JPS5923297A - Method of reinforcing radiation resistance of equipment with electric circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for enhancing the radiation resistance of equipment having electrical circuits.

Conventionally, methods for strengthening the radiation resistance of equipment used in nuclear power plants, etc. that make electrical circuits, include replacing radiation-sensitive parts with radiation-resistant parts in the design, and another method. The method used was to apply radiation shielding to the entire device, including both parts that are sensitive to radiation and parts that are strong.The former requires new development for some parts, and even for parts that have already been developed. It is more expensive than general-use products, and the equipment that uses it also has the problem of being expensive. In addition, since the latter shields the entire device, the shielding strength I becomes large, which may cause various problems in terms of construction and dimensions.

An object of the present invention is to provide a method for enhancing radiation resistance at a relatively low cost, allowing the use of conventionally used radiation-sensitive parts as is.

A feature of the present invention is that among the components constituting the device, at least a portion of the electric circuit, such as MO8 type transistors with poor radiation resistance, LSI components, etc., and by changing the amplification potential, The purpose is to apply radiation A to a part of the equipment, including parts such as transistors, which are used in areas that may interfere with the functionality of the equipment.

The number of parts that need to be shielded is generally smaller than the parts of the entire device, and the number of shielding members can also be reduced, and the device itself can be designed to be relatively compact.

A practical example of the invention described in F below will be explained using the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to the design of an ITV system for a nuclear power plant or the like. Usually, the camera body 1o attached to the camera pan head 20 may include drowsy parts with poor radiation resistance. In such a case, remove only the electrical component or the entire board containing the drowsy component from the camera body io, install it in a separately provided radiation shielding box 30, and connect it with the connection cable 15 between them. The ITV system has a similar configuration. As a result, there is no need to provide radiation shielding to the camera body attached to the pan head, and the weight of the camera unit 10 attached to the pan head 20 can be kept within a weight that can be sufficiently driven by a general pan head.

Further, FIG. 2 shows an embodiment of the radiation shielding box 30 shown in FIG. 1. A printed circuit board 31 on which parts requiring radiation shielding are attached is attached to a lower box 32 made of a shielding material with screws 34. In addition, the input/output lead wires of the board 31 are connected to the connector 36 through the holes 35 provided for the lead wires in the lower 4M box 32.1.9 What angle does the cocoon effect affect the incident radiation? 74t, the power to design the board 31 to be the same; good. In addition, the upper shielding box 33 is attached to the F-side shielding box 32 by lifting the lid, and the board 3
It has a structure that completely masks 1. Up! 1Ill box 33 and lower box 32 have mounting bolts 37
It is fixed at l. The mounting bolt 37 may also be made of the same IA material as the J1llf material, and -C may also be used. Also, bottom +l1lI
A member 3811-j' extending 1 inch Ecl, -i to the box 32 is added to keep the shape of the entire box in check, and does not need to be a shield.

Further, the radiation shielding box 3o may be stored inside or outside the camera body 1o of FIG. 1 in a stand which may be relatively small.

Also, lengthen the connection cable shown in Figure 5, 111, and move the shielding box 30 away from the location where the camera body 10 is installed to a location with as little radiation as possible. ＜You may do so.

Furthermore, if necessary, a relay station may be provided in the middle of the connection cable 15 shown in FIG. 1 to amplify the signal level and correct signal distortion in order to prevent the signal level from decreasing. Furthermore, at this time, if necessary, a method may be used in which a necessary part of the relay station is housed in a radiation shielding box.

FIG. 3 shows an embodiment in which a portion of the drowsy component mounted on the board 40 is guided into the shielding box. If an IC 45 that is sensitive to radiation is installed on the board 40 of a device that has been designed and manufactured without considering radiation resistance at all, the IC 4
A relay socket 42 is inserted into the socket 41 of No. 5, and the middle 1st player socket 42 is connected via a cable 44 to a relay socket 43 on the side into which the IC is inserted. An IC 45 inserted into the socket 41 on the board is inserted into the relay socket 43. This IC 45 part is placed in a shielding box 3 in FIG. 1 or 2 separately from the substrate 40.
In addition, if necessary, the relay sockets 42 and 43 are equipped with a function to compensate for the decrease in the input/output signal level and transmission speed of the IC 45 using the relay cable 44. You can have it.

Also, inside? (Conventional sockets may be equipped with optical fiber conversion, and optical fiber cables may be used as relay cables.

Also, there are relatively many parts of the board 40 that require shielding! In the case of M, you can take out the clearing 40 from another board and apply the cutting process. In other words, it is not necessary to ensure that the circuit boards housed in the temporary shielding box do not necessarily include components that must be shielded.

This method eliminates the need to redesign conventional circuits.
Radiation resistance can be strengthened without any damage.

If it is necessary to cool the inside of the shielding box, use bamboo cooling, low-filling liquid cooling, or external cooling.
IF,
Alternatively, cooling may be performed using a combination of V and some of these.

The chip inside the C45 is radiated inside the '45, #
An aging method may also be used.

As previously mentioned, the present invention allows the conventional radiation-sensitive parts to be used as they are, and the radiation resistance can be increased at a relatively low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of ITV in a nuclear power plant or the like using the present invention, and FIG. 2 is an explanation of the row of radiation shielding boxes in the row of FIG. 1. FIG. 3 shows a detailed illustration of the present invention for enhancing the radioactivity of components on a substrate. 10... TV camera, 20... Pan head, 30... Radiation shielding box, 5... Monitor, 31... Printed circuit board with radiation-sensitive parts on it, 33. 32... Sheet radiation m shielding box, 40... general printed circuit board, 4
1...IC socket, 45...IC that is sensitive to radiation, 4
2゜Deaf 1st Ward 2nd map

Claims (1)

[Claims] 1. In a method for enhancing the radiation resistance of equipment having an electric circuit used in an atmosphere exposed to radiation such as a nuclear power plant, the equipment having an electric circuit is characterized in that at least a portion of the electric circuit is shielded from radiation. Radiation resistance enhancement method.