Xiangdong Ruan’s research while affiliated with Guangxi University and other places

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Publications (23)


Exposure age dating of Chinese tiankengs by 36Cl-AMS
  • Article

November 2019

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24 Reads

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8 Citations

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

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Qi Meng

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The Guangxi Zhuang Autonomous Region in southern China is one of the most typical karst relief areas with various forms, and tiankeng is one of the most typical karst relief forms of the Quaternary Period. In this work, accurate measurements of tiankeng exposure ages were made. The exposure ages of carbonate rocks from the five largest tiankengs in the world, the DaShiwei, HuangJing, ChuanDong, DaTuo, and DaCao tiankengs, were determined by accelerator mass spectrometry to be at least 20–400 thousand years, which provides significant proof for activity of new tectonic movement of the Eurasian continent in the Quaternary.


Distribution and sources of plutonium along the coast of Guangxi, China

October 2018

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53 Reads

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22 Citations

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

Concentration and transport pathways of plutonium in the marine environment play an important role to assess the radioactivity as well as the ecological influence. In order to obtain the results of plutonium concentration from main sources along the coast of Guangxi, surface soil samples and sediment core were analyzed by ICP-MS. The results indicated that the concentration of ²³⁹⁺²⁴⁰Pu in the surface soils and sediments are in the range of 0.136–0.272 and 0.088–0.469 Bq/kg, respectively. The ratios of ²⁴⁰Pu/²³⁹Pu are in the range of 0.171–0.198, which coincides with the value of contribution of the global fallout. The sedimentation rate of Sanniang Bay (sample no. SN2) were measured by excess ²¹⁰Pb, ¹³⁷Cs and ²³⁹⁺²⁴⁰Pu, respectively.


Study on 41Ca-AMS for diagnosis and assessment of cancer bone metastasis in rats

June 2015

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25 Reads

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6 Citations

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

The annual incidence of new cancer patients in China is about 2 million, 30-40% of which will end up with bone metastasis. Profound study on the preclinical model and early diagnosis of cancer bone metastasis in rats are very significant for the drug development, better understanding and treatment of bone metastases. In order to monitor the process of bone metabolism and early detection of bone metastasis of cancer cells, a technique of 41Ca isotope tracer combined with AMS has been developed and applied in the study on the bone metastasis of cancer cells by rat model. In this work, 3-month-old female Sprague-Dawley (SD) rats were randomly divided into different groups, and tumor cells injected respectively into the tail vein, femoral artery, femoral cavity and the thigh muscle to establish the rat models for bone metastases. The most appropriate model, i.e., the thigh muscle group, was finally adopted in our real metastases experiment. Each rat in this group was intramuscularly (i.m.) injected with 250 μl CaCl2 solution (containing 1.4 mg Ca and 5nCi 41Ca). About 40 days later, the rat mammary gland carcinoma cells (Walker 256) were injected into these rats following the established protocol. After bone metastasis, medicine interventions were performed. The sequential urine and blood samples were collected and analyzed for 41Ca (by AMS) and N-terminal telopeptide (Ntx), respectively. Bone Mineral Density (BMD) values in the femur and the tibia were measured by CT scan. The results of 41Ca/Ca in longitudinal urinary samples can sensitively reveal the skeletal perturbations caused by bone metastasis of rats, suggests that 41Ca might be similarly developed for human use and improve clinical management through the assessment of the curative effect and non-invasive detection of the earliest stages of cancer growth in bone.


Measurement of 59Ni and 63Ni by accelerator mass spectrometry at CIAE

April 2015

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46 Reads

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2 Citations

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

The long lived isotopes 59Ni and 63Ni can be used in many areas such as radioactive waste management, neutron dosimetry, cosmic radiation study, and so on. Based on the large accelerator and a big Q3D magnetic spectrometer, the measurement method for 59Ni and 63Ni is under development at the AMS facility at China Institute of Atomic Energy (CIAE). By using the ΔE-Q3D technique with the Q3D magnetic spectrometer, the isobaric interferences were greatly reduced in the measurements of 59Ni and 63Ni. A four anode gas ionization chamber was then used to further identify isobars. With these techniques, the abundance sensitivities of 59Ni and 63Ni measurements are determined as 59Ni/Ni = 1 × 10−13 and 63Ni/Ni = 2 × 10−12, respectively.


Evidences for the view of the importance of Hepu seaport in ancient China

January 2013

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73 Reads

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1 Citation

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

Two ancient tombs considered belonging to the Han Dynasty (206 BC to AD 220), were excavated in Hepu, Guangxi Zhuang Autonomous Region, China. According to the style of cultural relics, some excavated artifacts did not come from the region. If the age of the tombs can be confirmed as belonging to the Han Dynasty, the exotic artifacts present significant evidence to suggest that that Hepu is one of the oldest seaports on China's ancient maritime trading route. Two wood samples were sent for 14C dating at CIRCE, Italy. The results of these measurements are presented and the related chronology is discussed. Considering the previous results from a pottery workshop and an excavated sea wharf, the interpretation of Hepu as one of the oldest seaports in ancient China and the important role it played is presented.


AMS measurement of 32Si at the China Institute of Atomic Energy (CIAE)

January 2013

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36 Reads

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5 Citations

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

A method for AMS measurement of 32Si has been established at CIAE with the HI-13 Tandem Accelerator and the newly developed ΔE-Q3D detection system. The production of 32Si, the preparation of a set of 32Si reference samples, and their subsequent analysis with the new system are described in detail. An overall suppression factor of more than 1012 for the interfering isobar 32S, resulting in a detection sensitivity below 32Si/Si = 5 × 10−15, has been demonstrated for a limited set of artificially produced samples.


AMS Measurement of 59Ni at China Institute of Atomic Energy

January 2013

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16 Reads

Radiocarbon

The long-lived radioisotope ⁵⁹ Ni is of interest in various research fields including neutron dosimetry, radioactive waste management, and astrophysics. In order to achieve the sensitivity required for such applications, the technique of accelerator mass spectrometry (AMS) ⁵⁹ Ni measurement has been developed at the AMS facility at China Institute of Atomic Energy (CIAE). Based on the AE-Q3D detection system in the CIAE AMS facility, the interference in ⁵⁹ Ni counting from the isobar ⁵⁹ Co has been reduced by a factor of 8 × 10 ⁶ . A series of laboratory reference samples and a blank sample were measured to check the performance of ⁵⁹ Ni measurement. A detection sensitivity of about 5 × 10 ⁻¹³ ( ⁵⁹ Ni/Ni) has been obtained.


AMS measurement of 59Ni at China institute of atomic energy

January 2013

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27 Reads

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1 Citation

Radiocarbon

The long-lived radioisotope 59Ni is of interest in various research fields including neutron dosimetry, radioactive waste management, and astrophysics. In order to achieve the sensitivity required for such applications, the technique of accelerator mass spectrometry (AMS) 59Ni measurement has been developed at the AMS facility at China Institute of Atomic Energy (CIAE). Based on the ΔE-Q3D detection system in the CIAE AMS facility, the interference in 59Ni counting from the isobar 59Co has been reduced by a factor of 8 x 106. A series of laboratory reference samples and a blank sample were measured to check the performance of 59Ni measurement. A detection sensitivity of about 5 x10-13 (59Ni/Ni) has been obtained. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona.


Radiocarbon dating of ancient canoes from Guangxi, China

January 2013

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11 Reads

Radiocarbon

Several canoes were excavated from coastal rivers in the Guangxi Zhuang Autonomous Region, southwest China. In order to confirm the age of the canoes, 6 samples were selected for radiocarbon dating from 3 canoes. The mean value of canoe NLJ was 365 ± 35 BP, and 2 samples from canoes MLJ and DFJ were 520 ± 21 and 499 ± 33 BP, respectively. The calendar ages cover a period from AD 1328 to 1641 at the 95% confidence level. These results disagree with previous studies that suggested canoes were only used over 1000 yr ago in China. We discuss the possible reasons for the results being younger than expected. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona.


Radiocarbon Dating of Ancient Canoes from Guangxi, China

January 2013

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17 Reads

Radiocarbon

Several canoes were excavated from coastal rivers in the Guangxi Zhuang Autonomous Region, southwest China. In order to confirm the age of the canoes, 6 samples were selected for radiocarbon dating from 3 canoes. The mean value of canoe NLJ was 365 ± 35 BP, and 2 samples from canoes MLJ and DFJ were 520 ± 21 and 499 ± 33 BP, respectively. The calendar ages cover a period from AD 1328 to 1641 at the 95% confidence level. These results disagree with previous studies that suggested canoes were only used over 1000 yr ago in China. We discuss the possible reasons for the results being younger than expected.


Citations (11)


... Accelerator mass spectrometry (AMS) is a detection technology with the advantages of less sample usage, short measurement time, and high sensitivity (Bennett et al. 1977;Nelson et al. 1977), making it relevant to various general cases. As the method with the highest sensitivity to measure 14 C, it is widely used in archaeology, geology, oceanography, biomedicine, and environment science (Nielsen 1952;Lubritto et al. 2004;Marzaioli et al. 2005;Salehpour et al. 2015;Shen et al. 2015Shen et al. , 2019Shen et al. , 2022aShen et al. , 2022bCheng et al. 2020). The high-precision and lowbackground 14 C measurements rely on the appropriate graphite preparation conditions and reliable graphite preparation system. ...

Reference:

EXPERIMENTAL CONDITIONS FOR 14 C GRAPHITE PREPARATION AT THE GXNU LAB, CHINA
Exposure age dating of Chinese tiankengs by 36Cl-AMS
  • Citing Article
  • November 2019

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

... The global fallout comes from atmospheric deposition and riverine inputs, while PPG material can be transported over long distances in the western Pacific and enter the South China Sea and ECS via the North Equatorial Current (NEC) and subsequent Kuroshio Current (Wu et al., 2018(Wu et al., , 2019Zhang et al., 2022;Wang et al., 2020;Wang et al., 2017;Zhang et al., 2020). Only a few investigations have been reported on plutonium isotopes in the Beibu Gulf in the northwest South China Sea (SCS) (Guan et al., 2018). While previous studies have primarily focused on the shoreline area, our study covers the entire sea area of the Beibu Gulf, allowing for a more comprehensive discussion of plutonium distribution and transport pathways in the Beibu Gulf. ...

Distribution and sources of plutonium along the coast of Guangxi, China
  • Citing Article
  • October 2018

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

... By determining the isotopic composition using mass spectrometric techniques such as inductively coupled plasma mass spectrometry (ICP-MS), the isotopically tagged substance can then be followed along its pathway from one compartment to another. These unique assets of the enriched stable isotope tracing method have resulted in its widespread application throughout different research fields, above all in ecological and biological [27][28][29][30], as well as clinical and medical studies [31][32][33][34]. ...

Study on 41Ca-AMS for diagnosis and assessment of cancer bone metastasis in rats
  • Citing Article
  • June 2015

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

... Th e earliest evidence of such structures date to about 4000-4500 years ago in the Levant and sites such as Wadi al-Jarf in the Egyptian Red Sea (Galili et al. 2019). Outside of the Mediterranean, some of the oldest harbors were in Lothal, India, which dates to about 4,300 BP (Before Present), and the Hepu Seaport in China, which dates to about 2,000 BP (Ruan et al. 2010). ...

AMS Radiocarbon Dating of an Ancient Pottery Workshop in Hepu County, China
  • Citing Article
  • Full-text available
  • August 2010

Radiocarbon

... The determination of radionuclides using plastic scintillation resin and conventional LSC instrument has being proposed and shown a promising application, especially for the rapid analysis, which can avoid the utilization of the organic scintillator, therefore reduce the organic radioactive waste [5][6][7][8]. In the past years, an increased application of LSC occurred in the measurement of radionuclides for decommissioning of nuclear facilities, such as 36 Cl, 41 Ca, 55 Fe, 63 Ni, 93 Zr, 99 Tc and 129 I [9][10][11][12][13][14][15][16]. The LSC has also shown a competitive application in the rapid analysis of radionuclides for emergency preparedness and homeland security purposes due to its relative short measurement time and simple target preparation [17][18][19][20]. ...

Measurement of 59Ni and 63Ni by accelerator mass spectrometry at CIAE
  • Citing Article
  • April 2015

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

... However, these reactions suffer from a relatively low 32 Si production yield, caused by the low natural abundance of 30 Si (=3.092%) and low cross-section values for 30 Si and 31 Si, respectively. Further, phosphorous was studied as a source for 32 Si, utilizing the reaction 31 P(n,γ) 32 P(n,p) 32 Si [20,21], as a production route. Proton-induced spallation reactions on heavier elements such as chlorine [22][23][24][25], iron [26], sulfur [27], and vanadium [13] have also been investigated, and the authors have reviewed the production of 32 Si. ...

AMS measurement of 32Si at the China Institute of Atomic Energy (CIAE)
  • Citing Article
  • January 2013

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

... Accelerator mass spectrometry (AMS), an innovative detection method based on accelerator and ion detection technology (Muller et al. 1977;Elmore et al. 1987), has the advantages of high sensitivity, small sample consumption, and short measurement time, so it has been widely used in nuclear physics, archaeology, earth science, environmental science, and life science (Shen et al. 2009(Shen et al. , 2012(Shen et al. , 2013(Shen et al. , 2015. In recent years, the design of AMS has tended to be compact, and construction and operation costs have been significantly reduced (Synal et al. 2007(Synal et al. , 2010(Synal et al. , 2013. ...

Study on calcium net absorptivity by 41Ca labeling calcium pool of rats
  • Citing Article
  • May 2009

Bone

... Detailed AMS conditions for 41 Ca measurements are described elsewhere [22]. Briefly, the 41 CaF 3 ions were selected by the injection system and injected into the accelerator. ...

41Ca analysis using CaF − in CIAE–AMS system
  • Citing Article
  • April 2010

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

... Finally these elemental times are added together to estimate the total time required to complete the job . The measurement of the product or service successful would be known through the time study and time standard by work sampling and workers complaint (Aft, 2001). It shows that time is the most important thing in determining company's performance and develop operational level of the company. ...

Improvement on AMS measurement method for 182Hf
  • Citing Article
  • April 2010

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

... Afterward, Wacker et al. [15] in the same laboratory further improved the experiment method and realized to analyze 99 Tc in only 0.25 L seawater samples, which detection limit is on the level of pg. In the same way, He et al. [16] measured 99 Tc at a terminal voltage of 8.25MV and a total energy of 90 MeV, of which the background sensitivity of 99 Tc was 1 × 10 8 atoms, and the selected stable isotope 99 Tc/ 93 Nb is about 10 -10 -10 -11 . Recently, Quinto et al. [17] also reported the work of 99 Tc measurement using AMS at a terminal voltage of 11.25 MV and the reached sensitivity was 3.6 × 10 6 atoms of 99 Tc, i.e. sub fg. ...

99Tc measurements with accelerator mass spectrometry at CIAE
  • Citing Article
  • June 2007

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms