JPH0523177U - Radiation detector - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a device that can easily examine the presence of radiation in a sample and the presence of radiation in the environment at a low cost with the same simple operation as taking a picture with a camera. [Structure] A radiation detection window 11 that is permeable to radiation but impermeable to visible light is provided, and portions other than the radiation detection window are impermeable to radiation and visible light of a certain intensity or less. The surface 12 and the dark box 13 are formed. Dark box 1
3, the radiation sensitive film 21 can be mounted and demounted, and a radiation sensitive film mounting / feeding mechanism 22 is provided. A shutter 31 is provided inside the dark box 13 between the radiation detection window 11 and the radiation sensitive film 21 so as to be blocked by the front surface of the radiation sensitive film 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is used in fields in which it is necessary to detect the presence or absence of radiation in a sample and the presence or absence of radiation in an environment where there is a risk of exposure to radiation.

[0002]

[Prior Art]

 Conventionally, an expensive measuring instrument such as a Geiger counter was mainly required to detect the presence or absence of radiation contained in a sample.

A film badge is used to detect the presence or absence of radiation in an environment where there is a risk of being exposed to radiation.

[0004]

[Problems to be solved by the device]

 It was often difficult to operate a device such as the Geiger counter so that a general person other than an expert could easily use it without having knowledge of the operating principle. It was expensive and difficult to use everywhere. In addition, film badges were generally difficult to obtain and were limited to special applications.

The present invention provides an apparatus capable of easily investigating the presence or absence of radiation in a sample and the presence or absence of radiation in the environment with a simple operation and at a low cost.

[0006]

[Means for Solving the Problems]

 In this invention, the radiation detection window 11 which is transparent to the radiation but impermeable to the visible light, and the portions other than the radiation detection window are impermeable to the radiation and the visible ray having a certain intensity or less. A dark box 13 composed of a transparent surface 12, a radiation sensitive film mounting / feeding mechanism 22 for mounting the radiation sensitive film so that the radiation sensitive film 21 is positioned inside the dark box at the radiation detection window, and a radiation sensitive film. The shutter 31, which is positioned so as to block the front of the film, moves to a position where it is not blocked for a preset time and then returns to the original position, the shutter drive mechanism 32 that drives this shutter, and this shutter drive mechanism, It is equipped with a shutter push button 3 3 that gives the operation timing, and can be operated and used with the same ease as if taking a picture with a camera. Developing the Mino radiation sensitive response films, by examining the developed radiation-sensitive film, to investigate whether the radiation specimen, and the presence or absence of radiation environment.

[0007]

[Action]

 When the sample emits radiation, when the emitted radiation reaches the radiation-sensitive film, the radiation-sensitive film is sensitive to the radiation, and when developed, the sensitive area can be distinguished from the insensitive area. There is.

Further, when receiving radiation from the environment, when the received radiation reaches the radiation sensitive film, the radiation sensitive film is sensitive to the radiation, and when developed, the sensitive portion is distinguished from the non-sensitive portion. It has the effect of getting stuck.

[0009]

【Example】

 An embodiment will be described with reference to FIGS. 1 to 4. 1 is an external view, FIG. 2 is a cutaway view of a dark box, FIG. 3 is a rear view, and FIG. 4 is an example of one frame of a radiation sensitive film.

In the embodiment, the radiation detection apparatus has a radiation detection window 11 that is permeable to radiation and impermeable to visible light, and portions other than the radiation detection window have a radiation intensity below a certain intensity. And a dark box 13 composed of a surface 12 that is invisible to visible light.

The rear part 14 of the dark box 13 can be opened and closed like a normal camera, and the radiation sensitive film 21 can be attached and detached. The radiation sensitive film 21 is located inside the dark box 13 at the portion of the radiation detection window 11, and the radiation sensitive film mounting / feeding mechanism 22 is mounted so that the radiation sensitive film 21 can be reliably fed frame by frame. Is provided.

A shutter 31 is provided inside the dark box 13 between the radiation detection window 11 and the radiation sensitive film 21 so as to be blocked by the front surface of the radiation sensitive film 21. The shutter is driven by the shutter drive mechanism 32, moves to a position where the radiation sensitive film 21 is not blocked for a preset time, and then returns to the original position.

On the outside of the dark box 13, a shutter push button 33 is provided which gives an operation timing to the shutter drive mechanism 32 of the shutter 31.

In this embodiment, a setting device 34 for shutter opening time, memo data for identifying a sample, and a display device 35 for setting the set data and operating conditions are provided on the rear surface 14 of the dark box 13. Be done.

It should be noted that, like a normal camera, the shutter is provided with a function such that the same frame of the radiation sensitive film is not given the opportunity to open the shutter more than once.

In addition, the frames of the radiation-sensitive film before and after use are protected from radiation so that the frames of the radiation-sensitive film before and after use are not sensitive to the radiation entering from the radiation detection window when the shutter is opened. To be cut off.

[0017]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. When the sample placed in front of the radiation detection window emits a certain intensity of radiation, the radiation emitted from the sample irradiates the radiation-sensitive film for a preset time. By investigating, it is possible to estimate the presence or absence of radiation emitted by the sample and the intensity of radiation to some extent.

Further, even if the sample placed on the front surface of the radiation detection window emits only weak radiation, the shutter is opened for a long time so that the weak radiation emitted from the sample due to the integration effect is emitted. Can be detected.

Further, when working in an environment where there is a risk of being exposed to radiation, for example, by opening the shutter at the beginning of the work and closing the shutter at the end of the work, the amount of radiation You can see if it was exposed or not. This can provide more detailed data than currently used film badges.

[Brief description of drawings]

FIG. 1 is an outline view of an embodiment of a radiation detection apparatus.

FIG. 2 is a cutaway view of the dark box of the example.

FIG. 3 is a rear view of the embodiment.

FIG. 4 is an example of one frame of the radiation sensitive film used in the examples.

[Explanation of symbols]

 11 Radiation Detection Window 12 Surface Impermeable to Radiation and Visible Light 13 Dark Box 14 Rear Part 21 Radiation Sensitive Film 22 Radiation Sensitive Film Attachment / Feed Mechanism 31 Shutter 32 Shutter Drive Mechanism 33 Shutter Push Button 34 Setting Device 35 Display Device

Claims (2)

[Scope of utility model registration request] 1. A radiation detection window 11 which is permeable to radiation but impermeable to visible light, and portions other than the radiation detection window are impermeable to radiation and visible light having a certain intensity or less. A dark box 13 composed of a surface 12, a radiation sensitive film mounting / feeding mechanism 22 for mounting the radiation sensitive film so that the radiation sensitive film 21 is positioned inside the dark box at the radiation detection window, and a radiation sensitive film The shutter 31, which is located so as to block the front surface of the shutter, moves to a position where it is not blocked for a preset time and returns to the original position, a shutter drive mechanism 32 for driving this shutter, and an operation timing for this shutter drive mechanism. When the sample placed in front of the radiation detection window emits a certain intensity of radiation, provided with a shutter push button 33 to give Alternatively, when receiving a certain amount of radiation from the environment in front of the radiation detection window, the radiation emitted from the sample or environment irradiates the radiation-sensitive film for a preset time, so investigate the irradiated radiation-sensitive film. By this, the presence or absence of radiation emitted by the sample,
Alternatively, a radiation detection device characterized by being able to estimate the presence or absence of radiation received from the environment and the intensity of radiation to some extent. 2. The shutter opening date, closing date, opening time calculated from a built-in clock, shutter setting time, data on the type of film used, and setting data on the sample name are recorded on the same film. The radiation detection device according to claim 1, wherein a device for baking is incorporated into the device to facilitate analysis of the intensity of radiation for each sample later.