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Carlos Omar Pastrana Orejuela

affiliation not provided to SSRN

  • affiliation not provided to SSRN

SCHOLARLY PAPERS

9

DOWNLOADS

245

TOTAL CITATIONS

6

Scholarly Papers (9)

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1.

Intra-Plant Radionuclide Distribution in Cocoa and Nuts: Implications for Dietary Risk Assessment

Number of pages: 30 Posted: 25 Feb 2025
Lucas Faria da Silva, Leandro Barbosa da Silva, Ana Lúcia do Amaral Vendramini, Carlos Omar Pastrana Orejuela, Amaro Gomes Barreto, Inayá Lima, JARDEL LEMOS THALHOFER and Ademir Xavier da Silva
Universidade Federal do Rio de Janeiro (UFRJ), affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Universidade Federal Fluminense and affiliation not provided to SSRN
Downloads 58 (989,921)
Citation 4

Abstract:

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Naturally Occurring Radionuclides (NORM), natural isotopes, natural radioactivity, Gamma spectrometry, nutrient distribution, food radioactivity.

2.

Radiometric Analysis and Implementation of the Brazilian Hazard Index for the Most Used Construction Materials in Popular Dwellings in Brazil

Number of pages: 30 Posted: 18 Sep 2024
Leandro Barbosa da Silva, Carlos Omar Pastrana Orejuela, Lucas Faria da Silva, Jonathan Oliveira dos Santos, Rafael Lima Rodrigues, Alexander Camargo Firmino da Silva, JARDEL LEMOS THALHOFER and Ademir Xavier da Silva
affiliation not provided to SSRN, affiliation not provided to SSRN, Universidade Federal do Rio de Janeiro (UFRJ), affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Universidade Federal Fluminense and affiliation not provided to SSRN
Downloads 40 (1,196,171)
Citation 2

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Activity concentration, NORMs, HPGe, Brazilian hazard index

3.

Radiometric Analysis of Construction Materials Most Used in Brazilian Affordable Dwelling: A Survey and Overview for Establishing Dose and Risk Reference Values

Number of pages: 45 Posted: 13 Nov 2024
Leandro Barbosa da Silva, Alexander Camargo Firmino da Silva, Carlos Omar Pastrana Orejuela, Lucas Faria da Silva, Jonathan Oliveira dos Santos and Ademir Xavier da Silva
affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Universidade Federal do Rio de Janeiro (UFRJ), affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 33 (1,290,922)

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NORM, Equivalent effective dose, \mathrm{\Gamma}ioniz, MCNP 6.3.

4.

Current Activity Concentrations of 226Ra, 232Th and 40K in Sandy Beach Sediments from Rio das Ostras and Associated Health Risks Assessment

Number of pages: 11 Posted: 01 May 2026
Laisa de Almeida Neves, Mirella Maturo da Cruz, Wander Nascimento de Araújo Júnior, Carlos Omar Pastrana Orejuela and Ademir Xavier da Silva
affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 22 (1,509,872)

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Natural Radioactivity, Beach sands, Gamma Spectrometry, radiological hazard, Brazil.

5.

Composition of natural radionuclides, toxic metals, and oxides in flours from Brazilian sociobiodiversity: radiological risk assessment and development of the Radiological Benefit-Risk Index for foods (IRBRF)

Number of pages: 51 Posted: 06 Jan 2026
Lucas Faria da Silva, Eveline Lopes Almeida, JARDEL LEMOS THALHOFER, Carlos Omar Pastrana Orejuela, Leandro Barbosa da Silva and Ademir Xavier da Silva
Universidade Federal do Rio de Janeiro (UFRJ), affiliation not provided to SSRN, Universidade Federal Fluminense, affiliation not provided to SSRN, affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 21 (1,448,301)

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Radiological Benefit-Risk Index for Foods, IRBRF, Natural Radioactivity, food safety, Risk Analysis

6.

Risk assessment and management model for gamma radiation in building materials

Number of pages: 47 Posted: 20 Mar 2026
Lucas Faria da Silva, Leandro Barbosa da Silva, Nancy Baygorrea Cusihuallpa, Carlos Omar Pastrana Orejuela and Ademir Xavier da Silva
Universidade Federal do Rio de Janeiro (UFRJ), affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 20 (1,491,251)

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Radiation exposure time, Risk assessment and management, Cost-Benefit analysis

7.

Analysis of Natural Radioactivity in Engine Lubricant Using an Hpge Detector

Number of pages: 24 Posted: 14 Jul 2025
Rafael Lima Rodrigues, Leandro Barbosa da Silva, Carlos Omar Pastrana Orejuela, Lucas Faria da Silva, Ulrich Michaël Sèdjro Tito and Ademir Xavier da Silva
affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Universidade Federal do Rio de Janeiro (UFRJ), affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 20 (1,459,862)

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engine lubricant, specific activity, Radiological risk, hazard indices, HPGe, NORM

8.

Thermophysical Characterization of Building Materials Due to Radioactive Decay

Number of pages: 47 Posted: 13 Feb 2026
Leandro Barbosa da Silva, Carlos Omar Pastrana Orejuela, Lucas Faria da Silva, JARDEL LEMOS THALHOFER, Caroline Mattos Barbosa, Lucas Dias Rodrigues, Nancy Baygorrea Cusihuallpa and Ademir Xavier da Silva
affiliation not provided to SSRN, affiliation not provided to SSRN, Universidade Federal do Rio de Janeiro (UFRJ), Universidade Federal Fluminense, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 18 (1,500,778)

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gamma spectrometry, Radioactive Heat Production (RHP), XRF, EDX and SEM

9.

A new approach to risk classification of ionizing radiation in building materials

Number of pages: 25 Posted: 20 May 2026
Leandro Barbosa da Silva, Lucas Faria da Silva, Carlos Omar Pastrana Orejuela and Ademir Xavier da Silva
affiliation not provided to SSRN, Universidade Federal do Rio de Janeiro (UFRJ), affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 13 (1,548,648)

Abstract:

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Natural radioactivity, building materials, HPGe gamma spectrometry, Ionizing Radiation Index, NORM, radiation protection, ALARA, risk classification