Baseline and Quality Reference Values for Natural Radionuclides in Soils of Rio de Janeiro State, Brazil

Ribeiro, F. C. A.; Lauria, Dejanira da Costa; Silva, José Ivan Rodrigues; Lima, Eduardo; Amaral, Nelson Moura Brasil do; Pérez, Daniel Vidal

doi:10.1590/18069657rbcs20170146

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…These forest types cover 98% of state territory (Serviço Florestal Brasileiro 2018) at altitudes ranging from 5 to 900 m a.s.l. Even with geographical proximity, these forest types display floristic and structural differences (Nettesheim et al 2010, Bergamin et al 2012 due to the climatic and edaphic gradients that characterize the landscapes (Ribeiro et al 2018, Sobral et al 2018. The climate ranges from tropical to humid subtropical, according to the Köppen classification, with Aw-Tropical Dry Winter and Cwa-Subtropical Hot Summer climates predominating.…”

Section: Study Area and Data Collectionmentioning

confidence: 99%

Tree volume modeling for forest types in the Atlantic Forest: generic and specific models

Cysneiros¹,

Gaui²,

Filho³

et al. 2020

iForest

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National Forest Inventories are important primary data sources for large-scale forest resource surveys, in which volume estimates of sampled trees are essential for quantitative analysis. Volume prediction models in natural forests are scarce in Brazil due to legal restrictions for cutting trees, especially in the Atlantic Forest. This study aimed to fit volume models for the main forest types and timber species of the Atlantic Forest in Rio de Janeiro state, considering two hypotheses: (I) generic volume models provide greater generalizability of estimates; however, (II) they may reduce the accuracy of forest typeand species-specific predictions. Four linear models with logarithmic transformation of variables were evaluated to fit volume models for generic and specific datasets, which correspond to the main forest types and timber species. Goodness-of-fit statistics were calculated to compare the accuracy and efficiency of the models, and selected models were validated through leave-oneout cross-validation procedures. The estimates obtained by generic and specific models were compared by non-parametric hypothesis tests. Generic models showed similar predictions to the specific models for forest types and timber species, with similar potential for stem and total volume predictions. Therefore, generic models can be used for Atlantic Forests in Rio de Janeiro state, while specific models are recommended to obtain more detailed local estimates.

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Section: Study Area and Data Collectionmentioning

confidence: 99%

Tree volume modeling for forest types in the Atlantic Forest: generic and specific models

Cysneiros¹,

Gaui²,

Filho³

et al. 2020

iForest

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“…Although 40 K occurs naturally in soil, its concentration may be formed by the disposal of liquid, air, solid wastes, or industrial waste that produces naturally radioactive materials (NORMs) such as oil, gas production, and many conventional mining and milling industries. Besides, the extensive use of phosphate fertilizers in cultivated soils can also be a potential source of natural radionuclides (27).…”

Section: The Activity Of 226 Ra 232 Th and 40 K Radionuclidesmentioning

confidence: 99%

The Natural Radionuclide Activity and the Risk of Potential Radiation in Health Effect: A Study on Beach Sand in Madura, Bali, and Lombok

Priasetyono

Makmur

Prihatiningsih

et al. 2021

JKL

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Introduction: Beach sand is one of the widely used aggregates in construction, especially in coastal areas. However, beach sand contains a hidden risk, namely radioactive hazards. This research will analyze the radioactive activity of nuclides 226Ra, 232Th, and 40K on beach sand and calculate the health risk potential in radiation exposure to the household. Methods: Beach sands sampling was carried out on Madura Island, Bali, and Lombok in 2016. All samples were ovensifted and then put into Marinelli to be chopped using high-purity germanium (HPGe) gamma-ray detectors for three days. Results and Discussion: The average of 226Ra, 232Th, and 40K radionuclide activity on the beach sand in Madura were respectively 31.46 Bq/kg, 40.12 Bq/kg, and 334.04 Bq/ kg; in Bali were 25.10 Bq/kg, 7.71 Bq/kg, and 165.15. Bq/kg; and in Lombok the amount is 25.88 Bq/kg, 8.25 Bq/kg and 171.99 Bq/kg. The calculation of the radium equivalent (Raeq) value on beach sand in Madura, Bali, and Lombok has the highest value of 132.72 Bq/kg, 54.06 Bq/kg, and 55.92 Bq/kg. The gamma index (I) in Madura, Bali, and Lombok was 1.02; 0.39; and 0.40. For the calculation of Hex and Hin in Madura, Bali, and Lombok, the highest were 0.38; 0.15; 0.15; and 0.48; 0.23; 0.24. Conclusion: The activity of the three types of natural radionuclides from the three regions is still below the threshold value. Analysis of potential health risks showed in the gamma index value (I) indicator, which exceeds the safe threshold in the Madura beach sand sample.

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Advances in the management of radioactive wastes and radionuclide contamination in environmental compartments: a review

Adeola

Iwuozor

Akpomie

et al. 2022

Environ Geochem Health

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Baseline and Quality Reference Values for Natural Radionuclides in Soils of Rio de Janeiro State, Brazil

Cited by 9 publications

References 25 publications

Tree volume modeling for forest types in the Atlantic Forest: generic and specific models

Tree volume modeling for forest types in the Atlantic Forest: generic and specific models

The Natural Radionuclide Activity and the Risk of Potential Radiation in Health Effect: A Study on Beach Sand in Madura, Bali, and Lombok

Advances in the management of radioactive wastes and radionuclide contamination in environmental compartments: a review

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