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Environmental Alpha Radiation from the Soil at a Prehispanic Ancient Sacred Site in Lima, Perú

Díaz Félix, Liza Rafael, Rojas Jhonny, Pereyra Patrizia, Lopez Maria Elena, Palacios Daniel, Sajo-Bohus Laszlo, Benites Santiago

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 9

291--299

In the present work, we investigate the concentration of radon and its alpha-emitting progeny at the archaeological site of Huaca 20 in Lima, Peru. The site holds significant cultural and historical importance as an ancient pre-Inca ruin, providing valuable insights into the lives and rituals of its former inhabitants. We quantified the radon levels accurately with passive CR-39TM detectors deployed within specially designed chambers at the site for 28 days. In a controlled laboratory environment, we processed the detectors afterward, examining and analyzing the resulting tracks using advanced microscopy and the ImageJ analysis software. The ground-level concentration of radon and its alpha-emitting progeny was determined, revealing elevated levels ranging from 2.4 ± 0.6 to 8.9 ± 0.9 (kBq/m3 ). These findings underscore the unique presence of radon at Huaca 20 and highlight the potential impact on microorganisms at ground level. Likewise, these results can contribute to studies on the radiological risks faced by visitors, excavators and archaeologists. Finally, we show the spatial distribution of radon concentrations within the site by creating an iso-concentration map. The iso-concentration map reveals a relation between areas with elevated radon levels and the good preservation of funerary contexts.

Szybkość uwalniania się 222Rn z wód podziemnych do atmosfery

Przylibski Tadeusz A., Maciejewski Piotr, Zagożdżon Katarzyna D., Zagożdżon Paweł P.

Przegląd Geologiczny

2022

Vol. 70, nr 10

742--750

The authors conducted studies on the release rate of 222Rn from groundwater flowing out of a spring, from metamorphic reservoir rocks. This source gives rise to a stream about 205 m long. The activity concentration of Rn in the spring was about 700 Bq/dm33, took place at a distance of about 1 70-180 metres from the spring. With regard to the waterflow path, flowtime and the volume of water flowing through the cross-section of the tested stream, the exhalation coefficient of222Rn from water to atmospheric air is 3.80 Bq/dm3/m, 1.51 Bq/dm3/s and 1. 25 Bq/dm3/dm3, respctively. According to the authors, further research conducted in other springs occurring in other types of rocks and under different flow conditions (at different times of the year) will allow characterizing the dynamics of the process of222Rn release from groundwater through surface waters into the atmosphere. Perhaps this process can be described with a universal mathematical function.