JP2010230429A - Radiation detector - Google Patents

Abstract

A temperature distribution is prevented from being formed in a storage chamber that stores a heat generating portion.
Air from a fan is sent to a power circuit board, a control unit, an A / D converter, and a signal processing board. When the air that has passed through the power circuit board 128, the control unit 129, the A / D converter 124, and the signal processing board 122 reaches the inner wall 112A, it hits the inner wall 112A and then separates toward the inner walls 112B and 112D on both sides. Return to the inner wall 112C along the inner walls 112B and 112D. As described above, the air circulates in the second chamber 112 in two rings in a plan view. As described above, by circulating the air, the temperature in the second chamber 112 is made uniform, and the formation of a temperature distribution in the second chamber 112 can be suppressed.
[Selection] Figure 1

Description

  The present invention relates to a radiation detection apparatus that detects radiation.

  As a radiation detection apparatus, the radiation detection apparatus disclosed in Patent Document 1 is known. The radiation detection apparatus disclosed in Patent Document 1 is intended to efficiently dissipate heat generated from an IC or the like mainly composed of a bipolar transistor, which is indispensable for processing a large amount of pixel information at high speed. It is configured.

  That is, in the radiation detection apparatus of Patent Document 1, a photoelectric conversion apparatus 100 having a plurality of pixels arranged two-dimensionally, and a flexible circuit in which an integrated circuit (processing IC) 403 for processing an electric signal from the photoelectric conversion apparatus 100 is arranged. A housing (external chassis) 101 having the cable 404, the photoelectric conversion device 100, and the integrated circuit 403 therein is provided, and the flexible cable 404 is fixed to the housing 101. The housing 101 is configured to hold the photoelectric conversion device 100.

JP 2006-215028 A

  However, although the structure of patent document 1 is a structure which cools a local high temperature part, although partial absolute temperature can be lowered | hung, temperature distribution will be formed in a housing | casing. If the temperature distribution is formed in the housing, there may be a problem in the influence on the TFT characteristic distribution or the durability of the adhesion surface to which the scintillator is attached.

  In view of the above facts, an object of the present invention is to provide a radiation detection apparatus that can suppress the formation of a temperature distribution in a housing chamber that houses a heat generating portion.

  A radiation detection apparatus according to claim 1 of the present invention includes a radiation detection unit that detects radiation, a heat generation unit that includes a signal processing unit that processes a signal from the radiation detection unit, and a housing that houses the heat generation unit therein. A housing having a chamber and made of a heat conductor; a heat dissipating member that is provided in the heat generating portion, dissipates heat of the heat generating portion into the housing chamber, and does not contact the inner wall of the housing chamber; and the housing chamber And circulating means for circulating the gas in the storage chamber and blowing the gas to the heat radiating member.

  According to this configuration, the radiation detection unit detects radiation, and the signal processing unit processes a signal from the radiation detection unit.

  Here, in the configuration of the first aspect of the present invention, the heat generating unit including the signal processing unit generates heat in the accommodating chamber, but the gas circulates in the accommodating chamber by the circulation means. For this reason, the temperature in the storage chamber is made uniform, and the temperature distribution can be prevented from being formed in the storage chamber. Moreover, the heat in the storage chamber is released to the outside through a housing made of a heat conductor.

  Further, according to the configuration of claim 1, since the heat dissipating member provided in the heat generating portion does not contact the inner wall of the storage chamber, the heat generated does not transfer to the radiation detecting portion via the housing, Moreover, there is no possibility that the heat of the housing in the vicinity of the contact will rise and contact the subject. Furthermore, the gas blown from the circulation means can be efficiently stored by increasing the temperature difference between the temperature of the heat dissipation part and the circulated gas and increasing the heat dissipation efficiency compared to when the heat dissipation member contacts the inner wall of the storage chamber. Make room temperature uniform.

The radiation detection apparatus according to claim 2 of the present invention is the radiation detection apparatus according to claim 1, wherein the heat generating portion is disposed on one side of the opposed inner walls of the storage chamber,
The circulation means is disposed on the other side of the opposing inner walls of the storage chamber, and blows the gas to the heat generating portion.

  According to this configuration, since the distance between the heat generating unit and the circulation unit can be increased, the gas not heated by the heat generating unit can be blown from the circulation unit to the heat generating unit, and the effect of absorbing heat from the heat generating unit is enhanced.

In the radiation detection apparatus according to claim 3 of the present invention, in the configuration of claim 1 or claim 2, the storage chamber is formed in a flat shape having a spread in a plane direction orthogonal to the thickness direction,
The circulating means sucks the gas in the thickness direction, discharges the gas in the planar direction, and circulates the gas along an inner wall extending in the planar direction.

  According to this configuration, since the inner wall along the planar direction has a larger area than the inner wall along the thickness direction, heat is radiated from the housing chamber to the outside by circulating gas along the inner wall along the planar direction. This increases the effect of reducing the overall temperature of the accommodation chamber.

  A radiation detection apparatus according to a fourth aspect of the present invention is the configuration according to any one of the first to third aspects, further comprising a guide for guiding the gas in the direction in which the gas from the circulation means circulates.

  According to this configuration, since the guide guides the gas in the direction in which the gas from the circulation means circulates, the gas circulation efficiency is increased and the temperature in the housing can be made uniform.

  In the radiation detection apparatus according to claim 5 of the present invention, in the configuration of any one of claims 1 to 4, a concave portion or a convex portion for expanding the surface area is formed on the outer surface of the housing. .

  According to this configuration, since the surface area of the outer surface of the housing is enlarged by the recesses or protrusions formed on the outer surface of the housing, the effect of radiating heat from the housing chamber to the outside is increased, and the overall temperature in the housing chamber is increased. Can be lowered.

  A radiation detection apparatus according to a sixth aspect of the present invention is the radiation detection apparatus according to any one of the first to fifth aspects, wherein a plurality of the heat generating units are arranged in the accommodating chamber and transmit / receive signals to / from a power source and the outside Any one of the above.

  According to this configuration, although the plurality of heat generating portions generate heat, the temperature in the housing is made uniform, and it is possible to suppress the formation of a temperature distribution in the housing.

  Since this invention was set as the said structure, it can suppress that temperature distribution is formed in the storage chamber which accommodates a heat-emitting part.

FIG. 1 is a schematic view showing the configuration of the radiation detection apparatus according to the present embodiment, (A) is a plan view showing the radiation detection apparatus in a partial cross section, and (B) is a partial cross section of the radiation detection apparatus. It is a side view shown by. FIG. 2 is a schematic diagram illustrating an example in which a part of the heat generating portion is disposed outside the housing. FIG. 3 is a schematic view showing a configuration in which a guide is provided. FIG. 4 is a schematic diagram showing a configuration in which the fan is arranged in the center of the second chamber. FIG. 5 is a schematic view showing a configuration in which the fans are arranged at the corners of the second chamber. FIG. 6 is a schematic diagram showing a configuration in which an opening is formed in the housing. FIG. 7 is a schematic view showing a configuration in which convex portions for expanding the surface area are formed on the outer surface of the housing. FIG. 8 is a schematic view showing a configuration in which a recess for enlarging the surface area is formed on the outer surface of the housing. FIG. 9 is a schematic view showing a configuration in which a guide for dividing the second chamber in the thickness direction is provided, (A) is a plan view showing the radiation detection device in a partial cross section, and (B) is a radiation detection. It is a side view which shows an apparatus with a partial cross section. 10 is a schematic diagram showing a configuration in which the guide shown in FIG. 9 and the guide shown in FIG. 3 are combined.

Below, an example of an embodiment concerning the present invention is described based on a drawing.
(Configuration of radiation detection apparatus according to the present embodiment)
First, the configuration of the radiation detection apparatus according to the present embodiment will be described. FIG. 1 is a schematic diagram illustrating a configuration of a radiation detection apparatus according to the present embodiment.

  As shown in FIGS. 1A and 1B, the radiation detection apparatus 100 includes a housing 102 that houses each component. A partition wall 104 that partitions the space in the housing 102 is provided in the housing 102. The casing 102 and the partition wall 104 are made of a heat conductor that conducts heat, and are formed of, for example, a member mainly composed of SUS (stainless steel), aluminum, magnesium, iron, carbon, or the like. The inside of the housing 102 is divided into two spaces, a first chamber 111 and a second chamber 112 as an example of a storage chamber that stores a heat generating unit described later.

  The first chamber 111 houses a radiation detection unit 200 that detects radiation. The internal space of the second chamber 112 and the internal space of the first chamber 111 are separated.

The radiation detection unit 200 accommodated in the first chamber 111 is irradiated with radiation from the side opposite to the side where the second chamber 112 is present. Various types of radiation detection unit 200 are used.
For example, from the aspect of the charge generation process that converts radiation (X-rays) into charges, the charges generated in the photoconductive layer when X-rays are incident are collected by the charge collecting electrode and temporarily accumulated. The direct conversion type detection unit that is read out as an electrical signal and the charge obtained by detecting the fluorescence emitted from the phosphor (scintillator) by irradiation with a photoelectric conversion element by irradiating with radiation is temporarily accumulated, and the accumulated charge is electrically There are indirect conversion type detection units that are read out as signals. From the aspect of the charge reading process for reading out the accumulated charge to the outside, scanning driving is applied to a light reading type reading by irradiating reading light (electromagnetic wave for reading) and a TFT (thin film transistor) connected to the power storage unit. There is a TFT reading type that reads out by reading.

  The second chamber 112 is formed in a flat shape (specifically, a rectangular parallelepiped thinned in the thickness direction) having a spread in a plane direction perpendicular to the thickness direction. Further, the second chamber 112 has a four-sided shape, specifically a rectangular shape, surrounded by four sides in plan view. Similarly to the first chamber 111, the second chamber 112 is also sealed from the outside. Note that the second chamber 112 may be configured not to be sealed from the outside (see FIG. 6).

  The second chamber 112 accommodates a signal processing board 122 as an example of a signal processing unit that processes an electrical signal from the radiation detection unit 200. The signal processing board 122 is electrically connected to the radiation detection unit 200 through a data wiring (not shown), and the charge signal read from the radiation detection unit 200 is transmitted through the data wiring to be sent to the signal processing board 122. To be input.

  The signal processing board 122 includes a signal amplification circuit and a sample hold circuit provided for each individual data line, and the electric signal transmitted through each data line is sampled after being amplified by the signal amplification circuit. It is held in the hold circuit.

  Also, on the output side of the sample and hold circuit, a multiplexer (not shown) and an A / D converter 124 as an example of an electric signal converter that converts an electric signal carrying image information are connected in order. . The charge signals held in the individual sample and hold circuits are sequentially (serially) output by the multiplexer, and the analog electric signal is converted into a digital electric signal by the A / D converter 124.

  The second chamber 112 is provided with a power supply circuit board 128 that generates output power required from the input power. The power supply circuit board 128 transforms the direct current voltage from the power supply to a desired voltage and emits radiation. Supply to the detection unit 200 and various circuits and elements. The second chamber 112 is provided with a control unit 129 as an example of a communication unit that transmits and receives signals to and from the outside.

  In the present embodiment, a signal processing board 122, an A / D converter 124, a power circuit board 128, and a control unit 129 are arranged in the second chamber 112 as heat generating parts. Of the plurality of heat generating units arranged in the second chamber 112, for example, the power circuit board 128 and the control unit 129 are arranged outside the second chamber 112 (housing 102) as shown in FIG. It may be.

  Further, as shown in FIGS. 1A and 1B, the signal processing board 122 is provided with a heat radiating member 140 that dissipates heat of the signal processing board 122. The heat dissipating member 140 is in contact with the signal processing board 122 and absorbs heat of the signal processing board 122. Further, the heat radiating member 140 does not contact the inner wall of the housing 102 (second chamber 112), and dissipates the absorbed heat into the second chamber 112.

  The heat radiating member 140 is made of a material having better thermal conductivity than the signal processing board 122 serving as a heat generating portion on which the heat radiating member 140 is provided. When the signal processing board 122 is configured by an IC chip whose exterior is formed of plastic or the like, the heat radiating member 140 is a metal plate such as aluminum, for example.

  The heat radiating member 140 may be provided on the signal processing board 122 via a heat conducting member that conducts heat. The heat radiating member 140 is not limited to the signal processing board 122 but may be provided in the A / D converter 124, the power circuit board 128, and the control unit 129, which are other heat generating parts.

  Further, in the second chamber 112, a fan 142 that blows air is provided as an example of a circulating means for circulating gas in the second chamber 112. The fan 142 is disposed on the inner wall 112C side of the inner walls 112A, 112C facing each other among the inner walls 112A, 112B, 112C, 112D forming the four sides of the second chamber 112. The fan 142 is disposed at the center of the inner wall 112C, and sends air vertically to the inner wall 112A facing the inner wall 112C. Thereby, after the air sent to the inner wall 112A hits the inner wall 112A, it is divided into inner walls 112B and 112D on both sides, and returns to the inner wall 112A along the inner walls 112B and 112D. As described above, the air circulates in the second chamber 112 in two rings in a plan view. The fan 142 sucks air from the suction port 142A on the side opposite to the side where the partition wall 104 is located.

  Further, the signal processing board 122 serving as a heat generating part is disposed on the inner wall 112A side. Accordingly, since the distance between the signal processing board 122 and the fan 142 can be increased, air that is not heated by the signal processing board 122 can be blown from the fan 142 to the signal processing board 122, and the heat absorption effect from the signal processing board 122 is increased. . Further, the signal processing board 122 serving as a heat generating portion is provided to extend along the inner wall 112A, and the air sent from the fan 142 hits the side surface of the signal processing board 122 perpendicularly.

  Further, a spacer 130 is provided between the signal processing board 122, the A / D converter 124, the power circuit board 128, the control unit 129, and the partition wall 104, as shown in FIG. The spacer 130 is insulated from the signal processing board 122, the A / D converter 124, the power supply circuit board 128, the control unit 129 and the partition wall 104. The spacer 130 forms a gap between the signal processing board 122, the A / D converter 124, the power circuit board 128, the control unit 129 and the partition wall 104.

  The air circulated by the fan 142 flows through this gap. Thereby, the heat of the signal processing board 122, the A / D converter 124, the power circuit board 128, and the control unit 129 can be efficiently dispersed.

  The gas circulated by the fan 142 is not limited to air, and may be a gas (for example, nitrogen) sealed in the second chamber 112.

(Operation of this embodiment)
Next, the operation of the above embodiment will be described.

  According to the configuration of the radiation detection apparatus 100, the signal processing board 122, the A / D converter 124, the power circuit board 128, and the control unit 129, which are heat generating parts, generate heat. The heat of the signal processing board 122 is dissipated into the second chamber 112 by the heat radiating member 140.

  The air from the fan 142 is sent to the power circuit board 128, the control unit 129, the A / D converter 124, and the signal processing board 122. When the air that has passed through the power circuit board 128, the control unit 129, the A / D converter 124, and the signal processing board 122 reaches the inner wall 112A, it hits the inner wall 112A and then separates toward the inner walls 112B and 112D on both sides. Return to the inner wall 112C along the inner walls 112B and 112D. As described above, the air circulates in the second chamber 112 in two rings in a plan view. As described above, by circulating the air, the temperature in the second chamber 112 is made uniform, and the formation of a temperature distribution in the second chamber 112 can be suppressed.

  The second chamber 112 may be provided with a guide 150 that guides the air in the direction in which the air from the fan 142 circulates as shown in FIG. The guide 150 is disposed at the center of the second chamber 112 in plan view, and is constituted by a pair of plates. The guide 150 guides the air sent out from the fan 142 to the inner wall 112A between the pair of plates, and guides the air to spread on the inner walls 112B and 112D on the inner wall 112A side. In this way, the guide 150 guides air, whereby a circulation flow without stagnation can be formed.

  Further, the arrangement position of the fan 142 in the second chamber 112 can be set as appropriate. For example, as shown in FIG. 4, the second chamber 112 may be arranged in the center of the plan view. In this configuration, since the distance from the signal processing board 122 / A / D converter 124, which is a heat generating portion, is shorter than the configuration shown in FIG. 1A, the signal processing board 122 / A / D converter 124 is sprayed. The wind speed of the air is increased. Further, as shown in FIG. 5, the fan 142 may be arranged at a corner formed by the inner wall 112C and the inner wall 112D. In this configuration, the fan 142 sends air to the inner wall 112A side along the inner wall 112D. As a result, air circulates in the second chamber 112 in a circular pattern in plan view along one path along the inner walls 112D, 112A, 112B, and 112C.

  Further, as shown in FIG. 6, an opening 102 </ b> A for taking outside air into the housing 102 may be formed in the housing 102 at a position facing the suction port 142 </ b> A of the fan 142. Thereby, cold air can be taken in.

  Further, as shown in FIG. 7, a convex portion 160 for expanding the surface area may be formed on the outer surface of the housing 102. A heat radiating fin may be used as the convex portion 160. Further, as shown in FIG. 8, a recess 162 for expanding the surface area may be formed on the outer surface of the housing 102.

  As described above, by forming the convex portion 160 or the concave portion 162 for increasing the surface area, the heat dissipation effect is enhanced.

  Further, as a guide for guiding the air from the fan 142, a guide 144 as shown in FIG. 9 may be provided in the second chamber 112. The guide 144 is disposed on the air feeding side of the fan 142, and divides the second chamber 112 into two areas, a first area 131 and a second area 132, in the thickness direction.

  The first region 131 is formed on the radiation detection unit 200 side, and the second region 132 is formed on the side opposite to the radiation detection unit 200. In the first area 131, an A / D converter 124, a power supply circuit board 128, and a control unit 129, which are heat generating parts, are arranged.

  The fan 142 is configured to send air to the first region 131. The guide 144 guides the air sent to the first region 131 to the inner wall 112A side, guides it to the second region 132 so as to be folded back by the inner wall 112A, and guides the fan 142 along the inner wall 112E facing the partition wall 104. Send it back. In this way, air circulates around the guide 144 in a side view.

  In the configuration in which the guide 144 is provided, a guide 150 may be further provided in the first region 132 as shown in FIG. Thereby, after the air sent to the inner wall 112A hits the inner wall 112A, it is divided into inner walls 112B and 112D on both sides, and returns to the inner wall 112A along the inner walls 112B and 112D. As described above, the air circulates in the second chamber 112 in two rings in a plan view. In this case, as shown in FIG. 10B, a guide 150 can be attached to the guide 144.

  The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made.

100 Radiation detector
102 housing
112 Second room (containment room)
122 Signal processing board (heat generating part)
124 A / D converter (heat generating part)
128 Power circuit board (heat generating part)
129 Control unit (heat generating part)
140 Heat dissipation member
142 Fan (circulation means)
144 Guide
150 Guide
160 Convex
162 recess
200 Radiation detector

Claims (6)

A radiation detector for detecting radiation;
A heat generating unit including a signal processing unit for processing a signal from the radiation detection unit;
A housing having a housing chamber for housing the heat generating portion therein and configured by a heat conductor;
A heat dissipating member that is provided in the heat generating part, dissipates heat of the heat generating part into the accommodating chamber, and does not contact the inner wall of the accommodating chamber;
A circulation means that is accommodated in the accommodation chamber, circulates gas in the accommodation chamber, and blows the gas to the heat radiating member;
A radiation detection apparatus comprising: The heat generating portion is disposed on one side of the inner walls facing the storage chamber,
The radiation detecting apparatus according to claim 1, wherein the circulation unit is disposed on the other side of the opposing inner walls of the storage chamber, and blows the gas to the heat generating portion. The storage chamber is formed in a flat shape having a spread in a plane direction perpendicular to the thickness direction,
The said circulation means attracts | sucks the said gas to the said thickness direction, discharges | emits the gas to the said plane direction, and circulates the said gas along the inner wall extended in the said plane direction. Radiation detection device.   The radiation detection apparatus of any one of Claims 1-3 provided with the guide which guides the gas in the direction through which the gas from the said circulation means circulates.   The radiation detection apparatus according to any one of claims 1 to 4, wherein a concave portion or a convex portion for increasing a surface area is formed on an outer surface of the housing.   6. The radiation detection apparatus according to claim 1, wherein a plurality of the heat generating units are arranged in the accommodation chamber and include any one of a power source and a device that transmits and receives signals to and from the outside.

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