On August 24, Japan opened the discharge of wastewater contaminated by the Fukushima nuclear accident into the Pacific Ocean. Currently, based on the public data of TEPCO in June 2023, the sewage prepared to discharge mainly contains: the activity of H-3 is about 1.4 x10⁵Bq / L; the activity of C-14 is 14 Bq / L; I-129 is 2 Bq / L; the activity of Co-60, Sr-90, Y-90, Tc-99, Sb-125, Te-125m and Cs-137 is 0.1-1 Bq / L. In this regard, we focus not only on the tritium in nuclear waste water, but also on the potential risks of other radionuclides. TepCO only disclosed the total α and total β radioactive activity data of contaminated water, and did not disclose the concentration data of extremely toxic ultra-uranium nuclides such as Np-237, Pu-239, Pu-240, Am-240, Am-241, Am-243 and Cm-242, which is also one of the key safety risks for the discharge of nuclear contaminated water into the sea.
Environmental radiation pollution is a hidden pollution, once produced will have a bad impact on the surrounding residents. In addition, if the biological or transmission media around the radioactive source are contaminated by radionuclide, it can be transmitted from low level to high level through the food chain and continuously enriched in the transmission process. Once these radioactive pollutants enter the human body through food, they can accumulate in the human body, which may have an impact on human health.
In order to reduce or avoid the harm of radiation exposure to the public and protect public health to the maximum extent, the "International Basic Safety Standards for Radiation Protection and Radiation Source Safety" stipulates that the competent authorities formulate the reference level for radionuclides in food.
In China, relevant standards have been formulated for the detection of several common radionuclids. The standards for the detection of radioactive substances in food include GB 14883.1~10- -2016 "National Standard for Food Safety: Determination of radioactive substances in Food" and GB 8538- -
2022 "National Standard for Food Safety Drinking Natural Mineral Water", GB / T 5750.13- -2006 "Radioactive Index for Standard Inspection Methods for Drinking Water", SN / T 4889- -2017 "Determination of γ Radionuclide in Export High-salt Food", WS / T 234- -2002 "Measurement of Radioactive Substances in Food-241", etc
The radionuclide detection methods and measuring equipment in food common in the standards are as follows:
|
Analyze the project |
analytical equipment |
Other special equipment |
standard |
|
α, β gross activity |
Low background α, β counter |
GB / T5750.13- -2006 Radioactive Index of Standard Test Methods for Domestic and Drinking Water |
|
|
tritium |
Low-background liquid scintillation counter |
Organotritium-carbon sample preparation device; Triitium concentration gathering device in water; |
GB14883.2-2016 Determination of Radioactive Material Hydrogen-3 in Food, National Standard for Food Safety |
|
Strontium-89 and strontium-90 |
Low background α, β counter |
GB14883.3-2016 Determination of Strr-89 and Strr-90 in the National Standard for Food Safety |
|
|
Adventitia-147 |
Low background α, β counter |
GB14883.4-2016 Determination of Radioactive Substances in Food-147, National Standard for Food Safety |
|
|
Polonium-210 |
α spectrometer |
Electric sediments |
GB 14883.5-2016 Determination of Polonium-210 in the National Standard for Food Safety |
|
Rum-226 and radium-228 |
Radon Thorium Analyzer |
GB 14883.6-2016 National Food Safety Standards |
|
|
Natural thorium and uranium |
Spectrophotometer, trace uranium analyzer |
GB 14883.7-2016 Determination of Natural Thorium and Uranium as Radioactive Materials in the National Standard for Food Safety |
|
|
Plutonium-239, plutonium-24 |
α spectrometer |
Electric sediments |
GB 14883.8-2016 Determination of plutonium-239 and plutonium-240 radioactive substances in the National Standard for Food Safety |
|
Iodine-131 |
High purity germanium γ spectrometer |
GB 14883.9-2016 Determination of Iodine-131 in Food, National Standard for Food Safety |
product recommendation
measuring equipment
Low-background αβ counter
Brand: kernel machine
Model number: RJ 41-4F
Product profile:
Flow type low background α, β measuring instrument is mainly used for environmental samples, radiation protection, medicine and health, agricultural science, import and export commodity inspection, geological exploration, nuclear power plant and other fields in water, biological samples, aerosol, food, medicine, soil, rock and other media in the total α total β measurement.
The thick lead shielding in the measurement room ensures very low background, high detection efficiency for low radioactive activity samples, and 2,4,6,8,10 channels can be customized.
High-purity germanium γ energy spectrometer
Brand: kernel machine
Model number: RJ 46
Product profile:
RJ 46 digital high purity germanium low background spectrometer mainly includes the new high purity germanium low background spectrometer. The spectrometer uses the particle event readout mode to obtain the energy (amplitude) and time information of the output signal of the HPGe detector and store it.
α spectrometer
Brand: kernel machine
Model number: RJ 49
Product profile:
Alpha energy spectroscopy measurement technology and instruments have been widely used in environmental and health evaluation (such as thorium aerosol measurement, food inspection, human health, etc.), resource exploration (uranium ore, oil, natural gas, etc.) and geological structure exploration (such as groundwater resources, geological subsidence) and other fields.
RJ 494-channel Alpha spectrometer is a PIPS semiconductor instrument independently developed by Shanghai Renji Instrument Co., Ltd. The spectrometer has four α channels, each of which can be measured simultaneously, which can greatly shorten the time cost of the experiment and quickly obtain the experimental results.
Low-background liquid scintillation counter
Brand:HIDEX
Model number: 300SL-L
Product profile:
Liquid scintillation counter is a kind of highly sensitive instruments mainly used for accurate measurement of radioactive α and β nuclides in liquid media, such as radioactive tritium, carbon-14, iodine-129, strontium-90, ruthenium-106 and other nuclides.
Water radium analyzer
Brand:PYLON
Model: AB7
Product profile:
The Pylon AB7 Portable Radiological Monitor is the next generation of laboratory level instruments that provide rapid and accurate measurement of radon content.
Other special equipment
Triitium concentration gathering device in water
Brand: Yi Xing
Model number: ECTW-1
Product profile:
The concentration of tritium in seawater is relatively low, even the best detection equipment can not be measured, therefore, the samples with low background need to be pretreatment, that is, electrolysis concentration method. The ECTW-1 tritium electrolytic collector produced by our company is mainly used for electrolytic concentration of tritium in low level water, which can concentrate tritium samples below the detection limit of liquid flash counter until it can be accurately measured.
Organotritium-carbon sample preparation device
Brand: Yi Xing
Model number: OTCS11 / 3
Product profile:
OTCS11 / 3 Organic tritium carbon sampling device uses the principle of organic samples under high temperature oxidation combustion in high temperature aerobic environment to generate water and carbon dioxide, to realize the production of tritium and carbon-14 in biological samples, convenient for subsequent treatment, liquid scintillation counter to measure the activity of tritium and carbon-14.
Electric sediments
Brand: Yi Xing
Model number: RWD-02
Product profile:
RWD-02 is a α spectrometer developed by Shanghai Yixing Electromechanical Equipment Co., Ltd. based on years of sample pretreatment experience. It is designed for the preparation of α energy spectrum analysis samples, and is suitable for nuclear medicine and radioisotope research and application field.
α spectrometer is one of the essential equipment of radiation analysis laboratory and can analyze nuclides with α decay. If it is important to obtain accurate analytical results, a very important step is to make the samples. RWD-02 electrodeposition er is simple to operate, which greatly simplifies the process of sample making, making two samples at one time and improving the efficiency of sample preparation.
Post time: Oct-31-2023