scholarly journals INVESTIGATION OF EQUIVALENT DOSE RATE VARIATION IN THE GROUND‐LEVEL AIR BY LITHUANIAN HIGHWAYS

2006 ◽  
Vol 14 (1) ◽  
pp. 3-9
Author(s):  
Donatas Butkus ◽  
Kristina Živilė Gaponovienė
Keyword(s):  
Gamma Radiation ◽  
Dose Rate ◽  
Absorbed Dose ◽  
Ground Level ◽  
Weighting Factor ◽  
Equivalent Dose ◽  
Rate Variation ◽  
Soil Composition ◽  
Equivalent Dose Rate ◽  
Ground Level Air

This investigation deals with equivalent dose rate (EDR) of the ground‐level air caused by gamma radiation. Weighting factor for gamma radiation is equal to one, therefore, EDR of the ground‐level air should be similar to the absorbed dose from the ionic radiation dose. In this paper the main parameters which determine the level of equivalent dose rate in the ground‐level air by the Lithuanian highways are defined and analysed. EDR in the ground‐level air by Lithuanian highways was measured and compared to similar average regional values with reference to modeling results evaluating value variation reasons. In the investigation of EDR the ground‐level air was measured in winter and summer. Samples of soil and asphalt were examined with a gamma spectrometer. It was determined that dependence of EDR values in the ground‐level air correlated and depended upon the soil composition, floral or snow cover and distance from an asphalt cover. Cosmic radiation impact on EDR formation is equal at all the locations. Gamma radiation of natural‐origin radionuclides in the soil have the greatest influence on EDR formation in the ground‐level air. The modeling program VISIPLAN was used to define impact of radionuclide radiation from an asphalt cover on EDR formation in a roadside zone. The modeling program InterRAS was used to define EDR formation in the ground‐level air due to gamma radiation of the soil radionuclides.

scholarly journals High Terrestrial Radiation Level in an Active Tin-Mine at Jos South, Nigeria

2020 ◽  
Vol 24 (3) ◽  
pp. 435-442 ◽  
Author(s):  
M. Atipo ◽  
O. Olarinoye ◽  
B. Awojoyogbe ◽  
M. Kolo
Keyword(s):  
Gamma Radiation ◽  
Dose Rate ◽  
Technological Development ◽  
Absorbed Dose ◽  
Ground Level ◽  
Absorbed Dose Rate ◽  
Lifetime Cancer Risk ◽  
Radiation Level ◽  
Background Gamma Radiation ◽  
The Mean

Mineral mining and milling can be a source of national economic and technological development. However, mining of minerals has been confirmed to disturb the natural distribution of radioisotopes in the soil, air and water bodies in the biota. In an attempt to evaluate the radiological burden resulting from tin mining activities at Rayfield-Du area of Jos, the background gamma-radiation level in the mine was measured via a well calibratedhand-held dosimeter placed at 1 m above ground level. The mean absorbed dose rate, annual effective dose rate and excess lifetime cancer risk for the mine was 0.83 μSvh-1; 1.44 mSv-1 and 0.005 respectively. Generally, dose rates were higher in the mine pits and processing areas as compared to administrative areas of the mine. The mean measured dose rate and calculated dose parameters for the mine were all high when compared to the regulatory limit for public exposure. The potential of developing radiation-induced health defects as a result of high radiation absorbed dose rate by the miners and dwellers around the mine is highly probable.  Keywords: Gamma-radiation; mine; absorbed dose rate; radiation exposure.

scholarly journals CHANGES OF NATURAL IONIZING RADIATION IN ANTHROPOGENIC OBJECTS

2005 ◽  
Vol 13 (3) ◽  
pp. 103-107
Author(s):  
Viktorija Bogdevičiene ◽  
Milda Pečiuliene ◽  
Aloyzas Girgždys
Keyword(s):  
Ionizing Radiation ◽  
Dose Rate ◽  
Specific Activity ◽  
Anthropogenic Activities ◽  
Ventilation System ◽  
Ground Level ◽  
Equivalent Dose ◽  
Field Soil ◽  
Equivalent Dose Rate ◽  
Arable Field

Dosimetric investigations that were performed in various geographic places, mostly connected to anthropogenic activities, are observed in this work. Equivalent dose rate was measured with a radiometer SRP‐68, 0,3 m above the point of investigation. It is determined that equivalent dose rate changes from 97 nSv/h measured above a non‐arable field soil to 219 nSv/h measured in a tunnel. The hignest values of equivalent dose rate are in closed buildings with a bad ventilation system. It is noticed that the specific activity of 40K and 226Ra changes depending on the depth of a trench. The specific activity of 40K is the highest at the deepest point (441 Bq/kg) of a trench; the highest specific activity of 226Ra is at the ground level (37 Bq/kg).

scholarly journals Analysis of Indoor Radon Level and its Health Risks Parameters in Three Selected Towns in Port Harcourt, Rivers State, Nigeria

2021 ◽  
Author(s):  
Orlunta Aloysius Ndubisi ◽  
Margaret Apaem Briggs-Kamara ◽  
Friday Barikpe Sigalo ◽  
Tamunobereton-Ari Iyeneomie
Keyword(s):  
Cancer Risk ◽  
Dose Rate ◽  
Concentration Level ◽  
Indoor Radon ◽  
Absorbed Dose ◽  
Life Time ◽  
Mean Value ◽  
Equivalent Dose ◽  
Equivalent Dose Rate ◽  
Indoor Concentration

Analysis of indoor radon level and its health risk parameters has been carried out in Borikiri (BT), Diobu (DR), and Rebisi (RB) towns in Port Harcourt, Rivers State, Nigeria. A pocket sized Corentium Arthings digital radon detector meter was used to record the indoor radon concentration levels. The geographical coordinates were recorded using a hand-held geographical positioning system (GPS) for the various sample points. A total of ten houses were measured for each town making a total of 30 sample points for the three communities. The results obtained show that for Borikiri town, the concentration level varied from 30.7100 - 19.9800 Bqm-3 with an average of 11.32 ± 2.59 Bqm-3 . The annual absorbed dose varied from 7.7478 - 1.1202 mSv/yr with a mean value of 2.59 ± 0.65 mSv/yr while the annual equivalent dose rate varied from 0.829 - 0.336 mSv/yr with an average of 0.69 ± 0.16 mSv/yr The excess life time cancer risk calculated for seventy years (70yrs) varied from 6.510 - 0.941 with an average of 2.45 ± 1.71. The results of the indoor concentration level for Diobu town ranged from 37.74 - 5.9200 Bqm ?3 with a mean value of 12.95 ± 2.91 Bqm-3 . The annual absorbed dose for the area ranged from 9.5214 - 1.1494 with an average of 3.26 ± 0.73 mSv/yr, the annual equivalent dose rate varied from 0.694-0.359 with a mean of 0.78±0.8, the excess life time cancer risk calculated for seventy years ranged from 8.000-1.725 with a mean of 2.91±0.61. The indoor concentration level for Rebisi town ranged from 12.9500?4.0700 Bqm-3 with an average of 8.55 ± 1.00, the annual absorbed dose ranged from 3.2671 - 1.0268 mSv/yr, the annual equivalent dose rate varied from 0.784 - 0.269 with an average of 0.52 ± 0.06, the excess life time cancer risk of 2.745 - 0.863 with an average of 1.82 ± 0.21. The results of the indoor concentration levels, the annual absorbed dose and the annual effective dose rate are all below the ICRP safe limit. However, the results of the excess life time cancer risk are all higher than the ICRP safe standard limit of 0.029 × 10-3 .

scholarly journals Estimation of the equivalent dose rate of gamma radiation in the open territory of the city of Voronezh

2020 ◽  
Vol 12 (4) ◽  
pp. 66-71
Author(s):  
Mikhail I. Chubirko ◽  
Oleg V. Klepikov ◽  
Semen A. Kurolap ◽  
Maksim K. Kuzmichev ◽  
Ekaterina M. Studenikina
Keyword(s):  
Inner City ◽  
Gamma Radiation ◽  
Dose Rate ◽  
Equivalent Dose ◽  
Open Area ◽  
Coating Materials ◽  
Equivalent Dose Rate ◽  
Gamma Background ◽  
Recreational Area ◽  
The City

The aim of the study was to identify patterns of distribution of the magnitude of the the equivalent dose rate of gamma radiation in an open area of urban space, depending on the functional purpose of the inner-city territory and the type of artificial coating. Materials and methods. Measurements of the equivalent dose rate of gamma radiation (gamma background) in the city of Voronezh were carried out at 70 points, conventionally classified by functional use (industrial area, transport area, residential area, recreational area), as well as the type of coverage in open areas (granite stone blocks , asphalt pavement, paving slabs, open ground) For carrying out radiation monitoring, a highly sensitive portable search device was used – a search measuring gauge microprocessor ICP-PM1401MA. To assess the reliability of differences in the average values of the indicator by functional inner-city zones and types of artificial turf, the methods of parametric statistics (Student’s criterion) are used. Parametric methods of statistics in comparison with nonparametric methods allow statistically unambiguous interpretation of the results. There is no need to use other statistical tools in this regard. Results. The results of the evaluation of the radiation background show that the equivalent dose rate of gamma radiation (gamma background) in the city of Voronezh is from 0.06 to 0.14 µSv / h and it does not exceed the permissible value (0.3 µSv / h). Significant differences in the average values of indicators in the industrial, transport, residential functional areas in relation to the recreational area were not found (tcalc. < ttabl., P < 0.05). The maximum levels of gamma background (0.09-0.14 µSv / h) in the territory of the city of Voronezh were found in those places where processed natural stones (granite) were used for the improvement of the territory. When solving the problem of identifying the dependence of the indicator of the equivalent dose rate of gamma radiation in an open area of an inner-city space on the type of coating, in order to reduce uncertainties in the future, it is necessary to take into account the formulation of materials, especially the fraction of granite chips.

scholarly journals Measuring the equivalent dose rate over the Shelter object after completion of the New Safe Confinement

2020 ◽  
Vol 19 (4) ◽  
pp. 50-56
Author(s):  
M. V. Saveliev ◽  
◽  
V. A. Krasnov ◽  
A. P. Levchenko ◽  
A. E. Novikov ◽  
...  
Keyword(s):  
Missing Data ◽  
Gamma Radiation ◽  
Dose Rate ◽  
Equivalent Dose ◽  
Data Interpolation ◽  
Equivalent Dose Rate ◽  
Gamma Field

An experiment on measuring the equivalent dose rate over the Shelter object after the completion of the construction of the New Safe Confinement is described. Measurements of the gamma radiation were performed in the time of commissioning of the New Safe Confinement with the help of the sensor installed on its Main Cranes System. The carriage with a sensor was moved by a chaotic trajectory so the method of missing data interpolation was proposed. As a result, a cartogram of the distribution of the gamma field at the level of movement of the bogies of the Main Cranes System of the New Safe Confinement is provided in this paper.

scholarly journals CHANGES OF IONIZING RADIATION CAUSED BY NATURAL RADIONUCLIDES IN THE CURONIAN SPIT

2005 ◽  
Vol 13 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Milda Pečiuliene ◽  
Dainius Jasaitis ◽  
Gražina Grigaliūnaite-Vonsevičiene ◽  
Aloyzas Girgždys
Keyword(s):  
Ionizing Radiation ◽  
Gamma Radiation ◽  
Dose Rate ◽  
Natural Radionuclides ◽  
Ground Surface ◽  
Equivalent Dose ◽  
Curonian Spit ◽  
Equivalent Dose Rate ◽  
Dose Rates ◽  
Numerous Data

Taking into consideration a unique scenery of the Curonian Spit, dosimetric investigation of ionizing radiation caused by natural radionuclides is performed there. The influence of natural radionuclides present in the ground on the equivalent dose rate of gamma radiation in the ground surface air is established. Measurements of equivalent dose rate are carried out in the whole territory of the Curonian Spit in Lithuania. Especially numerous data have been collected on the coasts of the sea and bay, near them, in seaside dunes and by roads. The established equivalent dose rate values vary from 22 nSv/h (on the dune top) to 90 nSv/h (above an asphalt path). The values of the main gamma radiation source (40K and 226Ra) concentration are measured, and positive correlation of concentrations and equivalent dose rates in the ground surface air between 40K and 226Ra is determinated. It is established that 40K has the biggest influence on equivalent dose rate. The equivalent dose rate values in the ground surface air in the Curonian Spit are comparatively low (they can even be 1630 times lower in comparison to Guarapari beach, Brazil).

scholarly journals Влияние зданий на суммарный гамма-фон

2021 ◽  
pp. 100-109
Author(s):  
E. Yeboah ◽  
P. Macdonald ◽  
G. Yakovlev
Keyword(s):  
Gamma Radiation ◽  
Dose Rate ◽  
Scintillation Detector ◽  
Background Radiation ◽  
Equivalent Dose ◽  
Horizontal Distance ◽  
Global Level ◽  
New Approach ◽  
Equivalent Dose Rate ◽  
Gamma Background

The influence of buildings on the total gamma background radiation was investigated. The total gamma radiation between a building made from bricks and a field, which are 100 m apart (away from the influence of other buildings), was measured using a scintillation detector. Measurements of ambient equivalent dose rate at different heights above the soil and a horizontal distance from 0.1 m – 100 m in variable steps were taken. A new approach was developed to assess the contribution of gamma background radiation from the soil and the building to the total gamma background radiation. It was obtained that the gamma background radiation contributed by buildings, greatly affects the total gamma background radiation up to a distance of 2 m, at which there was a significant decrease in the total gamma background radiation. The percentage of the building that contributes to the total gamma background radiation is noted to be between 4 – 29% of the total gamma background. This shows that most of the background radiation in the environment is contributed by the gamma background radiation in the soil. Also, the annual equivalent dose received by a person who sits near the building was 0.09 mSv, which was higher than an adult who works far away from the building (0.08 mSv). Both were however less than the global level. It also was found that the best place to install a detector for measuring gamma radiation was found to be a distance of 1.5 m away from the building. Исследовано влияние зданий на общий гамма-фон. Гамма-фон между кирпичным зданием и полем, находящимся на расстоянии 100 м друг от друга (вдали от влияния других зданий), измерялось с помощью сцинтилляционного детектора. Были проведены измерения мощности амбиентного эквивалента дозы на разной высоте над почвой и на горизонтальном расстоянии от 0,1 м до 100 м с переменным шагом от здания. Был разработан новый подход для оценки вклада от почвы и здания в общий гамма-фон. Было получено, что гамма-излучение, вносимое зданиями, сильно влияет на суммарный гамма-фон на расстоянии до 2 м, на котором наблюдалось значительное уменьшение излучения в общем. Отмечено, что процент вносимого зданием вклада в общий гамма-фон, составляет от 4 до 29%. Это показывает, что большая часть фонового излучения в окружающей среде обеспечивается гамма-излучением почвы. Кроме того, годовая эквивалентная доза, полученная человеком, сидящим рядом со зданием, составила 0,09 мЗв, что выше, чем у взрослого, работающего далеко от здания (0,08 мЗв). Однако оба значения ниже среднемирового. Также было обнаружено, что лучшим местом для установки детектора гамма-излучения будет удаленное на 1,5 м от здания.

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