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Low background radiation level stainless steel plates and bars Hay:A02TGJT

Recently, TGJT Stainless Steel Technology Corporation provided nearly 2,000 tons of low-background stainless steel plates and bars to the Guangdong Jiangmen Neutrino Project of the Chinese Academy of Sciences for the production of the main structure of the experimental station.


Jiangmen Neutrino Experiment Station is the second large-scale neutrino experimental project hosted by China after the Daya Bay Neutrino Experiment. It is a major scientific experimental project for high-energy physics research in China.


Construction of the project started in 2015 and is expected to be completed in 2022. The experimental station is built at a depth of 700 meters underground. The goal is to use the neutrino oscillation of the reactor to determine the mass sequence of neutrinos, which is of great significance for mankind to understand the basic microscopic structure of matter and the origin and evolution of the universe.


The key device of the experimental station is the detector located in the glass sphere inside the spherical reticulated shell of the stainless steel main structure. The detector is the world's most accurate and largest liquid scintillation detector. In order to ensure the accuracy and sensitivity of the detector, the detector is supported by a stainless steel main structure spherical reticulated shell and placed in the center of a huge pool, surrounded by water to shield the background of the surrounding environment.


Background refers to a way of characterizing the radioactivity of an object itself. The lower the background, the lower the radioactivity. After the spherical reticulated shell is completed, it will be the largest stainless steel spherical reticulated shell structure in the world and the first large-scale stainless steel structure in China.

In order to control the background level of the device itself, the steel for the spherical reticulated shell must be made of corrosion-resistant stainless steel, which requires a low content of radioactive elements.


Experts from the Institute of High Energy Physics, Chinese Academy of Sciences are responsible for the project design. After a systematic evaluation of the background levels of various stainless steel manufacturers in China, the evaluation results show that the background of TGJT's nuclear-grade stainless steel is relatively low.


For each batch of products produced by TGJT, samples are sent to China High Energy Physics for background testing, and the heats that pass the test are used as special blanks for steel plates and bars for neutrino projects. Through careful organization of smelting, the background level has been well controlled, and the requirements of the neutrino project steel plate contract for unit weight, contract volume, batch-to-batch consistency, stability and other aspects have been met, and the supply task has been successfully completed.

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