Evaluation of Excess Lifetime Cancer Risk Due to Gamma Rays Exposure from Phosphate Fertilisers Used in Saudi Arabia

IF 1.2 Q3 MULTIDISCIPLINARY SCIENCES

Journal of Physical Science Pub Date : 2019-09-15 DOI:10.21315/jps2019.30.2.5

Fatimh Alshahri

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引用次数: 1

Abstract

Activity concentrations were measured in phosphate fertilisers widely used in Saudi Arabia employing gamma ray spectrometry. The activity concentrations of 238U, 232Th and 40K were used to estimate the excess lifetime cancer risk (ELCR). The obtained data show that 238U and 40K concentrations are higher than the recommended values (35 Bq kg–1 and 400 Bq kg–1 for 238U and 40K, respectively) in most of phosphate fertilisers. The highest value of 238U was 4122 ± 82 Bq kg–1 for diammonium phosphate (DAP) fertiliser. Absorbed dose rate, annual effective dose rate and the ELCR were calculated. The results revealed that the values of outdoor, indoor and total ELCR values were higher than the world averages in all samples except one sample, sample of MAP fertiliser (monoammonium phosphate). The highest value of ELCRtot was for DAP fertiliser which is 50 times higher than the world average value (1.45 × 10–3). Moreover, the results indicated a strong correlation between uranium in phosphate fertilisers and ELCRtot. Based on the obtained results, the direct gamma radiation exposure from phosphate fertilisers is a serious radiological threat to the farmers.

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沙特阿拉伯使用的磷肥的伽马射线暴露导致的过量终生癌症风险的评估

利用伽马射线能谱法测定了沙特阿拉伯广泛使用的磷肥的活性浓度。238U、232Th和40K的活性浓度被用来估计超额终身癌症风险(ELCR)。所得数据表明，在大多数磷肥中，238U和40K的浓度高于推荐值(238U和40K分别为35 Bq kg-1和400 Bq kg-1)。磷酸铵(DAP)肥料中238U的最大值为4122±82 Bq kg-1。计算吸收剂量率、年有效剂量率和ELCR。结果表明:除MAP肥(磷酸一铵)外，其余样品的室外、室内和总ELCR值均高于世界平均水平。其中，DAP肥料ELCRtot最高，为世界平均值(1.45 × 10-3)的50倍。此外，结果表明磷肥中的铀与ELCRtot之间存在很强的相关性。结果表明，磷肥的直接γ辐射暴露对农民造成了严重的放射性威胁。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Physical Science Physics and Astronomy-Physics and Astronomy (all)

CiteScore

1.70

自引率

0.00%

发文量

期刊介绍： The aim of the journal is to disseminate latest scientific ideas and findings in the field of physical sciences among scientists in Malaysia and international regions. This journal is devoted to the publication of articles dealing with research works in Chemistry, Physics and Engineering. Review articles will also be considered. Manuscripts must be of scientific value and will be submitted to independent referees for review. Contributions must be written in English and must not have been published elsewhere.