Nguyen Dinh Chau

AGH University of Krakow | AGH

U and ²³⁴ U concentrations, ²³⁸ U/ ²³⁴ U ratios and Na, Ca, Mg, K, Al, As, Cd concentrations were measured in selected surface waters (streams, rivers and lakes), ground waters (dug wells) and underground waters (drill wells and thermal waters) in Quang Nam and Da Nang provinces, Central Vietnam. The mineralization was < 500 mg L ⁻¹ and Al, As, Cd...

This paper presents the radon concentrations of forty-eight samples collected from lakes, streams and rivers as surface water, from dug well as ground water and from boreholes and thermal waters as underground waters in the Da Nang – Quang Nam, central part of Vietnam. The measured radon concentrations varied from 0.265 (in lake water) to 107 Bq L􀀀...

Mục tiêu: Khảo sát đặc điểm hình ảnh di căn hạch trên 18F-FDG PET/CT và cắt lớp vi tính (CLVT) ở bệnh nhân ung thư thực quản 1/3 trên. Đối tượng và phương pháp: 92 bệnh nhân ung thư thực quản 1/3 trên được chụp CLVT và 18F-FDG PET/CT đánh giá giai đoạn trước điều trị. Đo đường kính trục ngắn hạch trên CLVT và SUVmax hạch trên 18F-FDG PET/CT. Kết qu...

Objective The aim of this study is to determine prognostic values of sequential 18F-FDG PET/CT metabolic parameters in locally advanced esophageal squamous cell carcinoma (ESCC) patients treated with definitive chemoradiotherapy. Materials and Methods Forty locally advanced ESCC patients treated with definitive chemoradiotherapy (dCRT) who received...

Activity concentration of Pb-210 in black powder and gamma radiation dose rate related to natural gas transportation were discussed. As part of the research, the content of radiolead (Pb-210) in black powder, spent filter containers, radon (Rn-222) activity concentration in natural gas and gamma radiation dose were measured around selected points o...

Purpose The aim of this study was to investigate whether standard uptake values (SUVs) of pretreatment 18F-FDG PET/CT were the surrogate parameters for predicting the outcomes in locally advanced esophageal squamous cell carcinoma patients treated with defnitive chemoradiotherapy. Materials and Methods Sixty patients with esophageal squamous cell c...

Mục tiêu: Đánh giá kết quả sớm của phương pháp xạ trị lập thể định vị thân so với tắc mạch hóa chất nhắc lại trong điều trị ung thư biểu mô tế bào gan còn tồn dư sau tắc mạch hóa chất. Đối tượng và phương pháp: Nghiên cứu can thiệp tiến cứu, có đối chứng trên 42 bệnh nhân ung thư biểu mô tế bào gan (UTBG) điều trị bằng xạ trị lập thể định vị thân (...

Mục tiêu: Đánh giá kết quả sống thêm lâu dài của phương pháp xạ trị lập thể định vị thân (SBRT) so với tắc mạch hóa chất nhắc lại trong điều trị ung thư biểu mô tế bào gan còn tồn dư sau tắc mạch hóa chất (TACE). Đối tượng và phương pháp: Nghiên cứu can thiệp tiến cứu, có đối chứng trên 42 bệnh nhân ung thư biểu mô tế bào gan điều trị bằng xạ trị l...

This work presents the chemical composition and concentration of radioactive and stable isotopes in water samples collected from nine well-known therapeutic centers located in north Vietnam. Excluding the Thanh Thuy – Phu Tho waters, which are hosted in Pleistocene sandstone with marble and gravel, the rest of studied waters are hosted in Paleozoic...

Determination of naturally radionuclides have been known well as an important topic in environmental study in recently. One of the most toxic radioisotope in nature, a daughter product of 238U decay chain is 210Po (polonium). The improvement and optimizations methods for determination of this attractive isotope are still presenting so far. In this...

Mục tiêu: Đánh giá kết quả bước đầu và độc tính của kỹ thuật xạ trị lập thể định vị thân trong điều trị ung thư biểu mô tế bào gan giai đoạn tiến triển có huyết khối tĩnh mạch cửa (HKTMC). Đối tượng và phương pháp nghiên cứu: Nghiên cứu tiến cứu, theo dõi dọc trên 31 bệnh nhân ung thư biểu mô tế bào gan có huyết khối thân hoặc nhánh chính tĩnh mạch...

In order to determine the optimal parameters when using an ultrasonic probe to measure cavern geometry when a metal borehole pipe is present, an investigation was firstly carried out on influence of a vertical metal plates with a thickness from 1 mm to 15 mm immersed in water on transmitted and reflected ultrasonic waves. The results obtained will...

We study the relations between several selected elements present in the Sin Quyen IOCG deposit, Lào Cai, North Vietnam, and interpret the obtained correlations, especially with a coefficient higher than 0.7. The correlations with high coefficients are mainly observed for the elements belonging to the chalcophile group (Cu, Ag, Au, Te, and Bi) and f...

The Sin Quyen iron oxide–copper-gold (IOCG) deposit is located in the southwestern part of the Sin Quyen Formation, close to the Red River shear zone. The deposit is controlled by the Sin Quyen fault, parallel to the Red River fault system in North Vietnam. U-Pb dating of zircon and uraninite and ³⁹Ar/⁴⁰Ar dating of biotite and K-feldspar in the Si...

A natural radioactivity in thermal water was investigated based on 19 selected thermal waters from Poland. The analysed results show that the radionuclides’ concentrations in the study waters vary over a wide range. The temperature of the waters varies from above 20 °C to above 80 °C. The waters are characterised by different mineralisation, chemic...

The research was focused on the level and distribution of 90 Sr in various parts of the terrestrial environment of Spitsbergen. The mean activity concentrations were noted lower in peats and soils than in cryoconite. Analysis of vertical variation of 90 Sr for soils and peats as well as isotopic ratios of 137 Cs/ 90 Sr and 239+240 Pu/ 90 Sr for cry...

The research was focused on the level and distribution of 90 Sr in various parts of the terrestrial environment of Spitsbergen. The mean activity concentrations were noted lower in peats and soils than in cryoconite. Analysis of vertical variation of 90 Sr for soils and peats as well as isotopic ratios of 137 Cs/ 90 Sr and 239+240 Pu/ 90 Sr for cry...

The measured gross alpha and gross beta activities in the edible muscle tissues of eleven selected marine species along the coast of North Vietnam varied from 10.2 ± 1.5 to 73.2 ± 8.1 Bq/kg (wwt) and from 10.6 ± 0.4 to 68.8 ± 2.8 Bq/kg (wwt), respectively. The lowest gross alpha activity was recorded for bigfin reef squid (Sepioteuthis lessoniana)...

Allanite minerals are the principal host of REEs in the Sin Quyen, Iron Oxide Copper Gold (IOCG) type deposit. The geochemical characteristics of these minerals are discussed in this work. The studied allanites have an unstable concentration of all major elements, such as REE (14-27 wt%), Ca (9-16 wt%), Al (8-19 wt%), Si (26-34 wt%) and Fe (12-21 w...

Liver transplant (LT) is the curative treatment for patients with hepatocellular carcinoma (HCC). Bridge therapies are local treatments given to patients on the LT waitlist, to prevent tumor progression and to reduce the dropout rate. Case presentation: We reported a 40-year-old man diagnosed with Barcenola-Clinic Liver Cancer BCLC intermediate sta...

The article describes three interlaboratory experiments concerning 222Rn determination in water samples. The fi rst two experiments were carried out with the use of artifi cial radon waters prepared by the Laboratory of Radiometric Expertise (LER), Institute of Nuclear Physics, Polish Academy of Sciences in Kraków in 2014 and 2018. The third experi...

Gridded aeromagnetic and aeroradiometric datasets of Isanlu sheet 225 were processed and interpreted in order to map the geological structures and characteristic lithology, as well as potential mineral ore zones in the area. Recorded aeromagnetic data were reduced to the magnetic equator before filtering operations which enhanced the magnetic anoma...

This paper presents an assessment of the potential usefulness of the Ground Conductivity Meter (GCM) method to locate seepage pathways in the Maniow levee zone near Kraków, Poland. We have realized this aim through geological recognition of the study area, which requires the implementation of GCM data inversion measured in the sounding version. The...

Mag ne tite, py rite, pyrrhotite, chal co py rite and sphalerite are the ma jor min er als iden ti fied in the de posit, while il men ite, marcasite, ten nan tite, cubanite, ar seno py rite, ga lena, al la nite, chevkinite, ap a tite, Bi-na tive, bis muthi nite, electrum, na tive gold, and tellurides are the mi nor ones in the Iron Ox ide Cop per G...

The Ruczaj district in Kraków is the potential building area of high flat blocks for inhabitants. This area is built of the gypsum basement covered by the soil and impermeable clay beds with several meters of thickness. The flat blocks must be set on the textured gypsum layer. In the result of the rainfall and static pressure of the blocks, the wat...

Effectiveness of transient electromagnetic method (TEM) used for the localization of Pb-Zn ore bodies at the Cho Don deposit, province Bac Can, North Vietnam is appraised based on the modeling processes results. Conductive Pb-Zn ore bodies hosted in high-resistive limestone are good conditions for the application of the TEM. The modeling process r...

Effectiveness of transient electromagnetic method (TEM) used for the localization of Pb–Zn ore bodies at the Cho Don deposit, province Bac Can, North Vietnam is appraised based on the modelling processes results. Conductive Pb–Zn ore bodies hosted in high-resistive limestone are in good conditions for the application of the TEM. The modelling proce...

The Ruczaj district in Kraków is the potential building area of high flat blocks for inhabitants. This area is built of the gypsum basement covered by the soil and impermeable clay beds with several meters of thickness. The flat blocks must be set on the textured gypsum layer. In the result of the rainfall and stat-ic pressure of the blocks the wat...

The 238U, 226Ra and 232Th contents of six samples from the Mandena black sand placer deposit were determined by gamma-ray spectrometry and varied from 2280 to 4600 Bq/kg, 1530 to 2900 Bq/kg and 11,600 to 25,400 Bq/kg, respectively. The activity concentration of 232Th is significantly higher than 238U and there is no equilibrium between 238U and 226...

Uranium and radium isotopes were measured in 17 water samples (6 thermal, 3 stream and 8 commercial bottled waters) using LSC and alpha spectrometer after chemical separation. The thermal and stream water samples were collected from Kim Boi spa Hoa Binh, North Vietnam. The measured radioactivity ranged ≤ 0.5 ÷ 9.0 mBq/L for ²³⁸U, 1.60 ÷ 18.6 mBq/L...

The paper presents a 3D model of ore bodies of the Sin Quyen iron oxide copper-gold deposit in Lao Cai province, North Vietnam. To build 3D model we used the computer software MineScape and archival geological, geophysical data recorded from 146 boreholes, 21 tunnels and 216 trenches, including the data obtained from chemical and neutron instrument...

Yen Phu rare earth deposit covering over 0.7 km2 in Yen Bai province, Northern Vietnam contains heavy elements bearing radioactive materials. The area has been studied based on data of several thousand meters of boreholes, 2000 m3 of trenches, shallow shafts, and thousands of rock samples. This article shows the results of radioactive measurements...

Mineral and therapeutic waters widely occurring in the Polish Carpathians contain a vast amount of biogenic elements. However, radioactive elements like radium isotopes are also found in these waters. This paper presents the first results of the activity concentration measurements of Ra-224 in selected mineral waters of the Polish Carpathians. Addi...

In the present study, the K-40, U-238, Ra-226, Pb-210, Ra-228 and Th-228 activity concentrations were measured in 64 samples of wastes generated from shale gas exploration in North-Eastern Poland. The measured samples consist of drill cuttings, solid phase of waste drilling muds, fracking fluids, return fracking fluids and waste proppants. The meas...

This work presents the physical properties, chemical composition, natural radionuclides’ concentrations and the relative values of δ ¹⁸O, δ ²H of selected bottled mineral, mineral and therapeutic waters of some water intakes localized at different therapeutic centers in Belarus. The water samples were collected in the period from January 2012 to Ju...

One of the important rare earth deposits is the Dong Pao localized in Lai Chau province, West-North of Vietnam. Generally, the deposit is composed of two parts, the lower and the upper. The lower part is composed of dolomite, limestone and intrusive rocks, while the upper part of the profile is represented by a weathered zone containing soil and fr...

Temporary variation of natural radionuclidesʼ concentrations in selected mineral therapeutic waters of the Polish Carpathians. Prz. Geol., 65: 1031-1034. A b s t r a c t. The paper presents, the chemical composition and the activity concentrations of natural radionuclides (-ses were carried out for water samples collected twice in 2008 and in 2016....

Dokonano oceny zagrożenia radiacyjnego wynikającego z prowadzonych prac poszukiwawczych gazu ziemnego ze źródeł niekonwencjonalnych, przeprowadzając analizę zawartości naturalnych pierwiastków promieniotwórczych (K-40, U-238, Ra-226, Pb-210, Ra-228 i Th-228) w próbkach fazy stałej zużytych płuczek wiertniczych, płynu szczelinującego, płynu zwrotneg...

The field radiometric and laboratory measurements were performed at the Sin Quyen copper deposit in North Vietnam. The field gamma-ray spectrometry indicated the concentration of uranium ranging from 5.5 to 87 ppm, thorium from 5.6 to 33.2 ppm, and potassium from 0.3 to 4.7%. The measured dose rates ranged from 115 to 582 nGy/h, the highest doses b...

The radiation exposure due to Rn-222 and its progeny inhalation for clients and employees of selected thermal water spas was assessed. The radon risk was calculated using the measured Rn-222 activity concentrations in the investigated thermal waters and radon transfer coefficient, defined as a fraction of radon released from the swimming pool water...

The influences of aquifer formations and water chemical composition on the occurrence and activity ratio of radium isotopes in groundwater are discussed. Based on the model of desorption/adsorption processes of natural radionuclides in the rock-water system, the concentrations of radium isotopes and their activity ratio in groundwater are evaluated...

The determination of radium isotopes in drinking water by liquid scintillation technique requires some reagents that are used for separating radium from water samples. One of the main reagents is BaCl2·H2O. This paper presents the study of this compound and shows that barium chloride reagent is naturally contaminated with Ra-226. The Ra-226 activit...

The Dong Pao rare earth deposit is situated in the North-West Vietnam, its area amounts to 120 square km. The deposit was discovered due to the geological and radioactive surveys in the period of fifty years of the last Century (1). The Triassic dolomite, limestone, marble and Quaternary sediments are prevailing. The formation trending NW-SE and st...

Forty six houses at three typical inhabitant villages that are located in the rare earth field in northwestern Vietnam were surveyed for radon and thoron concentrations. The measurements were conducted by exposing alpha track detectors CR-39 inside and outside of dwellings for 4 months. The results showed that houses adjacent to the rare earth ore...

Concentrations of radioactive and stable isotopes as well as chemical compositions were determined in 32 water samples collected in 20 Belarusian therapeutic centres. Most of the analysed samples represent boreholes of different depths; between 100 m and 1,300 m. The amount of Total Dissolved Solids (TDS) in the mineral and therapeutic waters inves...

This paper presents the assessment of radiation exposure due to inhalation of Rn-222 and its progeny for workers and clients of selected thermal water spas. The evaluation of the radon risk is based on the activity concentration of Rn-222 in the investigated thermal waters. For this purpose, a radon transfer coefficient which describes a fraction o...

This paper presents the study of natural radioactivity in Tanzania Portland cements and their raw materials. Samples collected as raw materials were pozzolan, sandstone, limestone, clay, gypsum and cement as finished products. The natural radioactivity due to the presence of radium 226Ra, thorium 232Th and potassium 40K were measured by means of ga...

Concentration of activity of Cs-137 and its spatial distribution in soils and lichen Hypogymnia physodes were determined in the Gorce Mts. (several hundred km2) in S Poland. The authors distinguished two areas of the Gorce Mts. on the basis of markedly different Cs-137 depositions, whose respective average values are 4.4 and 9.9 kBq/m2 as at 1st Ju...

The measured chemical composition, concentrations of the uranium and radium isotopes (U-238, U-234, Ra-228, Ra-226) of 17 bottles water purchased from markets in Minsk Belarus and two water samples collected directly from catchments in the area of Minsk are presented. The bottled waters originated from not only Belarus but also Czech Republic, Russ...

The accuracy of estimation of the self-attenuation correction C, with the Cutshall transmission method in Pb-210 measurements by gamma-spectrometry was assessed using the Monte Carlo method. The Cutshall method overestimates the correction for samples with linear attenuation coefficient at 46.5 key higher than that of the standard and underestimate...

Natural radioactivity has been measured in 22 different bottled waters from central and southern Poland. Although most of the investigated waters originate from the Outer Carpathian hits. (Flysch Carpathians), samples from the Kraków-Czestochowa Upland, Lublin Basin, Podlasie Depression, Silesian-Kraków Monocline, Szczecin-Lodz Basin and Sudety Mts...

The chemical compositions and activity concentrations of 238U, 234U, 226Ra, 228Ra and 222Rn were measured in the thermal waters occurring in the Podhale Trough. This region, part of the Polish Inner Carpathians, is the artesian basin situated between two groundwater recharging zones, the Tatras to the south and the Pieniny Klippen Belt to the north...

The paper summaries the data of activity concentrations of uranium, radium isotopes, mineralization and temperature of thermal waters. The data were gathered not only from our measurements of thermal waters occurring in the Polish Carpathians, but also from the attained published references in the world. The graphical relations between concentratio...

The issue of natural radioactivity in groundwater is reviewed, with emphasis on those radioisotopes which contribute in a significant way to the overall effective dose received by members of the public due to the intake of drinking water originating from groundwater systems. The term 'natural radioactivity' is used in this context to cover all radi...

Surface and ground waters associated with abandoned uranium mines in the Kowary region, south-west Poland, has been investigated for their natural radioactivity levels. Concentrations of 238U, 234U, 226Ra, 228Ra and 222Rn isotopes were analyzed in 15 water samples collected from the old mining galleries, from Jedlica river and its inflow streams, a...

This paper presents the newly measured concentrations of natural radionuclides (238U, 234U, 226Ra, 228Ra and 222Rn) in water samples collected from old mining galleries (adits), the Jedlica River and streams and from some water intakes (shallow supply wells) near the town of Kowary. The study area is a region of the occurrence of polimetallic and u...

Factors controlling concentration and activity ratios of radium isotopes in groundwaters are presented. The influence of lithology, hydrological conditions and chemical composition of groundwaters on radium content is discussed. Based on simple model of adsorption/desorption processes in the rock-water system, the numerical model of evolution of ra...

This study focuses on the distribution of selected trace metals, 137Cs and 210Pb, in floodplain deposits of the lowland Warta River (southern Poland) downstream of Częstochowa, a large city with an iron smelter. The depth profiles of trace metal (Zn, Pb, Cu, Ni, Cd and Mn), 210Pb and 137Cs contents in floodplain sediments were used to derive deposi...

Activities of 238U, 234U, 228Ra, 226Ra, and 224Ra as well as total α- and β-activities of 23 bottled spring, mineral and therapeutic waters produced and distributed in southern and central Poland are presented. The activities vary from a few tenth to a few mBq·L−1 for uranium and to several hundred mBq·L−1 for radium isotopes. The activities of 40K...

Spring, mineral, and therapeutic waters widely occurring in the Carpathians and the Carpathian Foredeep contain significant amounts of elements important in human diet, e.g. calcium, magnesium, iron. However, heavy and radioactive elements that may have negative impact on human health are also present in these waters. The concentration of uranium (...

The doses of gamma radiation, concentrations of radium isotopes in water and sediments, radon concentration and concentration of alpha potential energy of radon decay products in the copper ore mine and in the mining region in the vicinity of Lubin town in Poland are presented. These data served as a basis for the assessment of radiological hazard...

The paper presents the theory and methodology of radon concentration measurement in the air by PicoRad detector, which consists of a porous canister held securely near the top of a plastic vial. The porous canister contains a bed of a controlled mass of charcoal (1.3 g) and silica desiccant (0.9 g). To measure the radon concentration, the vial dete...

A form of waste associated with mining activities is related to the type of deposit being mined and to the procedure of exploitation and enrichment adopted. The wastes usually contain relatively large amounts of technologically enhanced naturally occurring radioactive materials (TENORM). The TENORM are often stored on the surface. Consequently, the...

Radon mass exhalation rate of soil samples was measured using an exhalation chamber of 10 dm(3) volume and a Lucas cell. The results show that mass of sample, grain size and water content influence the radon mass exhalation rate. For soil of (226)Ra activity concentration about 2500 Bq kg(-1) and samples within the range from 0.20 kg to 0.50 kg, th...

In this paper, a method for the determination of the relative and mass exhalation rates is presented. For the measurement of radon content in an emanation chamber, an α/β liquid scintillation counter was applied. The method was preliminarily tested on the following samples: (1) samples of uranium tailing piles in the Kowary region, (2) samples obta...

A method for the determination of 226Ra, 228Ra and 210Pb in water samples of mining regions by measuring the and intensities with the help of a liquid scintillation counter is presented. The high-energy part of the -particle spectrum emitted by 210Bi is used for the determination of 210Pb content in the samples. An attempt is also given to explain...

A method for the determination of 226Ra, 228Ra and 210Pb in water samples of mining regions by measuring the α and  intensities with the help of a liquid scintillation counter is presented. The high-energy part of the -particle spectrum emitted by 210Bi is used for the determination of 210Pb content in the samples. An attempt is also given to exp...

In this paper, a method of determination of uranium 238 and 234 in mining waters of Andrzej kaolin open pit in Zarów (Lower Silesia) is presented. The method is based on independent measurements of alpha and beta radiation intensities by means of a liquid scintillation spectrometer alpha/beta. The initial volume of water sample was 3 dm3, then it w...

This paper presents a method for the determination of radium isotopes in mineralised mine waters, based on the separation of alpha- and beta-intensities measured in the precipitate by a liquid scintillation spectrometer in two time intervals (1 day and 7 days) after radium precipitation. The count rates of -particles give not only the concentration...

The coal parameters, ash content and ash slagging index, may be strongly related to the chemical composition of mineral impurities in coal. Based on this assumption the authors have examined the feasibility of neutron activation techniques, both as a laboratory and a well logging method, by recording induced gamma-rays in the two energy intervals w...

This paper presents an application of the spectrometric γ-γ method, as a well logging technique which provides all the data required for the preliminary study of Polish coal deposits. The method, used in borehole logging for metaliferous minerals, has already been shown to be useful in the exploration for coal. A relatively high logging speed and t...

The authors have examined the possibilities of a spectrometric gamma-gamma logging method. The method uses the so-called spectrometric parameters calculated as ratios of the intensities of scattered gamma rays measured in two energy windows, the boundaries of each window being selected separately for different purposes: determination of ash in coal...