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A radiochemical analysis, sr-90 technology, applied in the direction of radiation measurement, measuring devices, instruments, etc., can solve the problems of long process time, not suitable for rapid measurement of contaminated samples in the near future, and many operating steps
Inactive Publication Date: 2013-10-09
CHINA INSTITUTE OF ATOMIC ENERGY
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It can be seen that both the rapid method and the placement method have the disadvantages of many operation steps and long process time, and are not suitable for a large number of environmental soil samples. 90 requirements for Sr analysis; in addition, the above method also assumes 90 Sr and its daughters 90 Y has reached equilibrium, through daughter 90 Y indirect measurement 90 Sr, not suitable for rapid measurement of recently contaminated samples
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Embodiment 1-3
[0050] The specific analysis method is as follows:
[0051] 1) Soil sample pretreatment:
[0052] Take 10g of contaminated soil samples in a 100mL porcelain crucible, add 0.1g of strontium carrier solution with a concentration of 100mg / g (i.e. containing 10mg Sr 2+ Carrier), in triplicate in parallel, the sample numbers are 1#, 2#, 3#, corresponding to Examples 1, 2, and 3, fired in a muffle furnace at 600° C. for 1 hour, and cooled.
[0053] Transfer the burnt soil sample to a 1000mL distillation flask with a water condenser, add 140mL6mol / L hydrochloric acid, heat and boil for 1h, cool and centrifuge, collect the supernatant in a 500mL beaker, and wash with 40mL1mol / L hydrochloric acid The residue was collected once, the supernatant and washing solution were combined, and the residue was discarded.
[0054] 2) Concentration of strontium and yttrium by oxalic acid precipitation:
[0055] Add 10g of oxalic acid to the combined solution in step 1), heat to dissolve, adjust t...
Embodiment 4-5
[0070] Get two parts of slightly polluted soil samples close to the background, the sample numbers are 4# and 5#, corresponding to Examples 4 and 5, the consumption of dry Sr.spec is 3g, and other specific operation steps are the same as Examples 1-3. The analysis results are listed in Table 1.
[0071] Table 1
[0072]
[0073] Above-mentioned embodiment adopts the method provided by the invention to analyze the soil sample with different degree of pollution, obtains in the sample 90 The content of Sr was compared with the quick method in the nuclear industry industry standard, and the two were consistent within 5% error range. The chemical yield of Sr in the whole process is about 60%, and the analysis time is less than 12h.
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Abstract
The invention relates to a radiochemical analyzing method of Sr-90 in soil. The radiochemical analyzing method of the Sr-90 in soil comprises the following steps that 1, pretreatment of soil samples is conducted; 2, sediment and concentration of strontium and yttrium are conducted by oxalic acid; 3, oxalate sediments are dissolved by nitric acid; 4, Sr-90 is separated by resin columns: strontium resin is soaked by distilled water and packed into columns in a wet-process mode, clear liquid obtained in step 3 flows through the resin columns, elution is conducted, desorption is conducted, and desorption solution is collected; 5, chemical yield measurement: sediment of strontium in the desorption solution is conducted by oxalic acid, and the strontium is washed and dried to achieve constant weight; 6, liquid flash measurement is conducted: the sediment is dissolved by nitric acid, liquid flash liquid is added to measure the belta factor; 7, radioactive activity of 90Sr-90Y in soil is calculated. The radiochemical analyzing method of the Sr-90 in soil can rapidly analyze the 90Sr content in soil samples in a radiochemical mode, the chemical yield of the 90Sr is about 60 percent during the whole process, analyzing time is less than 12 hours, the minimum detectable activity is 2 Bq/kg, and when the minimum detectable activity is compared with the industrial standard (EJ/T1035-1996) in the express method, and the minimum detectable activity and the industrial standard are consistent within the 5% error range.
Description
technical field [0001] The invention belongs to the technical field of nuclide detection in soil, and in particular relates to a radiochemical analysis method for Sr-90 in soil. Background technique [0002] Sr-90 (ie 90 Sr) is an important fission product, which belongs to pure β emitter, has the characteristics of high yield and long life, and is a highly toxic osteophilic nuclide. 90 Sr is the most concerned radionuclide in environmental monitoring, but it will be interfered by other impurity nuclides during radioactivity measurement, and radiochemical separation is often required. In samples such as water, plant ash and urine 90 There have been many reports on the radiochemical analysis methods of Sr at home and abroad. Due to the complex soil sample system, the content of calcium, magnesium, iron and other elements is much higher than that of strontium, and there are also uranium, radium, thorium, potassium and their decay daughter nuclides 90 Y and various artifici...
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