Analysis of NBS Coal Standard Reference Materials 1632a and 1635 by Instrumental Neutron Activation Analysis

NBS SRM 1635 and NBS SRM 1632a were analyzed for trace and minor element contents by instrumental neutron activation analysis. The results of these analyses show excellent agreement with NBS certified values and/or literature values.     

Instrumental Neutron Activation Analysis of Nine New Reference Materials from the Geological Survey of Japan

Nine reference materials, recently distributed by the Geological Survey of Japan (JA-1, JB-la, JB-2, JB-3, JG-la, JGb-1, JP-1, JR-1 and JR-2) have been analysed by instrumental neutron activation analysis using well proven experimental techniques. Results for the twenty elements determined (selected rare earth elements, Fe, Ba, Co, Cr, Cs, Hf, Rb, Sc, Ta, Th and U) are assessed for accuracy and precision and show good agreement with previously published data.     

Instrumental Neutron Activation Analysis Of French Geochemical Reference Samples

Instrumental neutron activation analytical data, for eighteen trace elements (Ba, Co, Cr, Cs, Hf, Rb), Sb, Sc, Ta, Th, La, Ce, Nd, Sm, Eu, Tb, Yb, Lu), Hd₂O and Fe₂0₃ in eleven French geoche-mical reference samples are presented and discussed briefly.     

Instrumental Neutron Activation Analysis Of 37 Geochemical Reference Samples

37 geochemical reference samples, issued mostly by the U.S. Geological Survey and the "Centre de Recherches Pétrographiques et Géochi-miques", have been analysed for more than twenty trace elements using instrumental neutron activation technique. The results are compared with published data; in most oases, the agreement is good.     

Instrumental Neutron Activation Analysis of Twenty-Nine International Geochemical Reference Samples

Results of measurements of twenty-seven elements, most of them in trace amounts, by Instrumental Neutron Activation Analysis (INAA) in twenty-nine international geochemical reference samples from Canada, U.S.A., Japan, France and South Africa, are reported and compared with available literature values. In general, our data agree well with literature values. The disagreement of our results (e.g., Zr in Canadian syenites and several trace elements in USGS ultrabasic rocks) with those reported by other workers is briefly discussed and ways of improving INAA are pointed out. The present report includes data on several trace elements for which existing data are rather scarce.     

Determination of Trace Elements in Selected Geological Reference Materials by Instrumental Neutron Activation Analysis

Data are presented for eight rare earth elements and ten other elements in 22 reference samples recently distributed by the University of Liege (Belgian sedimentary rock reference samples), the Geological and Mining Service (Suriname), the Geological Survey of Japan and the Venezuelan laterite. Determinations were made using a well characterised, high precision, neutron activation analysis technique.     

Instrumental Neutron Activation Analysis of NBS 1633a Fly Ash and 1632a Bituminous Coal Reference Samples With the Use of Short Irradiation

Instrumental neutron activation analysis has been applied to the analysis of recently issued NBS reference materials SRM 1633a Fly Ash and SRM 1632a Bituminous Coal. Only the nuclides with half-lives of less than 48 hours have been used. The results for the determination of 18 elements (Fly Ash) and 19 elements (Coal) are compared with the values given by NBS and with recent results obtained by other investigators.     

Instrumental Neutron Activation Analysis of Two French Geochemical Reference Samples - Basalt BR and Biotite Mica-Fe

Instrumental neutron activation analysis results for 20 trace elements (Sc, Cr, Co, Ni, Rb, Cs, Ba, La, Ce, Nd, Sm, Eu, Gd, Tb, Tm, Yb, Lu, Hf, Ta, Th) and for two major elements (Na and Fe) in two geochemical reference samples issued by the "Centre de Recherches Pétrographiques et Géochimiques" are reported and compared with available literature values. In general our results agree well with recommended or proposed values.     

Instrumental Neutron Activation Analysis by Collecting Only One Spectrum: Results For International Geochemical Reference Samples

Instrumental neutron activation analysis of rocks and minerals is currently done on basis of collecting 2 or 3 energy spectra. We have found that, by collecting one spectrum one week after irradiation, satisfactory results for the USGS and CRPG geochemical reference samples can be obtained.     

Multielemental Neutron Activation Analysis of Chinese Geochemical Reference Samples

The concentrations of 36 elements in geochemical reference samples issued by the Ministry of Geology and Mineral Resources of China were determined by neutron activation analysis. Three main variants of the technique, instrumental, epithermal, and nreirradiation separation neutron activation analysis (INAA, ENAA, PNAA), were employed in a systematic study of the samples by three laboratories: the Institute of Atomic Energy of the Academia Sinica (INAA, ENAA), the Institute of High Energy Physics of the Academia Sinica (INAA), and the Institute of Geophysical and Geochemical Prosnecting of the Ministry of Geology and Mineral resources (INAA,PNAA). Both long and short irradiations and both Ge(Li) and HPGe detectors were used. A supplementary software nackage for data processing was developed. About 81% of the data determined by neutron activation agreed with recomended values with in 15%.     

Instrumental Thermal Neutron Activation Determination of 20 Elements in Nineteen Silicate Reference Materials

Elemental concentrations of Al, Ba, Ca, Ce, Co, Cr, Cs, Dy, Eu, Fe, Hf, Mn, Na, Rb, Sb, Sc, Ta, Th, Ti and V have been measured in 11 USGS, 6 CCRMP and 2 NBS reference materials by instrumental thermal neutron activation analysis. The results are compared with recent consensus and agency values.     

Neutron Activation Analysis of Nine GSJ Sedimentary Rock Reference Samples

Nine rock reference samples "Sedimentary rock series" issued by the Geological Survey of Japan (GSJ) were analysed for up to 31 elements by neutron activation analysis (NAA); 14MeV-NAA for Si and Al, fission track method for U, radiochemical and instrumental NAA for rare-earth elements, and instrumental NAA for the remaining elements, with reactor neutrons for the latter three. The present results are compared with reported values.     

中子活化分析大洋多金属结核标准物质的研究

采用中子活化分析相对＿Ｋ０法对研制的两个深海多金属结核标准物质ＧＳＰＮ＿２和ＧＳＰＮ＿３中的２６种主量和微量元素进行了定值测定,所得结果与初定值符合;对中子辐照自屏蔽效应进行了实验测定和理论计算,结果显示了很好的一致性;同时还对这两个多金属结核标准物中的Ａｓ、Ｂａ、Ｃｅ、Ｃｏ、Ｅｕ、Ｆｅ、Ｌａ、Ｌｕ、Ｍｎ、Ｍｏ、Ｎａ、Ｓｂ、Ｓｍ、Ｓｃ、Ｔｈ、Ｙｂ和Ｚｎ的取样量与取样误差关系进行了研究。结果表明,在ＧＳＰＮ＿２和ＧＳＰＮ＿３试样中分别有８种和１１种元素,在取样量１０ｍｇ时其取样误差小于１％。     

Neutron Activation Analysis of Seven B.C.S. Certified Reference Materials of Geological Interest

The concentrations of 26 elements have been investigated in seven BCS certified reference samples using three varieties of neutron activation analysis. The ANRT granite GS-N was used as the comparator reference material while the USGS basalt BHVO-1 and the GIT-IWG basalt BE-N were analysed concurrently to assess the analytical accuracy.     

Determination of Chlorine Contents in Geological Survey of Japan Reference Materials by Prompt Gamma Neutron Activation Analysis

We determined chlorine contents in nine GSJ (Geological Survey of Japan) reference materials (JB-1, 1a, 2, 3; JA-1, 2, 3; JR-1, 2) by prompt gamma neutron activation analysis, employing the standard addition method. Pressed powder disks of each reference material were used for neutron irradiation and gammaray measurement, after known quantities (25-200 μl) of sodium chloride solution were added. The influence of the nearby sodium peak overlap was checked, and fluctuations in the chlorine count rate were corrected using silicon as an internal standard. The slopes of calibration lines for seven reference materials (JB-1, 2, 3; JA-1, 2, 3; JR-2) and SiO₂ powders fall within 5% error, and their chlorine values were obtained from the intercepts. Chlorine contents in JB-1 a and JR-1 were also determined by using the calibration lines. Our chlorine values ranged from 26.1 to 934 μg g-¹, which agrees well with the previously reported values.     

地质样品中超痕量铂族元素的中子活化分析

文章概述了中子活化分析的基本原理和地质样品中超痕量铂族元素的中子活化分析方法。其中除介绍了样品的制备方法、照射和测量条件之外，还对地质样品中铂族元素放射化学分离方法进行了说细的讨论和评述。引用文献２４篇。     

Determination of Selenium in Twenty Geological Reference Materials by Neutron Activation And Inorganic Ion Exchange

Twenty geological reference samples have been analyzed for selenium using thermal neutron activation followed by radiochemical separation of ⁷⁵Se. Data are presented for 3 NBS, 11 USGS, and 6 CCRMP materials.     

Instrumental Neutron Activation Analysis of Estuarine Sediment as a Proposed Reference Material for Environmental Studies

The International Atomic Energy Agency (IAEA) Marine Environmental Studies Laboratory (MEL) organised an intercomparison exercise, through its Analytical Quality Control Services (AQCS), for the determination of trace elements in estuarine sediment IAEA-405, well suited for the characterisation of sediments. The instrumental neutron activation analysis technique (INAA) was developed using a 27 kW low power research reactor. Forty elements in the sediment were determined with a measurement precision varying from 1.8% to 12.3%. IAEA reference materials SL-1 and SD-M-2/TM were analysed throughout this work as quality assurance samples.     

Determination of Ti, K, Sm and Gd Values in Geological Survey of Japan Reference Materials by Prompt Gamma Neutron Activation Analysis

Prompt gamma neutron activation analysis was applied to the determination of the titanium, potassium, samarium and gadolinium contents of nine Geological Survey of Japan (GSJ) reference materials (JB-1, 1a, 2, 3; JA-1, 2, 3; JR-1, 2). Firstly, the values in JB-1 were determined by the standard addition method: pressed powder disks of JB-1 were used for neutron irradiation and gamma-ray measurements, after known quantities of standard reagents had been added. Secondly, the contents of eight other reference materials were determined by comparison methods using JB-1 as the comparative standard. The precision of analyses were obtained by replicate determinations on these samples. The relative standard deviation was generally less than 5%. For most samples, analysed values agreed well (< 5%) with the recommended values.     

Accurate Determination of Chlorine,Bromine and Iodine in U.S. Geological Survey Geochemical Reference Materials by Radiochemical Neutron Activation Analysis

Trace amounts of three halogens (chlorine, bromine and iodine) in seventeen U.S. Geological Survey (USGS) geochemical reference materials were determined by radiochemical neutron activation analysis (RNAA). The materials analysed were AGV‐2 (andesite), BCR‐2, BHVO‐2 and BIR‐1a (basalts), CLB‐1 (coal), COQ‐1 (carbonatite), DGPM‐1 (disseminated gold ore), DNC‐1a (dolerite), DTS‐2b (dunite), GSP‐2 (granodiorite), Nod‐A‐1 and Nod‐P‐1 (manganese nodules), QLO‐1a (quartz latite), SBC‐1 (marine shale), SDC‐1 (mica schist), SGR‐1b (shale rock) and W‐2a (diabase). The chlorine, bromine and iodine contents were determined to be 5.64 mg kg^?1 (BIR‐1a) to 4410 mg kg^?1 (Nod‐A‐1), 0.039 mg kg^?1 (BIR‐1a) to 52.1 mg kg^?1 (CLB‐1), and 0.041 mg kg^?1 (BIR‐1a) to 599 mg kg^?1 (CLB‐1), respectively. The RNAA data of the three halogens were compared with the corresponding data in the literature.