নিউট্ৰন উষ্ণতানিউট্ৰন তৰা
নিউট্ৰন এক্তিভেছন বিশ্লেষণ (Assamese)
1. Neutron activation analysis (NAA) is a nuclear process used for determining the concentrations of elements in many materials. NAA allows discrete sampling of elements as it disregards the chemical form... from wikipedia.org