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System and method for rapidly detecting concentration of 210Po in molten lead bismuth alloy

A liquid lead-bismuth alloy and detection method technology, applied in the field of analysis and detection systems, can solve the problems of easy contamination of detectors, large specific activity, short half-life, etc., and achieve the effects of short analysis process, fast analysis speed and high analysis accuracy

Active Publication Date: 2015-03-11
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Calorimetry is suitable for samples with small volume but large heat release. 210 The radioactivity of Po needs to reach the Curie level in order to obtain better measurement accuracy, and because it takes a long time to reach a stable thermal equilibrium, calorimetric measurement 210 Po also cannot meet the detection requirements of rapid analysis
The sensitivity of α energy spectrum or α counting method is high, but 210 The Po half-life is short and the specific activity is large, so the α energy spectrum or α counting method is usually used to measure 210 Samples with very low Po content
Moreover, the penetrating ability of α particles is weak, and the distance between the sample to be tested and the detector probe cannot be blocked, and close-range open measurement must be carried out. Therefore, the α energy spectrum or α counting method 210 Po also has the problem that the detector is easy to be polluted

Method used

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  • System and method for rapidly detecting concentration of 210Po in molten lead bismuth alloy
  • System and method for rapidly detecting concentration of 210Po in molten lead bismuth alloy

Examples

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Embodiment 1

[0037] Implementation Example 1: The specific implementation of the present invention is given as an example below.

[0038] (1) Use the standard γ source to perform energy calibration and efficiency calibration on the γ detector, and get around 803.1keV, and the detector efficiency is 9.6%;

[0039] (2) Get a small amount of liquid lead-bismuth alloy on a stainless steel plate from the liquid lead-bismuth alloy container, wait for it to cool and solidify naturally, claim its quality as 8.2g;

[0040] (3) Press the solidified lead-bismuth alloy into a uniform sheet with a thickness of 0.5mm with a press, and the sheet with a thickness of 0.5mm can guarantee 210 The characteristic gamma rays emitted by Po fully penetrate;

[0041] (4) Install the solid lead-bismuth alloy thin slice on the gamma detector probe;

[0042] (5) Gamma energy spectroscopy measures the intensity of 803.1keV gamma rays in solid lead-bismuth alloy flakes, and 1126 gamma rays are detected in 600 seconds...

Embodiment 2

[0056] Implementation example 2: The accuracy estimation of the application of the present invention in the primary loop coolant medium of the lead-bismuth fast reactor is given below.

[0057] (1) After the lead-bismuth fast reactor runs stably, in the coolant medium of the primary circuit 210 The total activity of Po is about 10 14 Bq (there are some differences in lead-bismuth fast reactors with different neutron flux densities and scales);

[0058] (2) The lead-bismuth fast reactor liquid lead-bismuth alloy coolant capacity is about 1000 tons, according to the given in step 1 210 Po total activity, in liquid lead-bismuth alloy 210 The average radioactive concentration of Po is about 10 5 Bq / g;

[0059] (3) The sampling amount of the sample is calculated according to 10g, 210 The branch ratio of Poγ decay is one in 100,000, and it is estimated that 10g of liquid lead-bismuth alloy emits 10 photons per second on average;

[0060] (4) Taking the NaI crystal gamma probe ...

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Abstract

The invention relates to a system and method for rapidly detecting the concentration of 210Po in a molten lead bismuth alloy. By measuring a characteristic gamma ray generated during 210Po decay, the content of 210Po in the molten lead bismuth alloy is quantitatively analyzed. The system and the method which are simple in principle and high in operability are provided for analyzing and detecting the concentration of 210Po, and the system and the method are applicable to rapid detection on the concentration of 210Po in a coolant of a fast reactor primary coolant circuit taking molten lead bismuth alloy as a coolant.

Description

technical field [0001] The present invention relates to an analysis and detection system and method, through gamma ray energy spectrum analysis, to realize the liquid lead-bismuth alloy 210 Rapid detection of Po concentration. Background technique [0002] In a fast neutron reactor with liquid lead-bismuth alloy as the coolant, neutron irradiation of bismuth will produce 210 Po, because 210 Po is extremely toxic. During the operation or decommissioning of the reactor, it is necessary to treat the reactor pressure vessel and the primary circuit 210 Po is extracted and separated, resulting in liquid lead-bismuth alloy 210 Analysis and detection requirements of Po. [0003] 210 Po has a strong alpha radiation with a half-life of 138.3 days. 210 Traditional analytical detection methods for Po include calorimetry, alpha spectroscopy or alpha counting. Calorimetry is suitable for samples with small volume but large heat release. 210 The radioactivity of Po needs to reach t...

Claims

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Application Information

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IPC IPC(8): G01T1/167
Inventor 王海霞梅华平党同强
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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