Figure 2. Geographical location of LR 115 detectors used in 222Rn monitorin

From

Concentration Measurements of Radon 222 Indoors in Lima – Peru

P. Pereyra, M.E. López, L. Vilcapoma

International Journal of Physics. 2015, 3(4), 165-169 doi:10.12691/ijp-3-4-5