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Please use this identifier to cite or link to this item: http://bsuir.bsum.edu.ng:8080/jspui/handle/11409/720

Title: ANALYSIS OF NATURAL RADIOACTIVITY AND DOSE ASSESSMENT ON DIFFERENT BRANDS OF CHEMICAL AND ORGANIC FERTILIZERS USED IN BENUE STATE, NIGERIA
Authors: KUNGUR, SAMUEL TERHEMBA
Keywords: ANALYSIS, CHEMICAL
NATURAL RADIOACTIVITY, DOSE ASSESSMENT, DIFFERENT BRANDS, ORGANIC FERTILIZERS
Issue Date: 24-Feb-2021
Abstract: To determine the concentrations and radiological hazards of fertilizers and agricultural soils in Benue State, the concentrations of natural radionuclides Radium-226, Thorium-232 and Patassium-40 in chemical and organic fertilizers and nine (9) soil samples were measured using a Nal (TI) detector and Multichannel Analyzer. The average concentrations of the radionuclides in the chemical fertilizer samples were 69.55±2.97, 17.84±1.09 and 969.13±5.48Bq/kg, while for the organic fertilizers, the concentrations were 26.33±3.78, 9.07±0.94 and 204.43±4.34Bq/kg. This result showed that the average activity concentrations of the radionuclides are higher in the chemical fertilizer samples than the organic fertilizer samples. For the soil samples, the average activity concentration of 226Ra, 232Th and 40K were 39.10±2.67, 29.44±0.99 and 113.02±2.78Bq/kg for the samples in zone A, 41.86±3.03, 8.14±0.35 and 404.24±5.92Bq/kg, 22.48±1.92, 8.93±0.25 and 164.58±2.06Bq/kg for samples in zones B and C. These concentrations show that 226Ra and 40K are most prevalent in zone B, while 232Th is prevalent in zone A. Zone C has the least 226Ra concentration and 232Th slightly higher than zone B and 40K higher than zone A, but less than zone B. The average values of the radium equivalent for all the soil and fertilizer samples were determined and found to be lower than the maximum permissible limit for radiation dose of 370Bq/kg given by UNSCEAR. The average absorbed dose rate for the chemical fertilizer samples was 88.33nGy/h, while that for the organic samples was 26.17nGy/h. Those for the soil samples were 40.5nGy/h, 39.6nGy/h and 22.6nGy/h for zones A, B and C. These values are below the world average permissible value of 57nGy/h, except those of the chemical fertilizer samples. The values of the index of external and internal hazards were found to be 0.46 and 0.65 for the chemical fertilizer samples, 0.15 and 0.22 for the organic samples, and 0.24 and 0.35, 0.22 and 0.33, 0.13 and 0.19 for the soil samples from zone A, B and C. All these indices are within the world acceptable limit of less than unity. The average annual absorbed dose rates of the samples were 10.22mSv/y and 3.21mSv/y for the chemical and organic fertilizer samples, while those for the soil samples were 5.0mSv/y, 4.9mSv/y and 2.8mSv/y for zones A, B and C. All the values are above the lmSv/y acceptable dose limit. The obtained average values were compared with available reported data for other countries. The ANOVA showed that there are significant differences in means of the radioactivity from the chemical and organic fertilizer samples. For the soil samples, there is a significant difference the in means of the radioactivity from the samples from zone B than that of zones A and C. Results of the study could serve as an important baseline radiometric data for the monitoring of environmental radioactivity in the study area.
Description: ANALYSIS OF NATURAL RADIOACTIVITY
URI: http://bsuir.bsum.edu.ng:8080/jspui/handle/11409/720
Appears in Collections:Physics

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