CN111101201A - Lanthanum cerium bromide crystal and preparation method thereof - Google Patents
Lanthanum cerium bromide crystal and preparation method thereof Download PDFInfo
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- CN111101201A CN111101201A CN201811258259.0A CN201811258259A CN111101201A CN 111101201 A CN111101201 A CN 111101201A CN 201811258259 A CN201811258259 A CN 201811258259A CN 111101201 A CN111101201 A CN 111101201A
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- 239000013078 crystal Substances 0.000 title claims abstract description 59
- AGONCBOTBXYTGA-UHFFFAOYSA-H cerium(3+) lanthanum(3+) hexabromide Chemical compound [Br-].[Ce+3].[La+3].[Br-].[Br-].[Br-].[Br-].[Br-] AGONCBOTBXYTGA-UHFFFAOYSA-H 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 53
- XKUYOJZZLGFZTC-UHFFFAOYSA-K lanthanum(iii) bromide Chemical compound Br[La](Br)Br XKUYOJZZLGFZTC-UHFFFAOYSA-K 0.000 claims abstract description 32
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 28
- MOOUSOJAOQPDEH-UHFFFAOYSA-K cerium(iii) bromide Chemical compound [Br-].[Br-].[Br-].[Ce+3] MOOUSOJAOQPDEH-UHFFFAOYSA-K 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract description 7
- 230000007062 hydrolysis Effects 0.000 abstract description 5
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 238000005538 encapsulation Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 230000036284 oxygen consumption Effects 0.000 abstract 1
- 229910014323 Lanthanum(III) bromide Inorganic materials 0.000 description 5
- 229910004755 Cerium(III) bromide Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000009206 nuclear medicine Methods 0.000 description 1
- 230000005658 nuclear physics Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/12—Halides
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
- C30B33/02—Heat treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention provides a preparation method of a lanthanum-cerium bromide crystal shown as a formula (I), which comprises the following steps: A) placing cerium bromide powder, lanthanum bromide powder and a carbon material in a crucible, wherein the mass ratio of the lanthanum bromide powder to the cerium bromide powder is x: (1-x); B) and C) carrying out vacuum sealing on the crucible obtained in the step A), and then carrying out heat treatment to obtain the lanthanum-cerium bromide crystal shown as the formula (I). The application also provides a lanthanum cerium bromide crystal. This application is at the in-process of preparation lanthanum cerium bromide crystal, adds proper amount of carbon material as water, oxygen consumption agent in lanthanum cerium bromide growth raw materials, consumes raw materials from the area, crucible adheres to, raw materials are loaded, shift, encapsulation in-process water, oxygen impurity that introduce to avoid the material oxidation and the hydrolysis that take place among the crystal growth process, and then grow out transparent, the high quality lanthanum cerium bromide single crystal that does not have the fracture.
Description
Technical Field
The invention relates to the technical field of inorganic new materials, in particular to a lanthanum-cerium bromide crystal and a preparation method thereof.
Background
The scintillation crystal has great application prospect in the detector, in the fields of high-energy physics, nuclear physics, image nuclear medicine diagnosis, geological exploration, astronomical space physics and safety inspection. With the rapid development of nuclear science and other related technologies, the application field of scintillation crystals is continuously expanding. Different application fields also put more and higher demands on inorganic scintillators. The traditional NaI: the scintillation crystals such as Tl and BGO cannot meet the special requirements of new application fields.
Cerium-doped lanthanum bromide crystal (LaBr)3: ce) was discovered since 1999, the hot tide of the study was raised due to its excellent scintillation properties. Cerium-doped lanthanum bromideThe light output can reach 78000Ph/MeV, the decay time is as fast as 16ns, and the density is 5.1g/cm3The absorption capacity to high-performance rays is obviously stronger than that of NaI: tl crystal, and the risk of environmental pollution is far less than that of NaI: tl, therefore LaBr3Ce crystals have now become representative of high light output, attenuated fast scintillation crystals that are expected to replace all the NaI: tl crystal, thus widely used in the fields of medical instruments, safety inspection, oil well detection and the like.
LaBr3: the difficulty in Ce crystal growth is mainly due to LaBr3、CeBr3Is easy to absorb water and oxidize to generate CeOBr and LaOBr, which is easy to cause cracking and opaqueness of crystals. Even LaBr3、CeBr3The water oxygen content of the raw materials is extremely low, and the hydrolysis and oxidation of the materials are difficult to avoid in the processes of proportioning, tube filling and crucible packaging, so that the transparent and crack-free crystals are not easy to obtain.
Disclosure of Invention
The invention aims to provide a preparation method of lanthanum-cerium bromide crystals, and the lanthanum-cerium bromide crystals with good crystallinity and transparency can be obtained by the preparation method provided by the application.
In view of the above, the present application also provides a method for preparing a lanthanum cerium bromide crystal represented by formula (i), comprising the following steps:
A) placing cerium bromide powder, lanthanum bromide powder and a carbon material in a crucible, wherein the mass ratio of the lanthanum bromide powder to the cerium bromide powder is x: (1-x);
B) carrying out vacuum sealing on the crucible obtained in the step A), and then carrying out heat treatment to obtain a lanthanum-cerium bromide crystal shown as a formula (I);
LaxCe1-xBr3(Ⅰ)；
wherein x is more than 0 and less than 1.
Preferably, the ratio of the total mass of the lanthanum bromide powder and the cerium bromide powder to the mass of the carbon material is 1: n, 0 is more than 0 and less than 0.01.
Preferably, the heat treatment process specifically comprises:
placing the sealed crucible in the center of a Bridgman descending furnace, and adjusting the crucible to be positioned in an upper temperature area; then the crucible is cooled to a lower temperature region and then cooled to room temperature.
Preferably, the temperature of the upper temperature zone is 800-900 ℃, and the temperature of the lower temperature zone is 550-750 ℃; the heat preservation time is 24-72 h.
Preferably, the descending speed is 0.01-10 mm/h, and the cooling speed is 1-100 ℃/h.
Preferably, the carbon material is carbon powder or graphite powder.
Preferably, the vacuum sealing is carried out under a vacuum device, and the pressure of the vacuum sealing is less than 5 x 10-3Pa。
Preferably, the purity of the carbon material is > 99.99%, the purity of the cerium bromide powder is > 99.99%, and the purity of the lanthanum bromide powder is > 99.99%.
The application also provides a lanthanum cerium bromide crystal as shown in formula (I), which is prepared from cerium bromide powder, lanthanum bromide powder and a carbon material, wherein the lanthanum bromide powder and the cerium bromide powder have a mass ratio of x: (1-x);
LaxCe1-xBr3(Ⅰ)；
wherein x is more than 0 and less than 1.
Preferably, the ratio of the total mass of the cerium bromide powder and the lanthanum bromide powder to the mass of the carbon material is 1: n, 0 is more than 0 and less than 0.01.
The application provides a preparation method of a lanthanum cerium bromide crystal, which comprises the steps of placing cerium bromide powder, lanthanum bromide powder and a carbon material in a crucible and then carrying out heat treatment, thereby obtaining the lanthanum cerium bromide crystal; in the process of preparing the lanthanum-cerium bromide crystal, the carbon material is added into the lanthanum bromide and the cerium bromide, and the carbon material reacts with water and oxygen in the growth process of the lanthanum-cerium bromide crystal to ensure the non-oxidizing anhydrous atmosphere of a crucible and avoid oxidation and hydrolysis in the growth process of the lanthanum-cerium bromide crystal, so that the transparent, cracking-free and good-crystallinity lanthanum-cerium bromide crystal is obtained.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Aiming at the current situations that the growth of lanthanum-cerium bromide crystals is difficult and the prepared crystals are cracked and opaque in the prior art, the application provides a preparation method of the lanthanum-cerium bromide crystals, which ensures the non-oxidizing anhydrous atmosphere of a crucible by introducing carbon materials as water and oxygen consuming agents, thereby avoiding the material oxidation and hydrolysis in the production process of the lanthanum-cerium bromide crystals and finally growing the transparent and non-cracked high-quality lanthanum-cerium bromide crystals. Specifically, the embodiment of the invention discloses a preparation method of a lanthanum cerium bromide crystal, which comprises the following steps:
A) placing cerium bromide powder, lanthanum bromide powder and a carbon material in a crucible, wherein the mass ratio of the lanthanum bromide powder to the cerium bromide powder is x: (1-x);
B) carrying out vacuum sealing on the crucible obtained in the step A), and then carrying out heat treatment to obtain a lanthanum-cerium bromide crystal shown as a formula (I);
LaxCe1-xBr3(Ⅰ)；
wherein x is more than 0 and less than 1.
In the above-mentioned process of preparing lanthanum cerium bromide crystal, the present application first puts cerium bromide powder, lanthanum bromide powder and carbon material into a crucible for mixing the raw materials. In the process, in order to ensure that the lanthanum-cerium bromide crystal shown as the formula (I) is obtained, the mass ratio of the lanthanum bromide powder to the cerium bromide powder is x: 1-x; where 0 < x < 1, illustratively, 0.05. ltoreq. x.ltoreq.0.95, more specifically, 0.1. ltoreq. x.ltoreq.0.9. The ratio of the total mass of the lanthanum bromide powder and the cerium bromide powder to the mass of the carbon material is 1: n, 0 < n < 0.01, more specifically 0 < n < 0.005, in particular embodiments n is 0.00005 or 0.00002; the excessive content of the carbon material affects the color, transparency and light transmittance of the lanthanum cerium bromide crystal, and may cause carbon coating in the crystal. The carbon material is well known to those skilled in the art, and can be specifically selected from carbon powder or graphite powder. The purity of the cerium bromide powder is more than 99.99%, the purity of the lanthanum bromide powder is more than 99.99%, and the purity of the carbon material is more than 99.99%.
After the raw materials are mixed, the crucible filled with the mixed raw materials is subjected to vacuum sealing under a vacuum device, and the pressure of the vacuum sealing is less than 5 x 10-3Pa, in a specific embodiment, the pressure of the vacuum sealing is more than 1 × 10-4Pa is less than 1X 10-3Pa。
According to the invention, finally, the crucible after being sealed is subjected to heat treatment so as to enable polycrystalline lanthanum cerium bromide powder to gradually crystallize and grow into a lanthanum cerium bromide single crystal, and specifically, the heat treatment process comprises the following steps:
placing the sealed crucible in the center of a Bridgman descending furnace, and adjusting the crucible to be positioned in an upper temperature area; then the crucible is cooled to a lower temperature region and then cooled to room temperature.
More specifically, the sealed crucible is arranged in the center of a Bridgman descending furnace, and the position of the crucible is adjusted to be arranged in an upper temperature area; setting the temperature of an upper temperature zone to be 800-900 ℃, setting the temperature of a lower temperature zone to be 550-750 ℃, starting heating, and keeping the temperature for 24-72 hours;
and (3) descending the crucible at a descending rate of 0.01-10 mm/h to gradually crystallize the melt into a monocrystal, and gradually reducing the temperature to the room temperature at a cooling rate of 1-100 ℃/h after the crucible is completely in the lower temperature region.
In the heat treatment process, the temperature of the upper temperature zone is 820-880 ℃, and the temperature of the lower temperature zone is 580-620 ℃. The descending rate is 0.8-5 mm/h, and the cooling rate is 10-50 ℃/h.
The application also provides a lanthanum cerium bromide crystal as shown in formula (I), which is prepared from cerium bromide powder, lanthanum bromide powder and a carbon material, wherein the mass ratio of the lanthanum bromide powder to the cerium bromide powder is x: (1-x);
LaxCe1-xBr3(Ⅰ)；
wherein x is more than 0 and less than 1.
More specifically, the ratio of the total mass of the cerium bromide powder and the lanthanum bromide powder to the mass of the carbon material is 1: n, 0 is more than 0 and less than 0.01.
The invention provides a preparation method of lanthanum cerium bromide crystal, which adds carbon material in cerium bromide material and lanthanum bromide, so that the carbon material reacts with water and oxygen respectively in the growth process of the lanthanum cerium bromide crystal, and oxidation and hydrolysis of the lanthanum cerium bromide are avoided after the water and the oxygen are consumed, thereby obtaining transparent and crack-free crystal.
For further understanding of the present invention, the following examples are given to illustrate the preparation method of lanthanum cerium bromide according to the present invention, and the scope of the present invention is not limited by the following examples.
Example 1La0.95Ce0.05Br3Preparation of
1) According to La in a crucible0.95Ce0.05Br3Proportioning of 475g LaBr3And 25g of CeBr3The high-purity graphite powder with the mass fraction of 0.005 percent of the mixture is added into the mixture;
2) the crucible is vacuum-sealed in a vacuum device with the vacuum pressure of 5 multiplied by 10-4Pa；
3) Placing the sealed crucible in the center of a Bridgman descending furnace, and adjusting the position of the crucible to be in an upper temperature zone; setting the temperature of an upper temperature zone at 860 ℃, setting the temperature of a lower temperature zone at 600 ℃, starting heating, and preserving heat for 48 hours;
4) gradually crystallizing the melt into a monocrystal at a reduction rate of 1mm/h, and gradually reducing the temperature to room temperature at a reduction rate of 10 ℃/h after the crucible is completely positioned in a lower temperature region to obtain La0.95Ce0.05Br3And (3) lanthanum cerium bromide crystals.
Example 2La0.9Ce0.1Br3Preparation method of (1)
1) According to La in a crucible0.9Ce0.1Br3Proportioning configuration of 270gLaBr3And 30g of CeBr3The high-purity graphite powder with the mass fraction of 0.002 percent of the mixture is added into the mixture;
2) the crucible is vacuum-sealed in a vacuum device with the vacuum pressure of 2 multiplied by 10-4Pa；
3) Placing the sealed crucible in the center of a Bridgman descending furnace, and adjusting the position of the crucible to be in an upper temperature zone; setting the temperature of an upper temperature zone at 840 ℃ and the temperature of a lower temperature zone at 600 ℃, starting heating, and keeping the temperature for 36 hours;
4) gradually crystallizing the melt into a monocrystal at a reduction rate of 0.8mm/h, and gradually reducing the temperature to room temperature at a reduction rate of 20 ℃/h after the crucible is completely positioned in a lower temperature region to obtain La0.9Ce0.1Br3And (3) lanthanum cerium bromide crystals.
Characteristics of the lanthanum cerium bromide crystals prepared in example 1 and example 2 were examined, and the results showed that: the lanthanum cerium bromide crystal is a transparent colorless crystal, and has no inclusion and no bubbles; the crystal is an integral cylindrical transparent crystal and has no cracking and crazing; the integral quality is uniform, and the upper part of the crystal has no opaque part and no cloud-shaped and mist-shaped part; the oxygen content is less than 15ppm and the water content is less than 2 ppm.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A preparation method of lanthanum cerium bromide crystal shown as formula (I) comprises the following steps:
A) placing cerium bromide powder, lanthanum bromide powder and a carbon material in a crucible, wherein the mass ratio of the lanthanum bromide powder to the cerium bromide powder is x: (1-x);
B) carrying out vacuum sealing on the crucible obtained in the step A), and then carrying out heat treatment to obtain a lanthanum-cerium bromide crystal shown as a formula (I);
LaxCe1-xBr3(Ⅰ)；
wherein x is more than 0 and less than 1.
2. The production method according to claim 1, wherein the ratio of the total mass of the lanthanum bromide powder and the cerium bromide powder to the mass of the carbon material is 1: n, 0 is more than 0 and less than 0.01.
3. The preparation method according to claim 1, wherein the heat treatment process is specifically:
placing the sealed crucible in the center of a Bridgman descending furnace, and adjusting the crucible to be positioned in an upper temperature area; then the crucible is cooled to a lower temperature region and then cooled to room temperature.
4. The preparation method according to claim 3, wherein the temperature of the upper temperature zone is 800 to 900 ℃, and the temperature of the lower temperature zone is 550 to 750 ℃; the heat preservation time is 24-72 h.
5. The method according to claim 3, wherein the rate of the decrease is 0.01 to 10mm/h, and the rate of the decrease in temperature is 1 to 100 ℃/h.
6. The method according to claim 1, wherein the carbon material is carbon powder or graphite powder.
7. The method of claim 1, wherein the vacuum sealing is performed under a vacuum device, and the pressure of the vacuum sealing is less than 5 x 10-3Pa。
8. The method according to any one of claims 1 to 7, wherein the carbon material has a purity of > 99.99%, the cerium bromide powder has a purity of > 99.99%, and the lanthanum bromide powder has a purity of > 99.99%.
9. A lanthanum-cerium bromide crystal shown as a formula (I) is prepared from cerium bromide powder, lanthanum bromide powder and a carbon material, wherein the mass ratio of the lanthanum bromide powder to the cerium bromide powder is x: (1-x);
LaxCe1-xBr3(Ⅰ)；
wherein x is more than 0 and less than 1.
10. The lanthanum cerium bromide crystal according to claim 9, wherein the ratio of the total mass of the cerium bromide powder and the lanthanum bromide powder to the mass of the carbon material is 1: n, 0 is more than 0 and less than 0.01.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101070607A (en) * | 2006-05-10 | 2007-11-14 | 宁波大学 | Novel glittering crystal LaBr3Ce3+ crucible-lowering method growth process |
| US20090296084A1 (en) * | 2008-05-30 | 2009-12-03 | Precision Energy Services, Inc. | Borehole measurements using a fast and high energy resolution gamma ray detector assembly |
| CN107287657A (en) * | 2017-06-26 | 2017-10-24 | 北京中材人工晶体研究院有限公司 | The growing method and gained crystal of a kind of lanthanum bromide scintillation crystal |
-
2018
- 2018-10-26 CN CN201811258259.0A patent/CN111101201A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101070607A (en) * | 2006-05-10 | 2007-11-14 | 宁波大学 | Novel glittering crystal LaBr3Ce3+ crucible-lowering method growth process |
| US20090296084A1 (en) * | 2008-05-30 | 2009-12-03 | Precision Energy Services, Inc. | Borehole measurements using a fast and high energy resolution gamma ray detector assembly |
| CN107287657A (en) * | 2017-06-26 | 2017-10-24 | 北京中材人工晶体研究院有限公司 | The growing method and gained crystal of a kind of lanthanum bromide scintillation crystal |
Non-Patent Citations (1)
| Title |
|---|
| 丁言国: "掺铈溴化镧晶体的生长及其性能的各向异性研究", 《中国优秀硕士学位论文全文数据库》 * |
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