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Neodymium-doped lanthanum bromide single crystal flash body and preparing method thereof

A single crystal scintillator, neodymium lanthanum bromide technology, applied in the field of neodymium-doped lanthanum bromide single crystal scintillator and its preparation, can solve the problems of poor response to low-energy rays, easy deliquescence, easy cracking, etc.

Inactive Publication Date: 2012-06-20
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of crystal also has some inherent defects, such as easy cracking and deliquescence during the growth process, the luminescent region is mainly located in the ultraviolet, and poor response to low-energy rays. [2]

Method used

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  • Neodymium-doped lanthanum bromide single crystal flash body and preparing method thereof
  • Neodymium-doped lanthanum bromide single crystal flash body and preparing method thereof
  • Neodymium-doped lanthanum bromide single crystal flash body and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1 Preparation of Nd-doped Lanthanum Bromide Single Crystal Scintillator

[0022] The preparation method of neodymium-doped lanthanum bromide single crystal scintillator is carried out according to the following steps:

[0023] (1) In a dry glove box, LaBr 3 with NdBr 3 Move into a quartz crucible after being mixed with a mass ratio of 98:2 and vacuumize and package;

[0024] (2) After the Bridgman method is used for growth, cutting, grinding and polishing, the crystals are temporarily stored in liquid paraffin to obtain Nd-doped lanthanum bromide crystals, which are ready for crystal encapsulation. The growth process of the Bridgman method is as follows: the single crystal growth furnace is divided into two temperature zones in the vertical direction, and the upper half is a high temperature zone, which should generally be higher than the melting point of the raw material by 50°C, so that the raw material is easy to absorb heat and melt. The lower half is ...

Embodiment 2

[0028] Embodiment 2 Determination of properties of neodymium-doped lanthanum bromide single crystal scintillator

[0029] When measuring scintillation properties such as light output and energy resolution, a Hamamatsu R6233-100 photomultiplier tube is used. The output of the photomultiplier tube passes through the preamplifier and linear amplifier in turn, and enters the multi-channel card. It is displayed on the channel program; when measuring the luminous decay time, a Hamamatsu XP2020Q photomultiplier tube is used, and the output of the photomultiplier tube is directly connected to a digital oscilloscope and displayed on the oscilloscope screen.

[0030] Figure 2 to Figure 5 followed by LaBr 3 :2%NdBr 3 (Nd-doped lanthanum bromide single crystal scintillator prepared in Example 1) scintillation spectrum shape, time decay curve, energy linearity and ultraviolet fluorescence emission spectrum. Table 1 summarizes it and compares it with LaBr 3 :8% CeBr 3 The correspondin...

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Abstract

The invention discloses a neodymium-doped lanthanum bromide single crystal flash body and a preparing method thereof, which belong to the technical field of ray detection of inorganic flash bodies. The structure of the flash body is that light reflection materials are wound on the upper face and the lateral face of neodymium-doped lanthanum bromide crystal, an aluminum sheet is wrapped on the outside of the light reflection materials, quartz glass sheets are arranged on the bottom faces of the light reflection materials, and quartz glass sheets, the neodymium-doped lanthanum bromide crystal and the aluminum sheet are firmly adhered through transparent liquid glue. The neodymium-doped lanthanum bromide single crystal flash body can improve a LaBr3: Ce3+light-emitting area and enables the LaBr3: Ce3+light-emitting area to extend towards the long wave direction so that a photomultiplier responsive to the long wave is better matched with the LaBr3: Ce3+light-emitting area.

Description

technical field [0001] The invention belongs to the technical field of ray detection of inorganic scintillators, and in particular relates to a neodymium-doped lanthanum bromide single crystal scintillator and a preparation method thereof. Background technique [0002] LaBr 3 : Ce 3+ The rare earth-doped lanthanum halide single crystal is a new type of inorganic scintillator that emerged in the early 21st century, and its excellent energy characteristics and time characteristics are significantly better than traditional scintillators such as NaI(Tl) and CsI(Na). [1] . However, this type of crystal also has some inherent defects, such as easy cracking and deliquescence during the growth process, the luminescent region is mainly located in the ultraviolet, and poor response to low-energy rays. [2] . LaBr 3 : Ce 3+ The main emission peaks of the ultraviolet fluorescence emission spectrum of the scintillator are 355nm and 385nm, both of which are located in the ultraviolet...

Claims

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Application Information

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IPC IPC(8): B32B9/04B32B15/20B32B17/00B32B27/04B32B27/30B32B7/12C09K11/85G01T1/202C30B11/00C30B29/12
Inventor 高鑫何元金
Owner TSINGHUA UNIV
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