@misc{54806, author = {Larry Lucas and Leticia Pibida}, title = {New Spherial Gamma-ray and Neutron Emitting Sources for Testing of Radiation detection Instruments}, year = {2009}, number = {114}, month = {2009-11-30}, publisher = {Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD}, url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903127}, language = {en}, }