Isotope extraction device

Abstract

To provide an isotope extraction device which can heat a sample such as quartz up to a temperature that enables phase transition in a short time.SOLUTION: An isotope extraction device 100a comprises: a heating furnace 10 which performs heating for extracting a carbon isotope from a sample M of quartz; and a reaction cell 90 which has such a structure that a pair of test tube-like tubes 91, 92 is vertically overlapped with each other, and holds the sample M in an internal space IS. The reaction cell 90 enables extraction gas generated in the reaction cell 90 during the reaction of the sample M to be held while avoiding the contamination of the atmospheric air and the extraction gas to be recovered by utilizing a gas recovery part 21a of a separation processing device 21 after the reaction. The heating furnace 10 comprises: a plurality of light heating devices 13 which are provided around the outer side of the reaction cell 90 and collect light for the sample M; and an interior heating device 14 provided on the inner side of the reaction cell 90.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an isotope extraction device that releases gaseous target substances from rocks, and more particularly to an isotope extraction device that is suitable for extracting gasified radiocarbon from quartz by heating the quartz. [Background technology]

[0002] Surface radiation dating using radionuclides produced on the Earth's surface by cosmic ray irradiation has been developed, making it possible to estimate the age of surface exposure or the rate of erosion. In particular, surface radiation dating using quartz is advantageous due to its simple composition, chemical and physical stability, and the availability of multiple cosmogenic nuclides. 10 Be, 26 Al, and 14 Since C can cover a wide range of eras, it is expected to be a promising method and efforts are underway to put it into practical use.

[0003] For example, a high-temperature furnace is used to 14 C is extracted as CO etc., then CO is oxidized to CO2, then CO2 is purified, and the target nuclide is extracted from the obtained CO2. 14 A method for determining the amount of C present is known (Non-Patent Documents 1 and 2). 14 The samples used to determine the abundance of C were compared with other cosmogenic nuclides. 10 Be, 26 This method is advantageous in that it can be used in subsequent analyses of Al. There is also a method using LiBO2 to flux quartz by heating at a relatively low temperature (Non-Patent Documents 1 and 3). 14 The samples used for the determination of C cannot be used for the analysis of other cosmogenic nuclides.

[0004] From quartz 14 When extracting carbon as CO, it is desirable to heat the quartz to a temperature that causes a phase transition in a short time. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] NA Lifton, et al., Geochimica et Cosmochimica Acta, Vol.65, No.12 (2001), pp.1953-1969 [Non-patent document 2] Y. Yokoyama, et al., Nuclear Instruments and Methods in Physics Research B223-224 (2004) 253-258 [Non-patent document 3] NA Lifton, et al., Nuclear Instruments and Methods in Physics Research B361 (2015) 381-386 Summary of the Invention

[0006] The present invention has been made in view of the above-mentioned background art, and aims to provide an isotope extraction device that makes it possible to heat a sample such as quartz to a temperature that causes a phase transition in a short period of time.

[0007] In order to achieve the above-mentioned object, the isotope extraction apparatus of the present invention comprises a heating furnace that heats a quartz sample to extract carbon isotopes from it, and a reaction cell having a structure in which a pair of test tube-like tubes are stacked one above the other and that holds the quartz sample in its internal space, the reaction cell retaining the extracted gas generated in the reaction cell during the reaction of the quartz sample while avoiding atmospheric contamination, and enabling the extracted gas to be recovered after the reaction using the gas recovery section of the separation treatment device, and the heating furnace comprising a plurality of optical heating devices that are provided around the outside of the reaction cell and that focus light on the quartz sample to heat it, and an internal heating device provided inside the reaction cell.

[0008] In the above-mentioned isotope extraction device, the quartz sample in the reaction cell can be efficiently heated by irradiation heating from the outside of the reaction cell using a light heating device and heating from the inside of the reaction cell using an internal heating device. This allows the temperature of the quartz sample to be raised to a temperature that causes a phase transition in a short period of time, and prevents contamination from occurring.

[0009] In a specific aspect of the present invention, in the isotope extraction apparatus, the reaction cell is a quartz tube with a double structure, and includes a cavity that is airtight when the internal space is closed and that holds the quartz sample, a gas extraction section that is provided above the cavity and connected to the outside and that releases gas generated from the quartz sample, and an access recess inside for inserting an internal heating device. In this case, the quartz sample held in the cavity can be efficiently heated and carbon isotopes can be efficiently extracted while maintaining a vacuum state.

[0010] In yet another aspect of the present invention, the light heating device includes a halogen lamp and a mirror. In this case, by irradiating and heating with a plurality of halogen lamps, it is possible to efficiently heat a predetermined region.

[0011] In yet another aspect of the present invention, the internal heating device includes a tungsten heater, which allows efficient heating even in a narrow space inside the reaction cell.

[0012] In yet another aspect of the present invention, the gas extraction unit has a light-absorbing shielding zone. In this case, heat leakage from the reaction cell can be suppressed. This allows the O-ring provided in the gas extraction unit for maintaining a high vacuum to be kept healthy.

[0013] In yet another aspect of the present invention, the gas extraction unit has a groove for an O-ring joint for connection to an external device. In this case, by attaching an O-ring to the groove to prevent leakage due to pressurization or vacuum, a high vacuum can be maintained. [Brief explanation of the drawings]

[0014] [Figure 1]FIG. 1 is a diagram illustrating an overview of an isotope extraction analysis apparatus including a heating furnace. [Figure 2] FIG. 2 is a partial cross-sectional plan view of a heating furnace. [Figure 3] FIG. 2 is a side view illustrating the structure of a reaction cell. [Figure 4] 10(A) to 10(C) are diagrams illustrating elements to be inserted into the access recess of the reaction cell. [Figure 5] 1 is a flowchart outlining an analysis method using an isotope extraction analysis device. DETAILED DESCRIPTION OF THE INVENTION

[0015] [Embodiment] Hereinafter, an embodiment of an isotope extraction analysis apparatus 100 including an isotope extraction apparatus 100a according to the present invention will be described with reference to the drawings.

[0016] 1, the isotope extraction analysis apparatus 100 includes a heating furnace 10, a separation treatment device 21, a nuclide measurement device 22, and a control device 30. The isotope extraction analysis apparatus 100 also includes, as elements associated with the heating furnace 10, an external heating drive device 40, a radiation thermometer drive device 50, an internal heating drive device 60, a temperature detection circuit 70, an inert gas supply device 80, etc. Of the isotope extraction analysis apparatus 100, the heating furnace 10, the external heating drive device 40, the radiation thermometer drive device 50, the internal heating drive device 60, the temperature detection circuit 70, the inert gas supply device 80, the separation treatment device 21, and the control device 30 constitute an isotope extraction apparatus 100a.

[0017] As shown in Figures 1 and 2, the heating furnace 10 includes a container 11, a lid block 12, a plurality of optical heating devices 13, an internal heating device 14, and a radiation thermometer 15. The heating furnace 10 is supported in the air by a frame 16. A reaction cell 90 can be detachably attached to the heating furnace 10. In Figure 1, the heating furnace 10 is shown as a cross section taken along line AA in Figure 2.

[0018] The container 11 has a cylindrical main body 11a and a cylindrical support 11b. Front ends 13a of six light heating devices 13 are embedded and held in openings 11c formed in the side of the main body 11a. The light heating devices 13 are arranged at equal intervals around the axis AX of the reaction cell 90 along a plane perpendicular to the axis AX. The main body 11a of the container 11 secures each light heating device 13 in an airtight manner. Each light heating device 13 irradiates heating light, including infrared light, so that it is focused toward the central region of the container 11. The lid block 12 is a cylindrical member and seals the top opening 11d of the container 11. The lid block 12 has a hole 12a in the center through which the reaction cell 90 is inserted, securing the reaction cell 90 in an airtight manner. This allows the tip of the reaction cell 90 to be set in the central region of the container 11. The tip of a radiation thermometer 15 is embedded in one location on the bottom of the container 11.

[0019] The vessel 11 and the lid block 12 are made of aluminum and have internal water-cooling channels (not shown). By water-cooling the vessel 11 and the lid block 12, the light heating device 13 and the reaction cell 90 can be cooled, and deterioration of the O-ring R (described later) attached to the light heating device 13 and the reaction cell 90 can be suppressed. The surfaces of the base materials of the vessel 11 and the lid block 12 are coated with a thin gold film. This thin film efficiently reflects heating light, including infrared rays, from the light heating device 13, preventing heating of the vessel 11 and assisting in heating of the lower end 90b of the reaction cell 90.

[0020] The reaction cell 90 shown in Figure 3 is used in a vacuum-depressurized state, and holds a quartz sample M in the reduced-pressure space at the lower end 90b of the reaction cell 90. The reaction cell 90 is made of quartz glass and consists of a pair of test-tube-like tubes 91 and 92 stacked one inside the other. In other words, the reaction cell 90 is a double-structure quartz tube, one of which constitutes the inner tube 91 and the other the outer tube 92. Each tube 91 and 92 has a cylindrical wall 91a and 92a and a hemispherical bottom 91b and 92b, and the upper ends of both tubes 91 and 92 are airtightly joined.

[0021] The reaction cell 90 has a cavity 93 , a gas extraction section 94 and an access recess 95 .

[0022] The hollow portion 93 is a main body portion sandwiched between the outer tube 92 and the inner tube 91, and has an internal space IS. The hollow portion 93 is airtight when the internal space IS is closed. The internal space IS has a cylindrical space of approximately uniform thickness and a bottom space of the same thickness or less than that of the cylindrical space. The hollow portion 93 has a sample storage space SS within the internal space IS at the lower end 90b of the reaction cell 90. A sample M is held in the sample storage space SS.

[0023] The gas extraction unit 94 has a passage Pa and is connected to the upper part of the outer tube 92 in the hollow portion 93 of the reaction cell 90 so as to communicate with the internal space IS. The gas extraction unit 94 extends diagonally upward from the outer tube 92. The gas extraction unit 94 is connected to the external recovery line ML shown in FIG. 1 and releases gas generated from the sample M to the gas recovery unit 21a of the separation treatment device 21 (described later). The gas extraction unit 94 retains the extracted gas generated in the reaction cell 90 during the reaction of the sample M, avoiding atmospheric contamination, and enables the extracted gas to be recovered using the gas recovery unit 21a of the separation treatment device 21 after the reaction. The extracted gas is retained within the reaction cell 90 by separating the gas recovery unit 21a from the reaction cell 90 using a needle valve provided on the recovery line ML connecting the gas extraction unit 94 and the gas recovery unit 21a. A vacuum pump (not shown) is provided on the recovery line ML to reduce the pressure inside the reaction cell 90.

[0024] The gas extraction unit 94 is cylindrical and has a light-absorbing shielding zone 94a in its center. The shielding zone 94a is arranged to surround the passage Pa. The shielding zone 94a is an opaque quartz tube attached separately to the gas extraction unit 94. It blocks the heating light that travels through the reaction cell 90 and leaks toward the separation treatment device 21, specifically the gas recovery unit 21a, and prevents overheating and deterioration of the gas recovery unit 21a, which is connected to the connection part 94b at the tip of the gas extraction unit 94. The provision of the shielding zone 94a also helps maintain the integrity of the O-ring R provided in the gas extraction unit 94 to maintain a high vacuum. An annular groove 94c is formed on the outer side of the connection part 94b of the gas extraction unit 94. The groove 94c is an O-ring joint for connecting to the gas recovery unit 21a of the separation treatment device 21, which is an external device, via the recovery line ML. It allows the attachment of an O-ring R, which ensures an airtight connection. A high vacuum can be maintained by attaching an O-ring R to the groove 94c to prevent leakage due to pressurization or vacuum. As the O-ring R, an O-ring made of a fluororubber material such as Viton O-ring (registered trademark) is used.

[0025] The access recess 95 is formed at the lower end of the inner tube 91 so as to protrude into the sample storage space SS. The access recess 95 is connected to the upper end 90a of the reaction cell 90 via the center side of the inner tube 91. The internal heating device 14 is inserted into the access recess 95.

[0026] The reaction cell 90 having the above structure makes it possible to efficiently heat the sample M held in the cavity 93 and efficiently extract carbon isotopes while maintaining a vacuum state.

[0027] As an example of the dimensions of the reaction cell 90, the length of the outer shape of the cavity 93 in the direction of the axis AX is, for example, 25 cm, and the length of the outer shape in the radial direction is, for example, 20 cm. The inner diameter of the cavity 93, i.e., the distance between the outer tube 92 and the inner tube 91, is approximately uniform along the portion extending along the axis AX, for example, 5.5 mm, and is narrower at the bottom of the access recess 95 than along the portion extending along the axis AX. The length of the inside of the cavity 93, i.e., the radial length of the access recess 95, is, for example, 9 mm. The length of the gas extraction portion 94 is, for example, 8.5 cm.

[0028] The optical heating device 13 is a combination of a halogen lamp 13b and a mirror 13c. The optical heating device 13 collects the heating light emitted from the halogen lamps 13b and converges it at the lower end 90b of the reaction cell 90. By irradiating and heating with multiple halogen lamps 13b, a predetermined area can be efficiently heated. The halogen lamp 13b is a bulb filled with an inert gas, such as nitrogen or argon, to which a small amount of halogen gas, such as iodine or bromine, is added. When electricity is applied to the filament inside the bulb, the filament becomes incandescent, and light emission is maintained through a halogen cycle using the halogen gas. The power of the halogen lamp 13b is, for example, 450 W. The mirror 13c has a spherical or ellipsoidal reflective surface and efficiently reflects the heating light. The reflective surface of the mirror 13c is coated with, for example, a thin film of gold. The mirror is not limited to a surface-reflecting mirror, but may also be a mirror that utilizes back-reflecting mirrors.

[0029] The internal heating device 14 has a thermocouple 14a shown in Fig. 4(A), a tungsten heater 14b shown in Fig. 4(B), and an inert gas introduction pipe 14c shown in Fig. 4(C). By including the tungsten heater 14b, the internal heating device 14 can efficiently heat even the narrow space inside the reaction cell 90.

[0030] The thermocouple 14a is formed by joining a platinum conductor T1 and a rhodium conductor T2 at their tips, with the conductors T1 and T2 covered by quartz glass tubes T3 and T4, respectively, to prevent short circuits. The tungsten heater 14b has a coil C1 located at its tip and a pair of conductors C2 and C3 extending from the coil C1, with the conductor C2 covered by a quartz glass tube C4 to prevent short circuits. The coil C1 is made of tungsten wire, and the conductors C2 and C3 extending from the coil C1 are, for example, tungsten wire and nickel wire connected together. The maximum outer diameter of the tungsten heater 14b is, for example, 6 mm. The thermocouple 14a and an inert gas introduction tube 14c are inserted into the coil C1 at its tip. The inert gas introduction tube 14c is made of quartz glass and has an air hole E. The inert gas inlet pipe 14c supplies Ar gas at a predetermined flow rate to the periphery of the coil portion C1 of the tungsten heater 14b through the vent hole E. The Ar gas prevents oxidation of the tungsten heater 14b. The internal heating device 14 includes the inert gas inlet pipe 14c and the quartz glass tubes T3, T4, and C4, which can prevent deterioration of the thermocouple 14a and the tungsten heater 14b at extremely high temperatures.

[0031] The external heating driver 40 operates under the control of the control device 30, adjusting the timing and duration of lighting of the optical heating device 13, enabling rapid and accurate heating of the bottom end 90b of the reaction cell 90. The external heating driver 40 operates while feeding back the measurement results from the radiation thermometer 15 and the thermocouple 14a, and heats the sample M held in the sample storage space SS to a target temperature, specifically, 1550°C to 1650°C. The shorter the time required for heating, the better, and specifically, heating to the target temperature, specifically, the temperature at which quartz undergoes a phase transition, is achieved in 5 to 10 minutes. The shorter the time required for heating, the less contamination can be caused, so 14 The sample M is made by crushing rock containing the target nuclide and purifying it into quartz, and is heated by the light heating device 13 until the target phase transition occurs. The sample M is collected at the destination, specifically, in situ generated 14When sample M is heated until the target phase transition occurs, 14 C or 14 It releases CO gas containing C.

[0032] The radiation thermometer driving device 50 operates under the control of the control device 30 and non-contactly measures the surface temperature of the lower end 90b of the reaction cell 90, i.e., the temperature of the sample M held in the sample storage space SS. The internal heating driving device 60 operates under the control of the control device 30 and supplementarily heats the lower end 90b of the reaction cell 90 by adjusting the power supply to the tungsten heater 14b. The tungsten heater 14b heats the sample M uniformly, preventing phase transition leakage of the inserted sample M. The temperature detection circuit 70 operates under the control of the control device 30 and measures the temperature of the lower end 90b of the reaction cell 90 from inside via the thermocouple 14a. The inert gas supply device 80 operates under the control of the control device 30 and prevents the tungsten heater 14b from oxidizing while the sample M is being heated.

[0033] The separation treatment device 21 has a gas recovery section 21a and a separation treatment section 21b. The separation treatment device 21 operates under the control of the control device 30, and oxidizes and purifies the extracted gas recovered in the gas recovery section 21a.

[0034] The gas recovery unit 21a recovers the extracted gas, which is held in the reaction cell 90, specifically the gas extraction unit 94, during the reaction, from the gas extraction unit 94 after the reaction. The gas recovery unit 21a recovers the extracted gas, for example, by cooling a low-temperature trap with liquid nitrogen.

[0035] The separation processing unit 21b is connected to the gas recovery unit 21a via a processing line NL. 14 The CO gas containing C is converted into CO gas by oxidizing it under a carrier gas, and unnecessary gas components are removed using a trap or the like. 14 CO2 gas containing carbon etc. is graphitized.

[0036] The nuclide measuring device 22 is 14The nuclide measuring device 22 is, for example, an accelerator mass spectrometry (AMS) device installed in a separate building, 14 From graphite containing C etc. 14 C and 12 The amount of C, etc. is measured at the atomic number level.

[0037] An example of a method for extracting and analyzing a sample M using the isotope extraction analysis apparatus 100 will be described below with reference to FIG.

[0038] First, the quartz, which is the sample M, is pretreated (step S11). Specifically, the rock is crushed, the quartz is beneficiated, and washed. The pretreated sample M is stored in the sample storage space SS of the reaction cell 90. For example, the sample M may be in situ generated quartz in order to measure the background level. 14 Quartz samples collected deep underground that do not contain C can be used. Also, to measure the extraction efficiency, 14 Quartz samples with known C concentrations that have reached radioactive equilibrium can be used, and the measurements of these samples can be used to calibrate other samples.

[0039] Next, the reaction cell 90 containing the sample M is heated by the heating furnace 10. 14 Specifically, the sample M is heated to, for example, 450°C or 500°C under vacuum, and atmospheric meteoric acid, which may cause contamination, is extracted (step S12). 14 Then, a carrier gas consisting of oxygen or O2-CO2-He is filled into the reaction cell 90, and the sample M is heated in vacuum at, for example, 1550°C or 1650°C for about 10 minutes, and the in situ generated 14 C or 14The CO component containing C is recovered from the gas extraction section 94 of the reaction cell 90. Specifically, during the reaction of sample M, the extracted gas is held in the gas extraction section 94 to avoid atmospheric contamination. After the reaction of sample M, the needle valve provided in the recovery line ML is opened to open the recovery line ML, and the extracted gas is recovered using a low-temperature trap cooled with liquid nitrogen in the gas recovery section 21a built into the separation treatment device 21. As described above, the in situ generated CO 14 By extracting C under high vacuum in a short time, the carbon from the atmosphere is 14 This also prevents the generation of C, thereby preventing the occurrence of contamination.

[0040] Next, in the separation processing unit 21b of the separation processing device 21, the extracted 14 C or CO is oxidized (step S13). Specifically, the gas generated from the sample M is oxidized by a catalytic reaction using platinum and a carrier gas consisting of oxygen or O2-CO2-He, for example, to generate CO2.

[0041] Next, the oxidized CO2 is purified in the separation processing unit 21b of the separation processing device 21 (step S14). Specifically, water vapor and gases other than CO2 are removed from the gas that has passed through step S13 using a trap or the like.

[0042] Next, in the separation processing unit 21b of the separation processing device 21, the purified CO2 is graphitized by reduction using a metal catalyst (step S15). Specifically, the purified CO2 is mixed with H2 and a reduction reaction is carried out using iron as a catalyst to produce graphite. Note that graphite may also be produced by a reduction reaction of the purified CO2 using a combination of zinc and iron, or cobalt as a catalyst. Note that the graphite produced in the separation processing device 21 is packed into an aluminum tube by pressing graphite powder into the tube, and the tube is then attached to the analysis unit of the nuclide measurement device 22.

[0043] Finally, the nuclide measurement device 22 quantifies C using the graphitized C (step S16). Specifically, an AMS is used to irradiate a target with cesium positive ions to generate negative carbon ions from graphite, and the negative carbon ions are converted into positive ions by accelerating them with high energy and colliding them with a thin film, and the masses of the carbon isotopes are analyzed. In the AMS, mass is selected by passing through a magnetic field, for example, 14 C. 13 C. 12 The C isotope ratio can be measured.

[0044] In the isotope extraction apparatus 100a, the sample M in the reaction cell 90 can be efficiently heated by irradiation heating from the outside of the reaction cell 90 by the optical heating device 13 and heating from the inside by the internal heating device 14. This allows the sample M, such as quartz, to be heated to a temperature that causes a phase transition in a short period of time, preventing contamination. Furthermore, since the isotope extraction apparatus 100a does not use a solvent in the carbon isotope extraction process, the sample M can be reused after the carbon isotopes have been extracted, for example, to extract other isotopes.

[0045] The isotope extraction and analysis device 100 incorporating the above-mentioned isotope extraction device 100a can be used as a sample extraction and analysis system for surface irradiation dating, and can measure the exposure age of rocks by dating using cosmogenic nuclides produced in the rocks.

[0046] 〔others〕 Although the present invention has been described above based on the embodiment, the present invention is not limited to the above embodiment. For example, although the halogen lamp 13b is used as the light heating device 13, other light sources such as an infrared carbon lamp or a laser may also be used. When a laser is used as the light source, the irradiation area is more localized than that of the halogen lamp 13b.

[0047] In the above embodiment, six light heating devices 13 are arranged around the axis AX of the reaction cell 90, but the arrangement and number can be changed as appropriate. Also, the light heating devices 13 may be arranged in two stages.

[0048] In the above embodiment, the shielding zone 94a provided in the gas extraction section 94 of the reaction cell 90 is formed by joining an opaque quartz tube separately, but it may be formed by crystallizing a part of the gas extraction section 94 to make it opaque, or by fusing opaque glass to the quartz tube.

[0049] In the above embodiment, the heating temperature and heating time in the heating furnace 10 can be changed as appropriate. [Explanation of symbols]

[0050] 10...heating furnace, 11...container, 11a...main body, 11b...support part, 12...lid block, 12a...hole, 13...light heating device, 13b...halogen lamp, 13c...mirror, 14...internal heating device, 14a...thermocouple, 14b...tungsten heater, 14c...inert gas introduction tube, 15...radiation thermometer, 16...frame, 21...separation treatment device, 21a...gas recovery part, 21b...separation treatment part, 22...nuclide measuring device, 30...control device, 40...external heating drive device, 50...radiation thermometer drive device, 60...internal heating drive device, 70...temperature detection circuit, 80...inert gas supply device, 90...reaction cell, 91...inner tube, 91a, 92a...wall part, 91b, 92b...bottom part, 92...outer tube, 93...Cavity portion, 94...Gas extraction portion, 94a...Shielding zone, 94b...Connection portion, 94c...Groove, 95...Access recess, 100...Isotope extraction analysis device, 100a...Isotope extraction device, C1...Coil portion, C2, C3...Conducting wire, C4...Quartz glass, IS...Inner space, R...O-ring, SS...Sample storage space, T1, T2...Conducting wire, T3...Quartz glass tube

Claims

1. a heating furnace for heating the quartz sample to extract carbon isotopes; a reaction cell having a structure in which a pair of test tubes are stacked one above the other and holding the quartz sample in its internal space; Equipped with the reaction cell retains the extracted gas generated in the reaction cell during the reaction of the quartz sample while avoiding atmospheric contamination, and enables the extracted gas to be recovered after the reaction by using a gas recovery unit of a separation treatment device; The heating furnace is an isotope extraction device having a plurality of optical heating devices that are provided around the outside of the reaction cell and that focus light onto the quartz sample to heat it, and an internal heating device that is provided inside the reaction cell.

2. 2. The isotope extraction device according to claim 1, wherein the reaction cell is a double-structured quartz tube, and has a hollow portion that is airtight when the internal space is closed and that holds the quartz sample, a gas extraction portion that is provided at the top of the hollow portion and connected to the outside and that releases gas generated from the quartz sample, and an access recess inside for inserting the internal heating device.

3. The isotope extraction device according to claim 1 or 2, wherein the light heating device comprises a halogen lamp and a mirror.

4. 4. The isotope extraction apparatus according to claim 1, wherein the internal heating device includes a tungsten heater.

5. The isotope extraction device according to claim 2 , wherein the gas extraction section has a light-absorbing shielding zone.

6. 6. The isotope extraction device according to claim 2, wherein the gas extraction section has a groove for an O-ring fitting for connection to an external device.

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