Design of an energetic particle radiation diagnostic spectroscopy system based on national core chips and Qt on Linux in EAST

Zheng, Yingying; Zhang, Zi-Han; Li, Qiang; Cao, Hongchao; Zhang, Yongqiang; Zhao, Jing; Yuan, Q.P.; Xiao, Bingjia; Yan, Lingling; Zhu, Jian-Qiu

doi:10.1007/s41365-021-00906-x

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…Accelerator mass spectrometry (AMS) is an effective and robust technique for studying long-lived actinides (e.g., 236 U, 237 Np, 239 Pu, and 240 Pu) [12,13,14], and inductively coupled plasma mass spectrometry (ICP-MS) is currently the most widely used technique for measuring actinides because of its lower cost compared to AMS. The distribution, sources, migration, and applications of 137 Cs have attracted extensive attention over the past few decades [15,16,17,18,19,20]. 239+240 Pu and 137 Cs in the environment are rapidly and strongly adsorbed by fine soil particles and redistributed within the soil itself [21,22,23].…”

Section: Introductionmentioning

confidence: 99%

First application of plutonium in soil erosion research on terraces

et al. 2023

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The spatial distributions of 239+240Pu and 137Cs in soils from Longji Rice Terraces were investigated to evaluate soil erosion. The activity concentrations of 239+240Pu and 137Cs in the surface soils of the paddy fields were in the range of 0.089–0.734 and 1.80–7.88 mBq/g, respectively. The activities of 239+240Pu and 137Cs showed very similar distribution trends, first increasing and then decreasing with increasing elevation. The 240Pu/239Pu atom ratios in the surface soils ranged from 0.162 to 0.232. The activities of 239+240Pu and 137Cs in the soil cores tended to be uniformly distributed within the plowed layer and declined exponentially below this depth. The mean soil erosion rates of Longji Rice Terraces estimated by 239+240Pu and 137Cs tracer methods were 5.44 t/(ha·a) and 5.16 t/(ha·a), respectively, which demonstrated that plutonium can replace 137Cs as an ideal tracer for soil erosion research in the future. Landform features are the main factors affecting the distribution of plutonium and 137Cs as well as soil erosion in the Longji Rice Terraces.

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Section: Introductionmentioning

confidence: 99%

First application of plutonium in soil erosion research on terraces

et al. 2023

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Development of a wide-range and fast-response digitizing pulse signal acquisition and processing system for neutron flux monitoring on EAST

Cao

Zhao

et al. 2022

NUCL SCI TECH

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The neutron count rate fluctuation reaches six orders of magnitude between the ohmic plasma scenario and high power of auxiliary heating on an experimental advanced superconducting tokamak (EAST). The measurement result of neutron flux monitoring (NFM) is a significant feedback parameter related to the acquisition of radiation protection-related information and rapid fluctuations in neutron emission induced by plasma magnetohydrodynamic activity. Therefore, a wide range and high time resolution are required for the NFM system on EAST. To satisfy these requirements, a digital pulse signal acquisition and processing system with a wide dynamic range and fast response time was developed. The present study was conducted using a field-programmable gate array (FPGA) and peripheral component interconnect extension for instrument express (PXIe) platform. The digital dual measurement modes, which are composed of the pulse-counting mode and AC coupled square integral’s Campbelling mode, were designed to expand the measurement range of the signal acquisition and processing system. The time resolution of the signal acquisition and processing system was improved from 10 to 1 ms owing to utilizing high-speed analog-to-digital converters (ADCs), a high-speed PXIe communication with a direct memory access (DMA) mode, and online data preprocessing technology of FPGA. The signal acquisition and processing system was tested experimentally in the EAST radiation field. The test results showed that the time resolution of NFM was improved to 1 ms, and the dynamic range of the neutron counts rate was expanded to more than $$10^{6}$$ 10 6 counts per second. The Campbelling mode was calibrated using a multipoint average linear fitting method; subsequently, the fitting coefficient reached 0.9911. Therefore, the newly developed pulse signal acquisition and processing system ensures that the NFM system meets the requirements of high-parameter experiments conducted on EAST more effectively.

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Performance of real-time neutron/gamma discrimination methods

Liu

Zhang

et al. 2023

NUCL SCI TECH

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Nuclear security usually requires the simultaneous detection of neutrons and gamma rays. With the development of crystalline materials in recent years, Cs2LiLaBr6 (CLLB) dual-readout detectors have attracted extensive attention from researchers, where real-time neutron/gamma pulse discrimination is the critical factor among detector performance parameters. This study investigated the discrimination performance of the charge comparison, amplitude comparison, time comparison, and pulse gradient methods and the effects of a Sallen–Key filter on their performance. Experimental results show that the figure of merit (FOM) of all four methods is improved by proper filtering. Among them, the charge comparison method exhibits excellent noise resistance; moreover, it is the most suitable method of real-time discrimination for CLLB detectors. However, its discrimination performance depends on the parameters $${t}_\text{s}$$ t s , $${t}_\text{m}$$ t m , and $${t}_\text{e}$$ t e . When $${t}_\text{s}$$ t s corresponds to the moment at which the pulse is at 10% of its peak value, $${t}_\text{e}$$ t e requires a delay of only 640–740 ns compared to $${t}_\text{s}$$ t s , at which time the potentially optimal FOM of the charge comparison method at 3.1–3.3 MeV is greater than 1.46. The FOM obtained using the $${t}_\text{m}$$ t m value calculated by a proposed maximized discrimination difference model (MDDM) and the potentially optimal FOM differ by less than 3.9%, indicating that the model can provide good guidance for parameter selection in the charge comparison method.

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Design of an energetic particle radiation diagnostic spectroscopy system based on national core chips and Qt on Linux in EAST

Cited by 5 publications

References 28 publications

First application of plutonium in soil erosion research on terraces

First application of plutonium in soil erosion research on terraces

Development of a wide-range and fast-response digitizing pulse signal acquisition and processing system for neutron flux monitoring on EAST

Performance of real-time neutron/gamma discrimination methods

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