held stably over the shoulder. This will be described using the prior art as an example. In the following description, in order to facilitate understanding of the direction, the width direction of the survey meter 10 is referred to as the X direction, the front-rear direction is referred to as the Y direction, and the thickness direction is referred to as the Z direction. Is called the A direction, the front-rear direction is called the B direction, and the height direction is called the C direction.

  FIG. 10 is a schematic perspective view of a conventional survey meter 10. As shown in FIG. 10, the main body unit 12 of the conventional survey meter 10 is thicker and heavier than the main body unit 12 of the survey meter 10 of this embodiment. In this case, the center of gravity G of the survey meter 10 with the detection unit 14 attached to the main unit 12 is the X-direction center of the main unit 12, slightly forward from the Y-direction center, and slightly from the Z-direction center. The position near the detection unit 14, that is, near the intersection of the axis S1 and the axis S2 in FIG.

  In order to hold the survey meter 10 over the shoulder, in the prior art, a front mounting portion 80 is provided at the right end of the front end surface of the main unit 12, and a rear mounting portion 82 is provided at the rear end of the left side surface of the handle 22. . The survey meter 10 is held over the shoulder by attaching both ends of the shoulder belt 30 to the two attachment portions 80 and 82 and then hanging the shoulder belt 30 on the shoulder. Conventionally, when this shoulder holding is performed, the survey meter 10 is held in an upright posture in which the main unit 12 is located below and the detection unit 14 is located above. In this case, the center of gravity of the survey meter 10 is located on the lower side in the A direction (lower side in the vertical direction) than the mounting portions 80 and 82 that are the support points of the survey meter 10. Thus, since the center of gravity is below the support point in the vertical direction, when the main unit 12 is thick and heavy, the survey meter 10 is stably held over the shoulder in an upright posture.

  However, the positions of the mounting portions 80 and 82 have some problems when the main body unit 12 is thinned and lightened and the position of the center of gravity moves largely toward the detection unit 14. This will be described with reference to FIGS. 11 and 12 show a state in which the shoulder belt 30 is attached to the same position (the right end of the front end face of the main unit 12 and the rear end of the left side face of the handle 22) in the thin and light main body unit 12 as in the prior art. It is a photograph.

  When the main body unit 12 is thinned and lightened, the center of gravity G of the survey meter 10 as a whole is located on the detection unit 14 side substantially more than the front side mounting part 80 and at the same height as the rear side mounting part 82. become. In this case, if the survey meter 10 is to be held over the shoulder in an upright position, the center of gravity G (near the handle 22) of the survey meter 10 is positioned above the mounting portions 80 and 82 that are the support points of the survey meter 10 in the vertical direction. , It becomes unstable. As a result, the survey meter 10 is tilted about the B-direction axis so that the center of gravity is below the support point (attachment portion), and as shown in FIG. It tends to be on its side. Furthermore, if the shoulder is held for a long time in the posture of FIG. 11, the survey meter 10 rotates around the Z-axis (horizontal axis in the lying-down posture) due to the weight of the head portion 42, and the detection unit 14 is in the obliquely downward posture. Cheap. In this case, the detection unit 14 may slide in the direction of detachment from the handle 22 due to its own weight, contrary to the user's intention.

  Here, as shown in FIG. 12, the shoulder belt 30 extending from the rear attachment portion 82 in the state where the detection unit 14 of the survey meter 10 is in the upright posture where the detection unit 14 is located on the upper side and the main body unit 12 is located on the lower side is attached to the detection unit. It is also conceivable to be hooked on the 14 gripping portions 40. With this configuration, it is possible to prevent the survey meter 10 from tilting around the B-direction axis. As a result, it is possible to prevent the head part 42 from being directed downward unintentionally. However, in order to prevent the survey meter 10 from tilting, the position of the shoulder belt 30 must be confirmed and adjusted at any time so as to maintain the state in which the shoulder belt 30 is caught by the grip portion 40. Such confirmation / adjustment of the shoulder belt 30 is troublesome for the user. In the state of FIG. 12, the shoulder belt 30 hits the gripping portion 40, and the gripping portion 40 is always loaded in the X direction, which may cause deterioration of the slider 48, the rail, and the gripping portion 40. It was.

  That is, when the main unit 12 is thin and lightweight, the survey meter 10 cannot be stably held over the shoulder even if the attachment portion is provided at the same position as the conventional one. Therefore, in the present embodiment, the mounting portions 24 and 26 are provided on the front end surface and the side surface of the main unit 12 so that the main unit 12 can be stably held even when the main unit 12 is thin and light. I will explain this in detail.

  In the present embodiment, as described above, two pairs of attachment portions 24r, 26l and 24l, 26l are provided. Since the configuration and effect of the two pairs of mounting portions 24r, 26r and 24l, 26l are substantially the same, the configuration and effect of the mounting portion 24r on the right side surface and the mounting portion 26r on the right end of the front end surface will be described below. In the following description, the right side mounting portion is referred to as a “side surface mounting portion”, and the right end mounting portion is referred to as a “front end mounting portion”.

  The front end attachment portion 26 is provided at a position closer to the pair of side surface attachment portions 24 than the handle 22 in the front end surface of the main unit 12. The side surface mounting portion 24 is provided at the approximate center in the Y direction on the right side surface of the main unit 12. Here, “substantially in the center in the Y direction” refers to the middle range of the main unit 12 divided into three in the Y direction. The approximate center in the Y direction is the vicinity of the position of the center of gravity G of the survey meter 10 in the Y direction. That is, in the present embodiment, the position in the Y direction of the side surface mounting portion 24 is near the position in the Y direction of the center of gravity G of the survey meter 10.

  A case where both ends of the shoulder belt 30 are attached to the side surface attaching portion 24 and the front end attaching portion 26 and the shoulder belt 30 is hung on the shoulder will be described with reference to FIGS. 7 and 8 are views showing a state when the survey meter 10 is held over the shoulder. FIG. 9 is a diagram showing the positional relationship between the center of gravity of the survey meter 10 in the lying state and the mounting portions 24 and 26.

  In this embodiment, the C direction position of the center of gravity G of the survey meter 10 is higher than the C direction positions of the two attachment portions. Therefore, in this embodiment as well, it is difficult to hold the survey meter 10 in an upright posture in which the detection unit 14 is up and the main unit 12 is down. As in the case of FIG. On the body side, the posture is such that the detection unit 14 faces outward. Consider the positional relationship between the support points (mounting portions 24, 26) and the center of gravity G when this sideways posture is assumed. As shown in FIG. 9, the center of gravity G is located almost directly below the side surface mounting portion 24 when the erect posture is changed to the sideways posture. In this case, the center of gravity G tends to move between the two support points (mounting portions 24 and 26) in order to be more stable. As a result, the survey meter 10 rotates around the Z direction axis in a direction approaching downward (R direction in FIG. 9). Finally, as shown in FIGS. 7 and 8, the head portion 42 is stabilized in a posture that faces obliquely upward. If it will be in this state, since the detection unit 14 does not have to worry about falling out of the slider 48, the user can carry the survey meter 10 in comfort. Further, since the shoulder belt 30 is not caught on the detection unit 14, an unnecessary load is not applied to the detection unit 14, and deterioration of the slider 48, the slide rail 23, and the grip portion 40 can be effectively prevented.

  Next, variations in the positions of the attachment portions 24 and 26 will be examined. First, the reason why the side surface mounting portion 24 is provided substantially in the center in the front-rear direction (Y direction) will be examined. As described above, in the present embodiment, when the survey meter 10 is in the sideways posture, the center of gravity G is inclined to be positioned between the two mounting portions 24 and 26, so that the head portion 42 is inclined upward. Take a stable posture facing you. When the side surface mounting portion 24 is provided in the vicinity of the rear end portion, at the position P1 in FIG. 9, the center of gravity G is located between the two mounting portions 24 and 26 when the sideways posture is reached. It becomes difficult for the part 42 to face diagonally upward. In this case, there is a possibility that the head portion 42 may face downward due to a slight trigger (for example, when it hits a person while holding the survey meter 10 over the shoulder). Therefore, it can be said that it is not desirable to provide the side surface mounting portion 24 at a position near the rear end of the side surface.

  Next, consider a case where the side surface mounting portion 24 is provided near the front end, for example, at a position P2 in FIG. In this case, after the survey meter 10 is in the sideways posture, the head portion 42 rotates in an upward direction so as to be positioned between the two attachment portions 24 and 26. That is, when the side surface mounting portion 24 is provided in the vicinity of the front end, the head portion 42 can easily take a posture in which the head portion 42 faces obliquely upward, as in the case where the side surface mounting portion 24 is provided in the front-rear direction center. However, in this case, since the distance L1 between the two attachment portions 24 and 26 (support points) becomes small, the state becomes close to one-point support, and rotation around the attachment portions 24 and 26 is likely to occur.

  That is, when the side surface attaching portion 24 is provided near the rear end (position away from the front end attaching portion 26), it becomes difficult to take a stable posture in relation to the center of gravity G, and the side attaching portion 24 is located near the front end (position close to the front end attaching portion 26). ), The rotation tends to occur due to the relationship with the front end mounting portion 26. From the above, it can be said that the side surface mounting portion 24 is preferably substantially in the center in the front-rear direction of the main unit 12. Originally, it is most desirable that the position of the side surface mounting portion 24 is the front-rear direction position of the center of gravity G of the survey meter 10. However, in the present embodiment, the detection unit 14 attached to the main unit 12 can be appropriately replaced, and the position of the center of gravity G of the survey meter 10 changes depending on the detection unit 14 attached. Therefore, it is difficult to always match the position in the front-rear direction of the side surface mounting portion 24 with the position in the front-rear direction of the center of gravity G of the survey meter 10. In consideration of such circumstances, it can be said that the side surface attaching portion 24 is sufficient if it is approximately the center in the front-rear direction on the side surface of the main unit 12.

  Next, the position of the front end mounting portion 26 will be examined. Consider a case where the front end mounting portion 26 is provided at a position away from the side surface mounting portion 24, for example, at a position P3 or a position P4 in FIG. In this case, since the distance L1 with the side surface mounting portion 24 is increased, there is an advantage that rotation around the mounting portion is difficult to occur, while the shoulder belt 30 extending from the front end mounting portion 26 easily interferes with the head portion 42. The problem arises. Such a problem can be solved if the shoulder belt 30 is routed so as to pass between the head portion 42 and the main unit 12, so that the installation at the position P <b> 3 or the position P <b> 4 is not completely excluded. However, since it is troublesome for the user to separately handle the shoulder belt 30, the front end mounting portion 26 is at least in a position closer to the side surface mounting portion 24 than the handle 22 in the width direction of the front end surface. It can be said that it is desirable to provide it.

  The configuration described so far is merely an example, and other configurations can be used as long as the attachment portions 24 and 26 of the shoulder belt 30 are provided on the front end surface of the main unit 12 and the substantially center of the side surface in the front-rear direction. May be changed as appropriate. For example, in this embodiment, a handle 22 is provided on the main unit 12, and the detection unit 14 is attached to the handle 22. However, such a handle 22 may be omitted, and the detection unit 14 may be directly mounted on the surface of the main unit 12. In this embodiment, the detection unit 14 can be replaced. However, the number of the detection units 14 corresponding to one main body unit 12 may be one (not replaceable). Moreover, in this embodiment, although two pairs of the side surface attaching part 24 and the front-end attaching part 26 are provided, this may be only a pair. Further, the shapes and the like of the main body unit 12 and the detection unit 14 exemplified in the present specification are all examples, and may be appropriately changed to different shapes.

DESCRIPTION OF SYMBOLS 10 Survey meter, 11 Case, 12 Main body unit, 14 Detection unit, 16 Touch panel monitor, 18 Operation button, 20 Connection part, 22 Handle, 23 Slide rail, 24 Side attachment part, 26 Front end attachment part, 30 Shoulder belt, 40 Grip part 42 Head part 44 Detection surface 46 Cable 48 Slider 50 Operation button 80 Front mounting part 82 Rear mounting part G Center of gravity.

Claims (7)

A substantially box-shaped main unit;
A detection unit for detecting radiation, which is mounted on the upper surface side of the main unit by sliding backward with respect to the main unit and from the main unit by sliding forward with respect to the main unit. A detection unit to leave,
A survey meter comprising:
The body unit has a first attachment portion and a second attachment portion to which both ends of the shoulder belt are attached,
The first mounting portion is provided on a front end surface of the peripheral surface of the main unit,
The second attachment portion is provided on the side surface of the main body unit, and in the approximate center in the front-rear direction.
A portable survey meter. The survey meter according to claim 1 ,
The survey meter according to claim 1, wherein the position of the second mounting portion in the front-rear direction is near the position of the center of gravity of the survey meter in the front-rear direction. The survey meter according to claim 1 or 2 ,
The detection unit has a plurality of types,
The main body unit is mounted with a detection unit that is alternatively selected from a plurality of types of detection units.
Survey meter characterized by that. The survey meter according to any one of claims 1 to 3 ,
The detection unit is
A rod-shaped gripping part attached to the main unit;
A head part connected to the front end of the gripping part and enlarged than the gripping part;
The survey meter characterized by comprising. The survey meter according to claim 4 ,
The survey meter according to claim 1, wherein a position in the width direction of the first attachment portion is closer to the second attachment portion than a grip portion of the detection unit attached to the main body unit. The survey meter according to any one of claims 1 to 5,
The main body unit has a substantially rectangular flat plate shape whose thickness is smaller than the length in the front-rear direction and the length in the width direction. The survey meter according to any one of claims 1 to 6,
The main body unit has a handle that is erected from the upper surface thereof.
The detection unit is detachably attached to the handle.
Survey meter characterized by that.