Figure 2. Radon concentration (Bq/m3) and track density for standard samples

From

Radon Concentration in Some Building Materials in Using CR-39 Track Detector

Laith A. Najam, Nada F. Tawfiq, Rana Hesham Mahmood

International Journal of Physics. 2013, 1(3), 73-76 doi:10.12691/ijp-1-3-3