Distribution of natural radionuclides in the soils and assessment of radiation hazards in the Khrami Late Variscan crystal massif (Georgia)

Kapanadze, Kakhaber; Magalashvili, Archil; Imnadze, Platon

doi:10.1016/j.heliyon.2019.e01377

Cited by 27 publications

(10 citation statements)

References 18 publications

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“…The experiment was conducted in four replicates. For chemical analysis, five samples were taken from each replication (from one container) using the "envelope" method [13]. Data (in tables and in the figure 1) is presented as means.…”

Section: Methodsmentioning

confidence: 99%

The balance of nitrogen forms and number of microorganisms of the nitrogen cycle in vermicomposts based on leaf litter and cow manure

Kurovsky

Kornievskaya

Gummer

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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The processes of nitrogen transformation in the vermiculture system by Eisenia fetida using cow manure and leaf litter (poplar with small birch addition) have been investigated. Vermicomposting was carried out for five months in half-cubic meter wooden containers. The Kjeldahl method and potentiometry determined the total nitrogen, NH4 + and NO3- content in vermicompost. The total nitrogen content in cow manure was 1.83%, in leaf litter - 0.73%. The nitrate and ammonium content in non-composted leaf litter was 351 and 7.3 mEq/kg of dry matter, respectively. The nitrate and ammonium content in non-composted cow manure was 18.2 and 22 mEq/kg, respectively. Both investigated substrates of vermicomposting did not influence total nitrogen content. In cow manure-based vermicomposting system, the ammonium amount decreased by 5.3 times, while the concentration of nitrates increased by 6.5 times. In the leaf litter-based vermicomposting system, the ammonium amount increased by 2.9 times, and the amount of the nitrate increased by 1.6 times. The Azotobacter bacteria actual activity in both vermicomposts was close to 100%. The sum of nitrogen cycle microorganisms in manure vermicompost was 2.4 times higher than in leaf litter vermicompost.

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Section: Methodsmentioning

confidence: 99%

The balance of nitrogen forms and number of microorganisms of the nitrogen cycle in vermicomposts based on leaf litter and cow manure

Kurovsky

Kornievskaya

Gummer

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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“…Values of the calculated assay readings of the Ultra-rugged Super Spec RS-125 were taken after it stabilized against the background radiation with a preset time period of 2 minutes between measurements. In order to get a broad picture of NORs distribution and generation of background radiation, a modified form of the "envelope" method was selected [9]. Five readings in each sampling point were collected from the vertices A, B, C, D of a 4-sided area and its center E (Figure 2) and these were averaged.…”

Section: Assay Measurementsmentioning

confidence: 99%

Background gamma radiation and associated health implications for Ifo-Dagbolu-Ajakaye, Ogun state

Babarimisa

Usikalu

Maxwell

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The need for safe habitat in view of the demands of Sustainable Development Goal 3 - sound health and wellbeing, calls for attention to ascertain the level of exposure of gamma radiation to man and the environment. Keeping the levels of specific activities of naturally occurring radionuclides (NORs) within safety limits will help in attaining the Sustainable Development Goal 3-“Good Health and Well-being”. Background gamma dose rates and activity concentrations of NORs: 40K, 238U, and 232Th in an agrarian settlement, Ifo-Dagbolu-Ajakaye, Ogun State, Southwest Nigeria, was surveyed using an Ultra-rugged Super-spec RS-125 gamma spectrometer. The respective mean values of the background gamma dose rates and specific activities of 40K, 238U, and 232Th were 14.96 nGyh−1; 31.60, 16.54 and 12.91 Bqkg−1. The values of the specific activities were used to estimate the associated radiological health parameters and the values obtained were lower when compared with their corresponding United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) permissible limits. Hence the levels of the activity concentrations of the studied NORs do not present health hazards to the dwellers in the examined station.

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“…The radiation absorbed dose rate, ADR was estimated for radiation risk assessment to quantify the amount of radiation energy that may be deposited per unit time on a potentially exposed person [11]. The absorbed dose rate was calculated using the activity concentration and the conversion factors [14]. The conversion factors for 238 U, 232 Th and 40 K were 0.462, 0.604 and 0.0417 respectively.…”

Section: Ii5 Estimation Of Absorbed Dose Rate (Adr)mentioning

confidence: 99%

Radiological risk assessment of 238U, 232TH and 40K in the top soils of ahero paddy fields of Kisumu county, Kenya

Mukanda¹,

Waswa²,

Ouma³

2022

ITEGAM

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A radiological risk assessment of 238 U, 232 Th and 40 K in the top soils of Ahero paddy fields of Kisumu County has been measured using NaI(TI) gamma ray spectroscopy. A total of 17 samples were collected at a depth of 15 -20 cm and measured for activity concentrations of three radionuclides which were used to calculate the absorbed dose rates and Annual effective dose rates of the samples. Samples were collected from fields at various stages of farming process i.e., four (4) weeks after transplanting (field 1), during transplanting (field 2), after harvesting and land ploughed (field 3) and a control field (field 4) where rice farming had not been done for 2 years. The average activity concentrations for the three radionuclides for field 1 were 32.63 ± 1.63 Bq/kg for 238 U, 104.69 ± 5.20 Bq/kg for 232 Th and 75.00 ± 3.2 6 Bq/kg for 40 K. The average activity concentrations of the radionuclides from field 2 were 16.97 ± 0.84 Bq/kg, 68.03 ± 3.40 Bq/kg and 70.31 ± 3.51 Bq/kg for 238 U, 232 Th and 40 K respectively. The average activity concentrations of the radionuclides from field 3 (post harvesting) were 28.92 ± 1.44 Bq/kg, 91.73 ± 4.58 Bq/kg and 122.60 ± 6.13 Bq/kg for 238 U, 232 Th and 40 K respectively. The average activity concentrations of the radionuclides were 29.74 ± 1.48 Bq/kg, 121.11 ± 6.05 Bq/kg and 87.51 ± 4.37 Bq/kg for 238 U, 232 Th and 40 K respectively. The average Absorbed Dose Rates were 81.50 ± 4.07 nGy/h for field 1, 52.59 ± 2.62 nGy/h for field 2; 74.68 ± 3.73 nGy/h for field 3 and 91.79 ± 4.59 nGy/h for field 4. The values were below the permissible limit of 1500 nGy/h, thus the radiological risk associated with the top soils of the Ahero Paddy fields of Kisumu County, Kenya is insignificant.

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Distribution of natural radionuclides in the soils and assessment of radiation hazards in the Khrami Late Variscan crystal massif (Georgia)

Cited by 27 publications

References 18 publications

The balance of nitrogen forms and number of microorganisms of the nitrogen cycle in vermicomposts based on leaf litter and cow manure

The balance of nitrogen forms and number of microorganisms of the nitrogen cycle in vermicomposts based on leaf litter and cow manure

Background gamma radiation and associated health implications for Ifo-Dagbolu-Ajakaye, Ogun state

Radiological risk assessment of 238U, 232TH and 40K in the top soils of ahero paddy fields of Kisumu county, Kenya

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