JP2008175657A - Packing device for x-ray detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packing device for an X-ray detector, wherein a multi-stage thermo-module whose proof stress is considered to be mechanically small against a lateral force, out of a substance to be cooled constituting a part of the X-ray detector, and the multi-stage thermo-module for cooling this substance, is less affected by vibrations and shocks in the course of conveyance, is hardly damaged, and does not become a cause of a degradation. <P>SOLUTION: The substance to be cooled 40 is constituted of an X-ray detecting element 41, an FET 42, a mount section for fixing these to the multi-stage thermo-module 43, electrical wiring conductors, etc. A supporting frame 11 and a supporting frame 12 for supporting the X-ray detector 4 are installed in a packing box 10 so that the direction of the center axis (axis shown by a center line A, A') of the substance 40 and the multi-stage thermo-module 43 arranged below it may turn vertical. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a package of a detector of an analyzer equipped with an object to be cooled and a multistage thermo module for cooling the object, and in particular, energy dispersive X-ray fluorescence analysis comprising an object to be cooled and a multistage thermo module for cooling the object to be cooled. It relates to the packaging of the X-ray detector of the apparatus.

  An outline of the energy dispersive X-ray fluorescence analyzer will be described. FIG. 2 is a diagram showing a part of the configuration of the energy dispersive X-ray fluorescence analyzer. X-rays generated in the X-ray tube 1 are applied to the sample 2 placed in the measurement chamber 3. Various fluorescent X-rays are generated from the sample 2 and detected by the X-ray detector 4. The output of the X-ray detector 4 is processed for qualitative analysis and quantitative analysis. The X-ray detector 4 detects an X-ray and generates an electric charge, an X-ray detection element 41, a preamplifier 44 that converts the electric charge into a voltage, an FET 42 arranged at an input stage thereof, and an object 40 to be cooled. A multistage thermo module 43, a vacuum vessel 45, an ion pump 46 for holding the vacuum vessel 45 in a vacuum, and the like.

  The object to be cooled 40 is composed of an X-ray detection element 41, an FET 42, a mount portion for fixing them to the multistage thermo module 43, and electrical wiring (not shown), and is contained in a vacuum vessel 45 that is less affected by ambient temperature. It is arranged. The mount portion is usually made of metal so that it can be cooled effectively, and the weight of the object to be cooled 40 is about 0.5 N, for example.

  The X-ray detection element 41 is made of a semiconductor such as silicon lithium, and is cooled and used together with the FET 42 in order to suppress thermal noise. Thermal noise increases with increasing cooling temperature and energy resolution decreases with increasing thermal noise. Generally, in X-ray fluorescence analysis, the energy resolution is required to be 150 eV or less. In order to satisfy this requirement, it is necessary to cool to −80 ° C. or lower (see, for example, Patent Document 1).

  For example, in the cooling with liquid nitrogen, the cooling temperature is the liquid nitrogen temperature (−196 ° C.), but when a Peltier element is used, the lowest reached temperature of cooling becomes about −100 ° C. by configuring a multistage thermo module. .

  FIG. 3 is a diagram showing an outline of a multistage thermo module. In FIG. 3, the multistage thermo module 43 is formed by stacking a plurality of one-stage modules in a pyramidal manner by sandwiching several tens to one hundred or more Peltier elements 50 between ceramic plates 51. The temperature difference between the uppermost stage and the lowermost stage is large at about 100 ° C., but the endothermic amount is small. The multi-stage thermo module 43 in which the Peltier element 50 and the ceramic plate 51 are bonded with a special solder material can withstand a certain amount of longitudinal force, but mechanical strength is small against lateral force. It is said that.

  As shown in FIG. 2, the energy dispersive X-ray fluorescence analyzer is placed in the measurement chamber 3 in which the sample 2 is placed and shielded upward, so that the X-ray tube 1 and the X-ray detector 4 are placed downward. It is disposed at a predetermined angle, for example, an angle of 45 degrees with respect to the vertical direction. Therefore, as shown in FIG. 4, about 0.35 N that is a 45 degree component of the weight of the object to be cooled 40 of about 0.5 N acts in the lateral direction of the multistage thermo module 43. However, when the X-ray detector 4 is incorporated in the apparatus, there is no vibration generated during the transfer, and the force acting in the lateral direction of the multistage thermo module 43 is only about 0.35 N, and the multistage thermo module 43 is It can withstand this.

  Usually, when the energy dispersive X-ray fluorescence analyzer is transferred, the X-ray detector 4 is removed and stored in a dedicated packing box. Conventionally, this packaging box is designed to be the smallest or designed so that the storage direction of the X-ray detector 4 in the packaging box and the installation direction are the same.

FIG. 5 is a view showing a conventional X-ray detector packing device. In FIG. 5, an object to be cooled 40 includes an X-ray detection element 41, an FET 42, a mount portion for fixing them to a multistage thermo module 43, and electrical wiring (not shown). X-ray detection so that the direction of the central axis (the axes indicated by the center lines A and A ′) of the object to be cooled 40 and the multistage thermo module 43 disposed below it is 45 degrees with respect to the vertical direction. A support frame 62 and a support frame 61 that support the container 4 are loaded in the packing box 60. As shown in FIG. 4, a force of about 0.35 N is applied in the lateral direction of the multistage thermo module 43 in this packing machine, and the vertical vibration generated mainly by a step or the like on the road surface is being transferred to this force. A 45-degree component of force due to impact is added, and this effect may damage the multistage thermo module 43 or cause deterioration.
JP 2005-308632 A

  The object to be cooled 40 and the multistage thermo module 43 for cooling the object 40 constitute a part of the X-ray detector 4. X-ray detection for multi-stage thermo module 43, which is considered to have low mechanical strength against lateral force, is less affected by vibration and shock during transfer, is less likely to be damaged, and does not cause deterioration A packaging device for the container 4 is provided.

  For the X-ray detector equipped with an object to be cooled and a multi-stage thermo module for cooling it, the center axis of the object to be cooled and the multi-stage thermo module disposed below is supported in the same direction as the direction of gravity. A packing machine that loads the supporting frame into a packing box placed horizontally.

  A packaging machine in which the support frame is composed of a plurality of divided bodies.

  Since the object to be cooled and the multistage thermo-module disposed below it are stored in the packing box so that the direction of the central axis is the same as the direction of gravity, mechanical force is applied to the lateral force. The lateral component of gravity acting on the multi-stage thermo module, which is considered to have a low yield strength, is zero when stationary. Also, in the case of a multistage thermo module being transported, the lateral component of the force due to vertical vibrations / impacts mainly caused by steps on the road surface during transport is zero, causing damage and deterioration. There is little possibility.

  The X-ray detector is stored in a packing box with an appropriate cushion so as not to be covered.

  On the outer surface of the packing box, “Caution for broken objects”, “No horizontal loading” and “No falling” are displayed.

  An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a view showing a packaging device for an X-ray detector according to the present invention. In FIG. 1, an object to be cooled 40 includes an X-ray detection element 41, an FET 42, a mount portion for fixing them to a multistage thermo module 43, and electrical wiring (not shown). Support for supporting the X-ray detector 4 so that the direction of the central axis (the axes indicated by the center lines A and A ′) of the object to be cooled 40 and the multistage thermo module 43 disposed below the object 40 is vertical. A frame 12 and a support frame 11 are loaded in the packing box 10.

  Since the present invention has the above configuration, the direction of the center axis (the axes indicated by the center lines A and A ′) of the object to be cooled 40 and the multistage thermo module 43 disposed below the object 40 is the direction of gravity. The lateral component of gravity acting on the multistage thermo module 43, which is considered to be mechanically resistant to the lateral force, is zero when stationary. It becomes. Also, in the case of the multistage thermo module 43 being transferred, the lateral component of the force due to vertical vibrations / impacts mainly caused by steps on the road surface during transfer is zero, causing damage and deterioration. Less likely to do.

  In the embodiment shown in FIG. 1, the X-ray detector 4 is arranged so that the object to be cooled 40 is on the upper side and stored in the packing box 10. Even if the X-ray detector 4 is arranged and stored in the packaging box 10, the present invention is applicable, and the packaging device is not limited to the illustrated example. Further, the shape and the number of the support frames are not limited to the illustrated example and are not limited to two, and may be a combination of three to four.

  In the embodiment, the support frame 11 is mounted on the upper side and the support frame 12 is loaded on the lower side. However, the upper support frame 11 is deleted and the X-ray detector 4 is fixed to the support frame 12 with a band or the like. The present invention can be applied even if the bolt is fixed to the bottom of the packaging box 10 with a bolt or the like. Further, the shape and the number of the support frames 12 are not limited to the illustrated example and are not limited to one, and a plurality of combinations can be used. Thus, the packaging device can have various configurations, and the present invention includes these modifications.

  The present invention relates to a package of a detector of an analyzer equipped with an object to be cooled and a multistage thermo module for cooling the object, and in particular, energy dispersive X-ray fluorescence analysis comprising an object to be cooled and a multistage thermo module for cooling the object to be cooled. It relates to the packaging of the X-ray detector of the apparatus.

It is a figure which shows the packaging device of the X-ray detector of this invention. It is a figure which shows a part of structure of an energy dispersive X-ray-fluorescence analyzer. It is a figure which shows the outline | summary of a multistage type thermo module. It is a figure which shows the outline | summary of the force which acts on a multistage thermo module. It is a figure which shows the packaging device of the conventional X-ray detector.

Explanation of symbols

1 X-ray tube 2 Sample 3 Measurement chamber 4 X-ray detector 10 Packing box 11 Support frame 12 Support frame 40 Object to be cooled 41 X-ray detection element 42 FET
43 Multistage thermo module 44 Preamplifier 45 Vacuum vessel 46 Ion pump 50 Peltier element 51 Ceramic plate 60 Packing box 61 Support frame 62 Support frame

Claims (2)

  For the X-ray detector equipped with an object to be cooled and a multi-stage thermo module for cooling it, the center axis of the object to be cooled and the multi-stage thermo module disposed below is supported in the same direction as the direction of gravity. An X-ray detector packaging device, wherein the supporting frame is loaded in a horizontally placed packaging box.   2. The X-ray detector packing device according to claim 1, wherein the support frame is composed of a plurality of divided bodies.

Images