Determination of Radioactive Contaminant ¹³⁷Cs (Fission Product) and Comparison with Natural ⁴⁰K Present in Mexican Strawberries  

作　　者：Fridda Concepción Fuentes Gama Juan Manuel Navarrete Tejero Alejandro Ramírez Chávez Miguel Ángel Zúñiga Pérez Fridda Concepción Fuentes Gama;Juan Manuel Navarrete Tejero;Alejandro Ramírez Chávez;Miguel Ángel Zúñiga Pérez(Department of Inorganic and Nuclear Chemistry, Faculty of Chemistry, National Autonomous University of Mexico, Mexico City, Mexico)

机构地区：[1]Department of Inorganic and Nuclear Chemistry, Faculty of Chemistry, National Autonomous University of Mexico, Mexico City, Mexico

出　　处：《Journal of Geoscience and Environment Protection》2022年第7期257-265,共9页地球科学和环境保护期刊（英文）

摘　　要：Several previous papers have been published about radioactive contamination in Mexican soil, marine sediments and foodstuffs. Ever since, results have been according to expectation, mainly consisting of natural isotopes in small concentration. Continuous research leads with the surprising finding of fission product ¹³⁷Cs (t_1/2 = 30 years) in strawberries produced in different states, about 2000 km away from each other. Never before, such contaminant has been observed in foodstuffs, produced in this country. The aim of this work is to report the presence of ¹³⁷Cs in Mexican strawberries and compare the activity of such contaminant with the natural radioactivity of ⁴⁰K (t_1/2 = 1.28 × 10⁹ years), through gamma spectrometry. Eventually, the specific activity of ¹³⁷Cs observed in samples FM4, FM5 and FBC is respectively 0.7, 0.8 and 0.3 Bq/kg. The limits established in CODEX-STAN-193-1995 for ¹³⁷Cs are 1000 Bq/kg, so all samples meet the recommendation. It’s presence now in vegetables result with enough interest to be known and considered in the near future to measure the possible effect that radioactive contamination could reach after nearly 80 years from second world war, where no nuclear test has been performed, nuclear accident occurred, neither nuclear weapon has ever been used.Several previous papers have been published about radioactive contamination in Mexican soil, marine sediments and foodstuffs. Ever since, results have been according to expectation, mainly consisting of natural isotopes in small concentration. Continuous research leads with the surprising finding of fission product ¹³⁷Cs (t_1/2 = 30 years) in strawberries produced in different states, about 2000 km away from each other. Never before, such contaminant has been observed in foodstuffs, produced in this country. The aim of this work is to report the presence of ¹³⁷Cs in Mexican strawberries and compare the activity of such contaminant with the natural radioactivity of ⁴⁰K (t_1/2 = 1.28 × 10⁹ years), through gamma spectrometry. Eventually, the specific activity of ¹³⁷Cs observed in samples FM4, FM5 and FBC is respectively 0.7, 0.8 and 0.3 Bq/kg. The limits established in CODEX-STAN-193-1995 for ¹³⁷Cs are 1000 Bq/kg, so all samples meet the recommendation. It’s presence now in vegetables result with enough interest to be known and considered in the near future to measure the possible effect that radioactive contamination could reach after nearly 80 years from second world war, where no nuclear test has been performed, nuclear accident occurred, neither nuclear weapon has ever been used.

关 键 词：Radioactive Contamination 

分 类 号：O57[理学—粒子物理与原子核物理]