Wyniki wyszukiwania - BazTech

1

Rapid 90Sr quantification method based on the Bateman equation for routine laboratory work

Wiatr Karol, Rubel Barbara, Kardaś Małgorzata

Nukleonika

|

2022

|

Vol. 67, No. 4

67--72

EN

Artificially introduced into the environment 90Sr is highly radiotoxic, so its content levels in foodstuff and biota require constant monitoring for radiological protection. Most analytical procedures used for 90Sr determination are time-consuming, and therefore, a faster approach is needed. Employing the Bateman equation enables more effi cient exploitation of the secular equilibrium between 90Sr and its daughter radionuclide 90Y in the calculations. This article describes a method for computing the 90Sr activity concentration, while accounting for 90Y activity. The developed approach was tested and validated in terms of its applicability in everyday analysis.

2

Radon in drinking water in the Białystok region of Poland

Karpińska M., Kapała J., Mnich Z., Szpak A.

Nukleonika

|

2010

|

Vol. 55, No. 2

177-180

EN

Water is one of the indoor sources of 222Rn. As radon is soluble in water, it is carried indoor by water supply and there it is released. The presence of radon in groundwaters is caused by direct migration of 222Rn from rocks and soil to waters as well as by radium content in water. Radon inflow indoor is possible in the areas where drinking water shows high radon concentration. Radon concentration changes significantly from low in natural surface water to relatively high from water in drilled wells. It is estimated that out of 10,000 Bq·m–3 of radon contained in water supply we can obtain radon concentration increase by 1 Bq·m–3 indoor. The aim of the study was to measure radon in water supply in the Białystok region and also estimation of doses and investigation how the treatment influenced radon concentration in water. Water was collected from rural and municipal waterworks as well as from home wells. Measurements of radon concentration in particular stages of drawing and treatment of water in Białystok waterworks were also conducted. A liquid scintillation method was used in the study. The arithmetic mean of radon concentrations in the samples was equal to 5800 Bq·m–3, median – 4800 Bq·m–3, and geometric mean – 4600 Bq·m–3. The lowest values of radon concentration were observed in surface waters (from surface intake). Radon concentrations in waters from drilled wells, shallow home wells and surface intake were compared and statistically significant differences were obtained at p < 0.05. The results of radon concentrations in drinking water in the Białystok area revealed radon-poor waters (88%) and low-radon waters (12%).

3

Differentiation between fossil and biofuels by liquid scintillation beta spectrometry - direct method

Edler R., Kaihola L.

Nukleonika

|

2010

|

Vol. 55, No. 1

127-131

EN

Liquid scintillation spectrometry of 14C in gasoline/ethanol and diesel oil was carried out using QuantulusŽ and straight mixtures of fuel and an organic scintillation cocktail. A linear correlation was found between the concentration of carbon that originates from the bioethanol (biocarbon) and the fuel mixture’s 14C activity in the range 0–100% (m/m) bioethanol content. Because of these good linear correlations, quantitative determination of a fuel’s biocarbon content can be made by 14C analysis. The direct method is also applicable to analysis of the bio-based materials dissolvable in solvents, which can be mixed with scintillation cocktails.

4

Measurement of radon concentration in the air by PicoRad detectors

Chau N. D.

Nukleonika

|

2008

|

Vol. 53, suppl. 2

21--24

EN

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 detector is exposed in the radon laden air for a certain interval of time (24, 48 or 72 h or longer), then the liquid scintillation cocktail is added into the vial and measured by the help of a liquid scintillation counter. In this paper both radon adsorption by the charcoal detector, while it is being exposed in the radon laden air, and desorption of radon from the charcoal into the liquid scintillation cocktail were investigated. As a result, some conclusions concerning the methodology of radon measurement by PicoRad detectors have been done. The desorption factor of radon from the charcoal into the liquid scintillation cocktail was determined. The radon concentration values in the air measured by PicoRad detectors were in good agreement with those obtained by an AlphaGuard radon monitor.

5

Determination of a supported radon activity concentration in bottled mineral waters

Komosa A., Madej E., Piekarz M.

Chemia Analityczna

|

2008

|

Vol. 53, No. 6

835-843

EN

Results of determination of supported radon concentration in bottled mineral waters purchased at markets in Lublin city were presented. Procedure of determination consists in radon extraction from water using the scintillation cocktail (Permablend III in toluene) followed by measurement with the ultra low-level spectrometer Quantulus with the alpha/ beta separation option. It was found that activity concentration of supported radon in water samples ranged from 8.70 to 388 mBq dm3. Annual effective dose calculated for maximum Rn activity value determined and total annual water consumption was equal only to about 0.2% of effective annual dose causing by atmospheric gaseous radon.

PL

W pracy przedstawiono wyniki oznaczeń stężenia radonu (będącego w równowadze z 226Ra) w butelkowanych, niegazowanych wodach mineralnych pochodzących z sieci handlowych Lublina. Procedura oznaczania polegała na bezpośredniej ekstrakcji radonu z wody przyużyciu koktajlu scyntylacyjnego (roztwór toluenowy scyntylatoraPermablend III, Packard) i pomiarze aktywności fazy organicznej przy użyciu ultra niskotlowego spektrometru Quantulus. Stwierdzono, że aktywności właściwe radonu zawierają się w granicach 8,70-388 mBq dm5. Roczna skuteczna dawka, obliczona dla maksymalnego stężenia radonu i całkowitego rocznego spożycia wody, stanowi jedynie 0,2% dawki otrzymywanej od gazowego radonu.

6

A protocol for determination of natural radionuclides in the geothermal water

Bem H., Olszewski M., Kaczmarek A.

Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa

|

2004

|

nr 1

94-95

7

Radon levels in household waters in southern Poland

Kusyk M., Mamont-Ciesla K.

Nukleonika

|

2002

|

Vol. 47, nr 2

65-68

EN

Determination of radon concentrations in household waters were performed in 1997 in three regions of south-western Poland which are considered to have an enhanced natural radioactivity level: in the Jelenia Gora and Walbrzych regions (both in south-western Sudety Mountains) and in the Upper Silesian Coal Basin. Water samples were collected from taps, wells and springs and were analyzed in a liquid scintillation counter. In the Upper Silesian Coal Basin all values are below 50 Bq/dm3 with a maximum of 32 Bq/dm3 and in the Sudety Mts. the radon concentration in water exceed this level in 68% of houses, reaching a maximum value of ca. 1400 Bq/dm3 in drilled well water in the Jelenia Gora region. The annual ingestion dose calculated for this value equals to ca. 0.5 mSv for infants, 0.4 mSv for children and 0.3 mSv for adults. The average annual effective whole body doses calculated for tap water samples for a representative population in the investigated regions range from about 0.02 mSv to 0.32 mSv and the maximum value reaches 1.39 mSv. The inhalation doses corresponding to the unit of water-borne radon concentration are about one order higher than the ingestion ones for tap water supplies.