JPS6222880Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to electron beam irradiation equipment.

Electron beam irradiation equipment generates X-rays that are harmful to the human body during operation, so it is usually installed on concrete, lead, iron,
Irradiation is performed in an irradiation chamber that is sealed with something like magnetic steel to minimize leakage of X-rays to the outside of the irradiation chamber. In general, X-rays can be attenuated by bending the direction of travel, so in conventional electron beam irradiation equipment, the tunnel-shaped transport path of the irradiated object connected to the irradiation chamber is set in the direction of travel. It is complicatedly bent to provide multiple bending chambers. As a result, the X-rays leaking to the outside are considerably attenuated, but the tunnel-like transport route is bent many times, which complicates the configuration of the transport equipment and makes it difficult to install electron beam irradiation equipment. The problem was that it took up a lot of space.

This idea was made in view of the above-mentioned issues, and includes a bending chamber in the transport path between the irradiation chamber and the outside.
In addition to arranging the entrance and exit in a position that cannot be directly sighted from the transport path connected to the irradiation room,
By installing a plurality of predetermined blades on the wall of the bending chamber that can be directly sighted from both the entrance or exit and the transport path, leakage of X-rays harmful to the human body to the outside can be effectively prevented. This also reduces the number of bends in the transport path of the irradiated object.

Detailed explanation will be given below based on a diagram showing an embodiment of this invention. Reference numeral 1 denotes an electron beam irradiation device, and an irradiation chamber 3 is partitioned by a flexible wall 2 made of concrete or the like.
It is located inside. A bending chamber 4 is connected to the irradiation chamber 3 via a conveyance path 5. 6a and 6b are an input path 7a that is disposed at a position that cannot be directly sighted from the transport path 5 and that is connected to the bending chamber 4.
Alternatively, there is a carry-in port and a carry-out port connected to the carry-out path 7b, and, for example, a linear or strip-shaped object 8 is
It is guided by a conveying device such as a pulley (not shown) into the irradiation chamber 3 through the loading port 6a, loading path 7a, bending chamber 4, and conveying path 5, and is irradiated with a predetermined electron beam by the electron beam irradiation device 1. After receiving it, it is carried out to the outside through the conveyance path 5, the bending chamber 4, the carry-out path 7b, and the carry-out port 6b. Reference numeral 9 denotes a blade for effectively preventing leakage of X-rays to the outside, and a wall surface of the bending chamber 4 that can be directly sighted from the transport path 5 that connects the entrance 6a or the exit 6b and the irradiation chamber 3. 4a, 4b
It is established in In the case shown in FIG. 2, the blades 9 are directly established on the wall surfaces 4a, 4b forming a part of the bending chamber 4, but the blades 9 are installed in parallel on the wall surfaces 4a, 4b. It may be attached to. A suitable material for the blade 9 is a lead plate, which has a great shielding effect. In addition, the ratio of the spacing l ₁ of the blades 9 to the thickness l ₂ of the blades 9 is 10 times or more, and the ratio of the height l ₃ of the blades 9 to the spacing l ₁ of the blades 9 is 1/3 to 3/2. are set respectively. In this way, regulating the spacing l ₁ and the height l ₃ of the blades 9 is effective and economical because the X-rays reflected from the walls 4a and 4b leak from the entrance 6a or the exit 6b. This is to prevent it from coming out. That is, the establishment interval l ₁
This is because if it is less than 10l ₂ , the number increases and the structure becomes complicated, and reflection from the thick portion of the blade 9 also increases, which is undesirable. Also, blade 9
Regarding the tree height _l3 , if it exceeds 3/ _2l1 , the amount of lead used to form the blade 9 will increase accordingly, which is uneconomical, and no further effect can be expected _; This is because if the angle is less than 45 degrees, the reflection angle of the X-rays reflected from the wall surfaces 4a and 4b will be greater than 45 degrees, and reflection toward the entrance 6a or the exit 6b cannot be prevented.

In the above configuration, the object 8 to be irradiated, such as an electric wire, is carried in through the carry-in port 6a, and irradiated while passing through the above-mentioned conveyance path. At this time, the electron beam irradiated from the electron beam irradiation device 1 changes into X-rays when it collides with a gas such as air or a wall surface, but this X-ray is carried from the transport path 5 to a position where it cannot be directly collimated. Port 6a and outlet 6b
are provided, so that there is no leakage directly to the outside, and wall surfaces 4a and 4b that can be directly collimated from both the loading inlet 6a or the unloading outlet 6b of the bending chamber 4 and the conveying path 5.
, a plurality of blades 9 are arranged so that the spacing l ₁ of the blades 9 is at least 10 times the thickness l ₂ of the blades 9, and the height l ₃ of the blades 9 is 1/3 to 3/2 of the spacing l ₁ of the blades 9. Therefore, most of the X-rays a incident between the blades 9 are prevented from being reflected toward the loading port 6a or the loading port 6b, and only a small amount of the X-rays are incident on the portion of the blade 9 having a thickness of l ₂ . What is reflected will only be reflected.

According to actual measurements by the present inventors, l ₁ = 50 mm,
When l ₂ = 2 mm and the tree height of the blade 9 l ₃ = 30 mm, the intensity of the X-rays detected at the entrance 4a or the exit 4b is several tenths of that when the blade 9 is not provided. It was hot.

As detailed above, according to this invention, the loading inlet and the unloading exit are located at positions that cannot be directly sighted from the transport path leading to the irradiation chamber, and both the loading inlet or the unloading exit and the transport path can be directly sighted. Since multiple predetermined blades are installed on the wall of the bending chamber,
Due to the interaction between the blades, X-rays can be efficiently attenuated, and the blades do not pose any problem in conveying a long object to be irradiated, such as a linear or strip-shaped object. Therefore, compared to the conventional case of attenuating X-rays by bending a tunnel-shaped transport path many times, the number of bends in the transport path can be reduced, and the structure of the transport device can be simplified. In addition, it has practical effects such as being able to reduce the space for installing electron beam irradiation equipment.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an example of an electron beam irradiation facility implementing this invention, and FIG. 2 is an enlarged perspective view of an established blade. 3...Irradiation chamber, 4...Bending chamber, 4a, 4b...
Wall surface, 5... Conveyance path, 6a... Loading entrance, 6b...
Export exit, 7a... Input path, 7b... Output path, 9...
…blade.

Claims (1)

[Scope of utility model registration request] An irradiation chamber that irradiates a long object with an electron beam,
A bending chamber connected to the irradiation chamber via a conveyance path, and a loading entrance connected to the carry-in path and the carry-out path, which are arranged in a position that cannot be directly sighted from the conveyance path and are connected to the bending chamber. and a carry-out port, and a plurality of blades established on the wall surface of the bending chamber that can be directly sighted from the carry-in port or the carry-out port and the conveyance path, and the interval between the blades is set at least 10 times the thickness thereof. , and an electron beam irradiation equipment in which the blade height is set to 1/3 to 3/2 of the blade spacing.