Quality evaluation of the k 0-standardized neutron activation analysis at the Dalat research reactor

Ho, Manh-Dung; Tran, Quang-Thien; Ho, Van-Doanh; Cao, Dong-Vu; Nguyen, Thi-Sy

doi:10.1007/s10967-016-4795-4

Cited by 21 publications

(5 citation statements)

References 13 publications

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“…The Zscore is -0.33 (<2), indicating that the measurement results are acceptable. The U-test score is 1.44 (<1.64), indicating that the measurement results do not differ significantly from the assigned value [23][24][25].…”

Section: Resultsmentioning

confidence: 89%

Quantification of Aluminum Contents in Cooked Foodstuffs From Three Regions in Java Using Neutron Activation Analysis

2020

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Aluminum is widely available in nature and the third most abundant element on earth. Improper intake of aluminum can increase toxicity and correlate with Alzheimer's disease. One source of aluminum comes from food. In this study, aluminum content in foodstuffs was analyzed using neutron activation analysis. Various foodstuffs were purchased from markets in three regions in Java, namely Bangkalan (East Java), Magelang (Central Java), and Cianjur (West Java) and cooked at a temperature above 80°C until the ready-to-eat condition. The cooked samples were freeze-dried and irradiated in the G.A. Siwabessy research reactor with neutron flux of 5x1013 neutrons.m2.s-1. Post-irradiation samples were analyzed using gamma spectrometry. The results show that the aluminum contents in each foodstuff from one region have a strong correlation with other regions (Pearson correlation coefficient r>0.9, P<0.001), indicating that the distribution of aluminum content does not differ from one region to another. The staple food category has a relatively low aluminum content with an average value of 24 mg/kg and a maximum value of 35 mg/kg. The dish category has higher aluminum content with an average value of 51 mg/kg and a maximum value of 77 mg/kg. The vegetable category has the highest content with an average value of 156 mg/kg and a maximum value of 710 mg/kg owned by caisim. Caisim is interesting for further research because of its ability to store large amounts of several elements. In general, the intake of aluminum sourced from these foods is still below the allowed value.Keywords: Neutron activation analysis, Food safety and security, Alzheimer, Aluminum distribution, Pearson correlation

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Section: Resultsmentioning

confidence: 89%

Quantification of Aluminum Contents in Cooked Foodstuffs From Three Regions in Java Using Neutron Activation Analysis

2020

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“…In case of INAA, the SMELS III sample was sealed in a polyethylene bag and irradiated for 09 hours at the Rotary Rack channel of Dalat research reactor. The ratio f between thermal and epithermal neutron flux is 37.3 and epithermal neutron spectrum factor α is 0.073 [7]. The measurement was carried out for about ~18 hours after ~5 days of decay.…”

Section: B Results and Discussionmentioning

confidence: 99%

Determination of in situ detection efficiency for IM-NAA of non-standard geometrical samples

Nguyen¹,

Trinh²,

Tran³

et al. 2021

Nucl. Sci. and Tech.

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The k0-based internal mono-standard (IM) method was first proposed for the concentration analysis of samples of non-standard geometry in the 2000s. The method has demonstrated several advantages such as the elimination of gamma-ray self-attenuation and geometrical effects. On the other hand, the accuracy of the method principally depends on the in situ relative detection efficiency, which requires to be obtained in each measurement. Therefore, the relative detection efficiency is always under consideration for the improvement of the analysis results. The present paper describes a simple and automatic procedure for the determination of the relative efficiency using one or more activation products emitting gamma rays over a considered range of the spectrum. The procedure can be applied for INAA and PGNAA analysis.

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“…Similar to our previous study 21 , the neutron irradiations were performed for 10 hours on Rotary Rack at a thermal neutron ux of approximately 3.59´10 12 n.cm -2 .s -1 of Dalat Nuclear Research Reactor, Vietnam. At this position, the deviation of the epithermal neutron spectrum and the ratio of thermal/epithermal neutron uxes were a = 0.073 ± 0.001, and f = 37.3 ± 0.4, respectively 52 . The nuclear reactions of interest in this study were 75 As(n, g) 76 As (T = 26.32 h, E g = 559.1 keV), 81 Br(n, g) 82 Br (T = 35.30 h, E g = 776.5 keV), 59 Co(n, g) 60 Co (T = 5.27 y, E g = 1332.5 keV), 50 Cr(n, g) 51 After 12 days of decay, the sample was measured for two hours on HPGe gamma spectroscopy (Canberra, USA) with an energy resolution of 2.0 keV at the 1332.2 keV peak of 60 Co.…”

Section: Irradiation Measurements and Calculationmentioning

confidence: 89%

Analysis of trace element levels in the nails in patients with colorectal cancer: Consider to the effects of chemotherapy or radiotherapy

Phương¹,

Binh²,

Linh³

et al. 2020

Preprint

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Nails are considered as suitable biological materials for the diagnosis of diseases by measuring trace element levels. This study aimed to evaluate the role of trace elements in detecting the risk of colorectal cancer. Evaluating the effects of cancer treatment with chemotherapy or radiotherapy was also the aim of this study. The levels of trace elements in the nails of 104 patients with colorectal cancer and 112 healthy subjects were analyzed using the k0-standardization method of neutron activation analysis. The results showed that there were significant differences of the following elements, As, Fe, Hg, Sc, Se, and Zn between the control and the patient groups, while it was not the case for the elements Br, Co, and Cr. Furthermore, this study showed that there was no significant difference in the levels of the obtained trace elements in both colon and rectal cancer patient groups between untreated and treated subjects. We conclude that the levels of As, Hg, Fe, Se, and Zn in integrated samples of the fingernail and toenails may be used to evaluate the colorectal cancer risk, and they were not affected by chemotherapy or radiotherapy.

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Quality evaluation of the k 0-standardized neutron activation analysis at the Dalat research reactor

Cited by 21 publications

References 13 publications

Quantification of Aluminum Contents in Cooked Foodstuffs From Three Regions in Java Using Neutron Activation Analysis

Quantification of Aluminum Contents in Cooked Foodstuffs From Three Regions in Java Using Neutron Activation Analysis

Determination of in situ detection efficiency for IM-NAA of non-standard geometrical samples

Analysis of trace element levels in the nails in patients with colorectal cancer: Consider to the effects of chemotherapy or radiotherapy

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