Author(s)

Karla Fernández, Juan Manuel Navarrete, Miguel Angel Zúñiga, Ernesto Hernández

Department of Inorganic and Nuclear Chemistry, Faculty of Chemistry, National Autonomous University of Mexico, Mexico City, Mexico.

Marine sediments contamination by fission product ¹³⁷Cs-^137mBa is a fact since the period 1945-65, when plus than two thousand atomic explosion tests were performed mainly in the southern seas, earth region with minor population density. However, marine flows have produced dissemination of this radioactive pair through the sea bottom all over the world, at different levels, because the sea movement and natural decaying of radioactive pair: parent ¹³⁷Cs (t_1/2 = 30.17 years) and daughter ^137mBa (t_1/2 = 2.55 minutes). Radioactive detection of these contaminants, compared as percentage with that of natural ⁴⁰K (t_1/2 = 1.28 × 10⁹ years, 0.0118% of elementary K) leads to radiation contamination factor (RCF), as one possible unit to measure the radioactive contamination intensity in different regions, as well to determine if there is some other possible source of this contaminant, for example water cooling from power nuclear reactors when it is discharged at sea. However, radioactive detection always implies an unavoidable statistical variation, which makes more difficult to appreciate the changes as function of time and region. But at beginning of this century, mass spectrometry has got impressive advances, which makes it much more precise and sensible than radioactive detection [1]. This paper attempts to measure with other units the radioactive contamination: ¹³⁷Cs atoms number per gram of sample, instead radioactivity, which could be more direct and with minor standard deviation that radioactive detection, solving at same time the isobars separation: ¹³⁷Cs versus ^137mBa plus elementary ¹³⁷Ba (11.23% of Ba element).

Isobars, Separation, ¹³⁷Cs-^137mBa-¹³⁷Ba

Fernández, K. , Navarrete, J. , Zúñiga, M. and Hernández, E. (2020) Isobars Separation (¹³⁷Cs-^137mBa-¹³⁷Ba) from Marine Sediments, in Order to Evaluate Directly Their Radioactive Contamination by Mass Spectrometry. World Journal of Nuclear Science and Technology, 10, 32-38. doi: 10.4236/wjnst.2020.101004.