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Rapid detection method for radioactive caesium in aquatic product

A detection method, a technology for aquatic products, applied to measuring devices, material analysis using wave/particle radiation, instruments, etc., can solve the problems of limited accuracy, long detection time, low detection efficiency, etc., and achieve high accuracy and detection Short time consumption and improved detection accuracy

Inactive Publication Date: 2019-06-11
XIAMEN UNIV TAN KAH KEE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing gamma energy spectrum analysis method has the following disadvantages: the detection time is long, the total time is more than 50 hours, and the detection efficiency is low; the accuracy is limited, and the lowest detection limit is about 2 orders of magnitude higher than the total α and total β measurement

Method used

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  • Rapid detection method for radioactive caesium in aquatic product
  • Rapid detection method for radioactive caesium in aquatic product
  • Rapid detection method for radioactive caesium in aquatic product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: The fresh sample method is used to detect radioactive cesium on frozen albacore tuna.

[0056] A rapid detection method for radioactive cesium in aquatic products, comprising: (1) selected instruments and equipment, (2) background measurement, (3) standard source preparation, (4) sample preparation, (5) sample measurement, (6) Calculation and analysis of test results;

[0057] The instruments and equipment selected in step (1) include: HPGe-γ spectrometer, produced by Ortec Corporation of the United States, with an energy resolution of 1.75keV@1332.5keV, and a relative efficiency ≥ 65%; 2L Marlin cup, made of polyethylene, produced by PE company; electronic balance: produced by Swiss METTLER TOLEDO company, PL3002-IC type with a maximum capacity of 3100g and a minimum division of 0.01g; shielded room: lead equivalent to not less than 100mm In the shielding room, the inner cavity of the shielding room is larger than 40cm×40cm×50cm, and the inner surface of th...

Embodiment 2

[0091] Example 2: The ash sample method is used to detect radioactive cesium in frozen albacore tuna.

[0092]In order to verify the accuracy of the fresh sample method γ-ray spectroscopy analysis results, the gray sample method was used to detect radioactive cesium in frozen albacore tuna (this method is an existing detection technology, and the detailed steps are not described in detail, but only briefly described).

[0093] Apparatus and equipment used: resistance furnace, muffle furnace, polyethylene measuring box, X-ray fluorescence spectrometer (manufactured by Swiss ARL company, ARL9900XP type).

[0094] Step 1: Take the fresh sample of frozen albacore tuna prepared simultaneously in Example 1, dry, cool, and mash;

[0095] Step 2: Carbonize the crushed sample on a resistance furnace (avoid open flames to avoid sample loss), then transfer it to a muffle furnace for ashing at a temperature of 450°C for 10 hours until the sample ash is off-white;

[0096] Step 3: Collect...

Embodiment 3

[0102] Embodiment 3: The fresh sample method is used to detect radioactive cesium on red sea bream.

[0103] The operation steps and the equipment used in the third embodiment are the same as those in the first embodiment, and the third embodiment is to detect the radioactive cesium of red sea bream (the detailed operation steps will not be repeated).

[0104] After thawing the red sea bream sample, remove the gills, cut the belly and remove the intestines, shave the edible part, put it into a 2L Marlin cup until it is nearly full, firm, and weigh 1398.00g; use HPGe-γ spectrometer to analyze The red sea bream sample was tested, and the measurement time was set to 6 hours; the measurement results were as follows Figure 5 As shown, the calculation was carried out to obtain the fresh sample method to detect the 137 The detection results of Cs are shown in Table 3.

[0105]

[0106] Table 3: Red sea bream 137 Cs test results

[0107] As can be seen from Table 3, the red se...

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Abstract

The invention provides a rapid detection method for radioactive caesium in an aquatic product, which belongs to the field of detection of aquatic products. The detection method can rapidly, efficiently and accurately detect the content of radioactive caesium in the aquatic product. The rapid detection method comprises the following steps: (1) selecting instruments and devices; (2) measuring a background; (3) preparing a standard source; (4) preparing a sample; (5) measuring the sample; and (6) calculating and analyzing a detection result. A fresh-sample HPGe-gamma energy spectrum efficiency curve fitting analysis method is adopted to detect the radioactive caesium, the sample preparation is simple, the analysis result is reliable, and the accuracy is high; and by adopting a fresh sample for detection, the sample does not need the ashing treatment, so that compared with the existing detection method, the detection time is greatly shortened, a sufficiently-low minimum detection limit canbe obtained, the requirement of efficiency and accuracy can be met when in emergency detection, the detection time is short, and the efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of aquatic product detection, in particular to a rapid detection method for radioactive cesium in aquatic products. Background technique [0002] The radioactive substances that cause radioactive contamination to food mainly fall into two categories: natural radioactive substances and artificial radioactive substances. Since the distribution of natural radioactive substances in nature is very scattered, it is difficult to form a high concentration enrichment in food under natural conditions, and the probability of contamination of food by artificially enriched natural radioactive substances is very small, so food Radioactive contamination Artificial radioactive material considered in most cases. [0003] The sources of artificial radioactive substances mainly include atmospheric or underground nuclear tests, nuclear power plants and other nuclear reactors, releases under normal operation or accident conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/223G01N23/2202
Inventor 马嫱
Owner XIAMEN UNIV TAN KAH KEE COLLEGE
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