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Method for measuring potassium 40 in environment via lanthanum bromide detector

A detector, lanthanum bromide technology, applied in the field of radiation detection and radiation environment monitoring, can solve problems such as inability to use

Active Publication Date: 2016-11-16
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

For this reason, it is generally accepted that lanthanum bromide detectors cannot be used to measure 40 K activity

Method used

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  • Method for measuring potassium 40 in environment via lanthanum bromide detector
  • Method for measuring potassium 40 in environment via lanthanum bromide detector
  • Method for measuring potassium 40 in environment via lanthanum bromide detector

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Embodiment Construction

[0046] The content of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] A kind of Potassium 40( 40 K) methods such as Figure 4 As shown, the method includes the following steps:

[0048] 1) Calibrate the radioactivity of the lanthanum bromide detector itself, and obtain the background spectrum response y of the detector:

[0049] exist 138 In the region of interest of the 1440keV and 1472keV full energy peaks of La, the self-radioactivity of the lanthanum bromide detector forms three γ full energy peaks, which are 138 The 1440keV, 1472keV full-energy peaks of La and the lanthanum bromide detector itself contain 40 The 1461keV full-energy peak of K, using three Gaussian functions to express the background spectral response of the lanthanum bromide detector's own radioactivity in the region of interest as:

[0050] y=H 1 ·N(μ 1 ,σ 1 )+H 2 ·N(μ 2 ,σ 2 )+H 3 ·N(μ 3 ,σ 3 ) (1)

[0051] Among...

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Abstract

The invention puts forward a method for measuring potassium 40 in environment via a lanthanum bromide detector and belongs to the field of radiation detection and radiation environment monitoring methods. The method comprises the following steps: radioactivity of the lanthanum bromide detector is calibrated, a background spectrum response y of the detector is obtained, the lanthanum bromide detector is used for measuring 40K in the environment, an energy spectrum response y* can be obtained via fitting operation, and activity of 40K in the environment can be calculated according to the background spectrum response y of the lanthanum bromide detector and the energy spectrum response y*. The method disclosed in the invention can be used for precisely measuring 40K in the environment.

Description

technical field [0001] The invention belongs to the field of radiation detection and radiation environment monitoring methods, in particular to measuring potassium 40 ( 40 K) method. Background technique [0002] Ce-doped lanthanum bromide (LaBr 3 :Ce) has great performance: [0003] 1. High atomic number (effective atomic weight is 46.9 close to 50 of sodium iodide), high density (density 5.29g / cm 3 Greater than 3.67g / cm of sodium iodide 3 ), so that it has a higher intrinsic detection efficiency; [0004] 2. The energy resolution is good (the best can reach 2.6%@662keV), and its energy resolution is close to the statistical limit of the scintillator Poisson distribution, indicating that the nonlinearity of the light yield has much less impact on the resolution than other the scintillator; [0005] 3. Good time resolution (hundreds of picoseconds); [0006] 4. The output spectrum matches the commonly used photocathode. [0007] At present, cerium-doped lanthanum bro...

Claims

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Application Information

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IPC IPC(8): G01T1/202
CPCG01T1/202
Inventor 曾志潘兴宇程建平马豪曾鸣李君利
Owner TSINGHUA UNIV
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