NDLI: Enhancement of natural radioactivity in fertilized soil of Faisalabad, Pakistan.

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Enhancement of natural radioactivity in fertilized soil of Faisalabad, Pakistan.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tufail, M.
Spatial Coverage	Pakistan
Description	Country affiliation: Pakistan Author Affiliation: Nasim-Akhtar ( Nuclear Institute for Agriculture and Biology, Jhang Road, Faisalabad, Pakistan. drnasimakhtar@rocketmail.com)
Abstract	UNLABELLED: BACKGROUND, GOAL, AND SCOPE: Natural radioactivity in phosphate rock (PR) is transferred to phosphate fertilizer (PF) during the manufacturing process of the PF. The continuous addition of the PF to the cultivated soil accumulates the radionuclides in the land and increases the level of radioactivity in the soil. The purpose of the present study was to investigate the enhanced level of accumulated radioactivity due to the continuous addition of the PF in the farmlands of Nuclear Institute of Agriculture and Biology (NIAB) at Faisalabad in Pakistan. The selected study area consisted of the highly fertilized farmlands and an unfertilized barren land of the NIAB. INTRODUCTION: The understudy area is very fertile for the growth of various types of crops; therefore, four agricultural research institutes have been established at Faisalabad and NIAB is one of those. The NIAB has developed various research farmlands at different places in Pakistan. The crop yield has been increased by adding various fertilizers in the farmlands. The addition of the PF accompanied with the radionuclides enhances radioactivity in the fields. Human being is exposed directly or indirectly to this radiological hazard. A prolong exposure may become a cause of health risk. MATERIALS AND METHODS: The area of study consisted of three types of lands: the land under cultivation for the last 40 and 30 years called Site 1 and Site 2, respectively, and the barren land was called Site 3. A total of 75 soil samples were collected within the crop rooting zone (up to 25 cm deep) of the soil of the NIAB farms. The samples were dried, pulverized to powder, sealed in plastic containers, and stored to achieve equilibrium between (226)Ra and (222)Rn. Activity concentrations of the radionuclides (238)U ((226)Ra), (232)Th, and (40)K in soil samples were determined by using a high resolution gamma ray spectrometry system, consisting of an high purity germanium detector coupled through a spectroscopy amplifier with a PC based MCA installed with Geni-2000 software. RESULTS: The measured activity concentration levels of (40)K were 662 ± 15, 615 ± 17, and 458 ± 20 Bq kg(-1), (226)Ra were 48 ± 6, 43 ± 5, and 26 ± 4 Bq kg(-1), and that of (232)Th were 39 ± 5, 37 ± 5, 35 ± 5 Bq kg(-1), respectively, in the soil of the Sites 1, 2, and 3. Gamma dose rate 1 m above the soil surface was 55, 51, and 40 nGy h(-1) from Sites 1, 2, and 3, respectively. External dose rates in the rooms constructed of the bricks made of the soil from Sites 1, 2, and 3 were 161, 149, and 114 nGyh(-1), respectively. DISCUSSIONS: Activity concentration values of (40)K and (226)Ra in the soil of Sites 1 and 2 were higher than that in the soil of Site 3. The relative rise of (40)K was 43 % and 34 % and that of (226)Ra was 85 % and 65 % respectively in these sites. Activity concentrations of (232)Th in all these sites were in the background range. Gamma dose rate 1 m above soil surface of Sites 1 and 2 was 40 % and 30 % respectively higher than that from the soil of Site 3. The rise in activity of (40)K and (226)Ra and gamma dose from the Site 1 was greater than that from the Site 2. The least activity and dose were observed from the Site 3. Gamma dose in the dwellings made of fertilized soil bricks of Site 1 and Site 2 were respectively calculated to be 41 % and 32 % higher than that in the abodes made of unfertilized soil bricks of Site 3. CONCLUSIONS: Activity concentrations of (226)Ra and (40)K were observed to be enhanced in the fertilized farmlands of the NIAB. Outdoor and indoor gamma dose as radiological hazard were found to be increasing with the continuous addition of PF in the understudy farmlands. RECOMMENDATIONS: It is recommended that naturally occurring radioactive metal should be removed during the process of manufacturing of the PF from the PR. PROSPECTIVE: The rise in radioactivity in the farmlands due to the addition of the PF can be a source of direct or indirect exposure to radiation that may enhance cancer risk of the exposed individuals.
ISSN	09441344
Issue Number	8
Volume Number	19
e-ISSN	16147499
Journal	Environmental Science and Pollution Research
Language	English
Publisher	Springer
Publisher Date	2012-09-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fertilizers Phosphates Chemistry Soil Pollutants, Radioactive Analysis Soil Background Radiation Pakistan Radioisotopes Spectrometry, Gamma Journal Article Research Support, Non-u.s. Gov't Discipline Environmental Science Discipline Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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