Contribution of ⁴⁰K arising from agropastoral activities to the total effective dose by plant ingestion in the Far-North, Cameroon

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Abstract

This study assesses the level of radioactivity, its corresponding dose and risk in areas of intense agropastoral activities in the Mayo-Sava, Mayo-Tsanaga and Mayo-Kani Divisions of the Far North region of Cameroon. The ultimate aim is to show that beyond the geological structure and mineralogical composition of the soil, agricultural fertilizers and animal droppings from livestock farming can contribute significantly to the elevation of the⁴⁰K-induced radioactivity level in an environment. Natural radionuclide analysis was carried out on 55 soil samples collected from the three aforementioned localities, using a laboratory NaI (Tl) gamma spectrometer. The mean activity concentrations of²³⁸U,²³²Th and⁴⁰K were 41, 59 and 529 Bq/kg respectively. The total effective dose to the public and the risk of cancer morbidity were generated by RESRAD-ONSITE code version 7.2. The 0.7 mSv/year maximum total effective dose was estimated at time 𝑡= 38 years, with contributions of 56%, 37.3%, 3.9%, 2.1%, 0.7% and 0.07% from plant ingestion, external exposure, meat ingestion, milk ingestion, soil ingestion and inhalation, respectively. Potassium-40 (⁴⁰K) from plant ingestion is the major contributor. The doses in the initial year of agropastoral activity and the total excess cancer risk were 0.3 mSv/year and 1.165×10^-3 respectively. The⁴⁰K contributions to effective dose from plant ingestion obtained in this work are high compared to areas where agropastoral activities are not intensive. This may be due to the various fertilizers and animal droppings distributed in nature which are very rich in potassium. Although potassium is essential to life, it is nevertheless necessary for radiation protection to take into account this type of radiological exposure which is not without harmful effects on the environment and health.

Keywords

effective dose / agropastoral activities / cancer morbidity risk / fertilizer / ⁴⁰K / RESRAD- ONSITE / plant ingestion

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References

[1] United Nations Scientific Committee on the Effects of Atomic Radiation (2008) UNSCEAR 2000 report Vol I: Sources and effects of ionizing radiation .

[2] Bineng GS, Hosoda M, Siaka YFT, et al. (2020) External radiation exposure to the public using car-borne survey method in the uranium and thorium bearing region of Lolodorf, Cameroon. Radiation Environment and Medicine 9: 13-20.

[3] Shafik SS, Alattabi HD, Jabbar FTA (2020) Measurement of Radioactive Potassium-40 to Specify Potassium Element in Wheat and Its Derivatives for Wasit Governorate-Iraq. In IOP Conference Series: Materials Science and Engineering 928: 072039. https://doi.org/10.1088/1757-899X/928/7/072039

[4] Ministry of Agriculture and Rural Development of Cameroon, Department of Agricultural (2012), Surveys and Statistics, AGRI-STAT N° 17.

[5] Bassala JPO, M’Biandoun M, Ekorong JA, et al. (2008) Soil fertility evolution in a cotton-cereal system in North Cameroon: diagnosis and perspectives. Sommaire/inhoud/sumario 26: 240-245 (in French).

[6] Dinissia J, Tcheunteu LT, Maimouna A, et al. (2021) Onion production diagnosis in the northern part of Cameroon. International Journal of Biological and Chemical Sciences 15: 923-935 (in French). https://doi.org/10.4314/ijbcs.v15i3.7

[7] Chang HY, Hu YW, Yue CSJ, et al. (2006) Effect of potassium-enriched salt on cardiovascular mortality and medical expenses of elderly men. The American journal of clinical nutrition 83: 1289-1296. https://doi.org/10.1093/ajcn/83.6.1289

[8] Saïdou, Bochud FO, Baechler S, et al. (2011) Natural radioactivity measurements and dose calculations to the public: case of the uranium-bearing region of Poli in Cameroon. Radiation Measurements 46: 254-260. https://doi.org/10.1016/j.radmeas.2010.11.009

[9] Ben-Bolie GH., Ele Abiama P, Owono Ateba P, et al. (2013) Transfer of²³⁸U and²³²Th from soil to plant in a high background radiation area of the southwestern region of Cameroon . Radiation protection dosimetry 157: 298-302. https://doi.org/10.1093/rpd/nct141

[10] Mvondo S, Ben-Bolie GH, Ema'a JEA, et al. (2017) Study of soil-fern transfer of naturally occurring alpha emitting radionuclides in the Southern Region of Cameroon. Journal of environmental radioactivity 180: 114-119. https://doi.org/10.1016/j.jenvrad.2017.10.007

[11] Mvondo S, Beyala Ateba JF, Ben-Bolie GH, et al. (2018) Dose estimates to the public due to 210Po ingestion via cocoa powder from Lolodorf high background radiation area, Cameroon. Radioprotection 53: 193-198. https://doi.org/10.1051/radiopro/2018022

[12] Arnoldy A, Martin R, Frédéric A (2016) Contribution to the radioactivity study of cocoa beans in Madagascar, case of the Sambirano-Ambanja plain. American Journal of Innovative Research and Applied Sciences 3: 520-528 (in French).

[13] Asimanana F (2014) Determination of radionuclides in food. Application to the culinary arts in Madagascar. Afrique Science: Revue Internationale des Sciences et Technologie 10 (in French).

[14] Atlas of the Far-North Province of Cameroon, Paris, IRD Editions, 2005, 171.

[15] Brabant P, Gavaud M (1985) Soils and land resources of North Cameroon (Northern and Far North Provinces): Maps at 1/500 000-northern sheet: Maroua-Kousseri-southern sheet: Garoua.

[16] Mainam F (1999) Modelling soil erodibility in the semiarid zone of Cameroon: assessment of interrill erodibility parameters for mapping soil erosion hazard by means of GIS techniques in the Gawar area (Doctoral dissertation, Ghent University).

[17] Braun JJ, Pagel M (1994) Geochemical and mineralogical behavior of REE, Th and U in the Akongo lateritic profile (SW Cameroon). Catena 21: 173-177. https://doi.org/10.1016/0341-8162(94)90010-8

[18] Champetier de Ribes G., Reyre D (1959) Geological reconnaissance map of Cameroon at 1/500,000 scale, Feuile Yaoundé-Ouest, with explanatory note, Imprimerie de Rébon, Paris, France, 31.

[19] National Institute of Statistics “ Cameroon Statistical Yearbook” (2019) Chapter 14: Farming and Fishing, 11 (in French). https://ins-cameroun.cm/wp-content/uploads/2021/02/File PDF.

[20] Canberra, GENIE 2000-Gamma spectrometry software, version 3.2. https://www3.nd.edu/~wzech/Genie 2000

[21] Guidebook A, Measurement of Radionuclides in Food and the Environment. Vienna: International Atomic Energy Agency, 1989. Available from: https://www.iaea.org/publications/1398/measurement-of-radionuclides-in-food-and-the-environment.

[22] Yu C, Kamboj S, Cheng JJ, et al. (1999) Applications of RESRAD family of computer codes to sites contaminated with radioactive residues (No. ANL/EA/CP-99411). Argonne National Lab., IL (US).

[23] Yu C (2006) Modeling radionuclide transport in the environment and assessing risks to humans, flora, and fauna: The RESRAD family of codes. https://doi.org/10.1021/bk-2007-0945.ch005

[24] Andráš P, Dirner V, Horňáková A (2011) Determination of (238) U,(232) Th And (40) K activity in the rocks used in civil engineering from the Male Karpaty Mts.(Slovakia).

[25] Mekongtso Nguelem EJ, Moyo Ndontchueng M, Motapon O (2016) Determination of²²⁶Ra,²³²Th, 40K, 235U and 238U activity concentration and public dose assessment in soil samples from bauxite core deposits in Western Cameroon. SpringerPlus 5: 1-12. https://doi.org/10.1186/s40064-016-2895-9

[26] Uosif MAM, El-Taher A, Abbady GA (2008) Radiological significance of beach sand used for climatotherapy from Safaga, Egypt. Radiat Prot Dosim 131: 331-339.

[27] Kall B, Tombo T, Rasolonirina M, et al. (2015) Contribution to the study of dose due to gamma radioactivity of the soil on the shore of the Baie des Français, Antsiranana, Madagascar. Africa Science: International Journal of Science and Technology 11: 122-135 (in French).

[28] Saïdou, Abiama P, Tokonami S (2015) Comparative study of natural radiation exposure to the public in three uranium and oil regions of Cameroon. Radioprotection 50: 265-271. https://doi.org/10.1051/radiopro/2015017

[29] Takoukam S, Hosoda M, Ndjana NI, et al. (2018) Natural radioactivity measurements and external dose estimation by car-borne survey in Douala city, Cameroon. Radioprotection 53: 255-263. https://doi.org/10.1051/radiopro/2018032

[30] Engola LN, Nkoulou II JEN, Hosoda M, et al. (2018) Air absorbed dose rate measurements and external dose assessment by car-borne survey in the gold mining areas of Betare-Oya, Eastern-Cameroon. Healthy physics 53: 5-11. https://doi.org/10.5453/jhps.53.5

[31] Penabei S, Bongue D, Maleka P, et al. (2018) Assessment of natural radioactivity levels and the associated radiological hazards in some building materials from Mayo-Kebbi region, Chad. Radioprotection 2018 53: 265-278. https://doi.org/10.1051/radiopro/2018030

[32] Jalloh A, Roy-Macauley H, Sereme P (2012) Major agro-ecosystems of West and Central Africa: Brief description, species richness, management, environmental limitations and concerns. Agriculture, ecosystems & environment 157: 5-16. https://doi.org/10.1016/j.agee.2011.11.019

[33] Nkoulou II JEN, Talla SF, Bineng GS, et al. (2018) Natural radioactivity measurements in soil, external dose and radiological hazard assessment in the uranium and thorium bearing region of Lolodorf, Cameroon. Radioisotopes 67: 435-446. https://doi.org/10.3769/radioisotopes.67.435

[34] Saïdou, Abiama P, Tokonami S (2015) Comparative study of natural radiation exposure to the public in three uranium and oil regions of Cameroon. Radioprotection 50: 265-271. https://doi.org/10.1051/radiopro/2015017

[35] Beyala Ateba JF, Owono Ateba P, Ben-Bolie GH, et al. (2011) Determination of Uranium in Rocks and Soils of South Cameroon by γ-ray Spectrometry. Radioisotopes 60: 399-408. https://doi.org/10.3769/radioisotopes.60.399

[36] Abiama PE, Ateba PO, Ben-Bolie GH, et al. (2010) High background radiation investigated by gamma spectrometry of the soil in the southwestern region of Cameroon. Journal of environmental radioactivity 101: 739-743. https://doi.org/10.1016/j.jenvrad.2010.04.017

[37] Minerals: their deposits, their associations (Vol. 1). Minerals and fossils.

[38] World Health Organization (2009) WHO handbook on indoor radon: a public health perspective. World Health Organization .

[39] Ziajahromi S, Khanizadeh M, Nejadkoorki F (2015) Using the RESRAD code to assess human exposure risk to²²⁶Ra,²³²Th, and⁴⁰K in soil. Human and Ecological Risk Assessment: An International Journal 21: 250-264. https://doi.org/10.1080/10807039.2014.909194