ARAFIN, S. A. K. Variation Or Radon Activity Of Soil Samples With Colour Using Cr-39 Method. Daffodil International University Journal of Science and Technology, [S. l.], v. 6, n. 2, p. 72–74, 2011. DOI: 10.3329/diujst.v6i2.9348. Disponível em: https://www.banglajol.info/index.php/DIUJST/article/view/9348. Acesso em: 5 may. 2024.