The thickness of the thin film is only 1 micrometer, and the key technology of the neutron detector, boron carbide thin film, has been successfully developed in Dongguan

Southern Finance and Economics All Media Reporter Cheng Hao reports from DongguanThe picture shows a high-performance large-area boron carbide thin film sample developed by the Chinese spallation neutron source team (provided by the interviewed unit)The China Spallation Neutron Source, located in the Songshan Lake Science City in Dongguan, is known as the "super microscope" for observing the microscopic world, and the neutron detector is like the "eye" of this large scientific device, used to discover the microstructure of the sample.Currently, neutron detectors based on boron conversion have become a hot research topic internationally due to their excellent performance

Southern Finance and Economics All Media Reporter Cheng Hao reports from Dongguan

The picture shows a high-performance large-area boron carbide thin film sample developed by the Chinese spallation neutron source team (provided by the interviewed unit)

The China Spallation Neutron Source, located in the Songshan Lake Science City in Dongguan, is known as the "super microscope" for observing the microscopic world, and the neutron detector is like the "eye" of this large scientific device, used to discover the microstructure of the sample.

Currently, neutron detectors based on boron conversion have become a hot research topic internationally due to their excellent performance. With the upcoming launch of the second phase of the China Spallation Neutron Source (CSNS) project, the proposed neutron spectrometer urgently needs new neutron detectors with large area, high efficiency, and position sensitivity.

It is understood that how to prepare high-performance neutron conversion boron carbide thin films is the most core technology among them, and currently only a few developed countries such as the United States and Europe have mastered this technology.

In 2016, with the support of the State Key Laboratory of Nuclear Detection and Nuclear Electronics, the China Spallation Neutron Source (CSNS) detector team, in cooperation with Professor Zhu Jingtao of Tongji University, began to develop a special device for magnetron sputtering large-area boron plating, with a coating thickness ranging from 0.01 to 5 microns. It also supports single and double side coating, radio frequency and DC coating.

In June 2021, the device passed the acceptance of the key laboratory and was put into use.

After years of technical research and process trial production, the team has overcome key technologies that have a significant impact on the coating quality, such as sputtering target material production, transition layer selection, and substrate surface treatment. Using this device, various specifications of boron carbide thin films have been prepared and successfully applied to ceramic GEM neutron detectors on multiple neutron spectrometers in China's spallation neutron source, achieving the localization of key neutron detector technologies and devices, This provides strong technical support for the development of new high-performance neutron detectors with larger areas in the future.

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