A simple gas ionization chamber design for low energy ions measurements.

Prof. Hongtao Shen1,2, Shulin Shi1, Junsen Junsen Tang1, Li Wang1, Yingge Wang1,3, Guofeng Zhang1

1Guangxi Normal University, Guilin, China, 2Guangxi key laboratory of nuclear physics and technology, Guilin, China, 3Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University, zhuhai, China

A simple single anode gas ionization chamber (GIC) design for low energy ions was developed for the small accelerator mass spectrometer (GXNU-AMS) at Guangxi Normal University. This detector consists of a 50nm silicon nitride window, an anode, a Frisch grid, and a cathode. To find optimal measurement conditions and to characterize the detector performance in the low energy, the test experiments have been performed with ions of 3H and 14C in the energies range from 15keV to 250 keV, and the dependence of energy resolution and charge output per unit particle energy of the projectile is investigated and parametrized. As a result, Tritiums below 20 keV were measured with a resolution better than 3 keV, radiocarbons below 50 keV were measured with a resolution better than 10 keV, and good linearity of the particle energy and detector signal was found in the energy range between 50 and 250keV. Also, the low energy performance of GIC is compared to that of the Surface Barrier Detector and proves that GICs are more suitable for measuring ions at extremely low energy, which meets the requirements for 3H and 14C measurements at GXNU-AMS.


Hongtao Shen is a professor of Nuclear Physics and Technology at Guangxi Normal University, China, a member of the International Radiocarbon Scientific Committee, and a Member of the East Asia International Accelerator Mass Spectrometry (EA-AMS) Academic Committee. Previously he was a researcher at the University of Tsukuba, Japan. His research lies in the accelerator mass spectrometry and its application research work. He has published >30 peer-reviewed papers in leading journals such as Physical Review C, Scientific Reports, NIMB, Radiocarbon. He is now in charge of the construction of Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology in Guangxi, China.

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