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Donnish Journal of Research in Environmental Studies

November 2015 Vol. 2(4), pp. 028-036

Copyright 2015 Donnish Journals




Original Research Article


Measurements of Recycling Steel Slug at Qatar Steel Using Low-level Gamma-ray Spectrometry and Calculation of Risk Factors


A.T. Al-Kinani, M. Hushari*, I.A. Alsadig and Huda Al-Sulaiti

Radiation and Chemical Protection Department, Ministry of Environment, Doha-Qatar.

Corresponding Author's E-mail: mmhushari@moe.gov.qa

Accepted 5th March, 2015.



Abstract


Steel slugs are final by-products in the steelmaking process which may pose an environmental hazard for workers in the vicinity of slag dumps. The objectives of this study are: 1. Using high resolution low-level gamma-ray spectrometry to measure natural occurring radioactive material (NORM) as well as of the artificial isotope 137Cs, in 4 types of steel slug such as Steel Slag loss aggregate, Asphalt Mix (100% steel slag with 4% Bitumen), slag, 50% Gabbro with 4% Bitumen, and Concrete cube (50% steel slag, 50% gabbro. The value of NORM material is reduced when they mixed with gabbro. 2. Calculation of hazard indices such as gamma absorbed dose rate, radium equivalent, external and internal hazard index, annual effective dose equivalent Outdoor), annual effective dose equivalent (indoor), and excess lifetime cancer risk. The values obtained were compared with their corresponding world permissible values, and found to be below the standard limits. 3. Mixing steel slag, with 50% of Gabbro and 4% of Bitumen with asphalt to be used as road base in the construction of 200 m road in Mesaieed city in Qatar. The mechanical and stress-strain measurements were conducted by specialists in civil engineering, then 5 core from the surface to the bottom of road was used to measure (NORM) radioactivity. The measured activity and hazards indices in asphalt mixing with slag lies within the world permissible values. Thus, the use of recycling steel slug can replace aggregates in highway construction and concrete.

Keywords: Steel slugs, Gamma spectrometry, NORM, Hazard indices, Dose equivalent, Core samples.

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Cite This Article:

A.T. Al-Kinani, M. Hushari, I.A. Alsadig and Huda Al-Sulaiti. Measurements of Recycling Steel Slug at Qatar Steel Using Low-level Gamma-ray Spectrometry and Calculation of Risk Factors. Donnish Journal of Research in Environmental Studies 2(4) 2015 pp. 028-036.


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