Yadav, P. N., P. Rajbhandari, and K. K. Shrestha. 2013. “Estimation of Concentration of K-40 by Gamma Spectroscopy and Atomic Emission Spectroscopy in the Environmental Samples of Northern Kathmandu Valley”. Journal of Nepal Chemical Society 29 (December):75-80. https://doi.org/10.3126/jncs.v29i0.9255.