@techreport{oai:soar-ir.repo.nii.ac.jp:00016997, author = {檀原, 宏 and 建石, 繁明 and 馬場, 多久男}, month = {Mar}, note = {:M any elements (Na ,K ,M g,C a,…… etc) in biological materials have been deternmined usually by atomic absorption spectrophotometry (AAS),a s it is easer than other methods. However,thermal neutron activation analysis (NAA) is able to obtain the data of these elements concentration simaltaneously when other many elements are determined. This striking featureis charmful for our pourpose. Thus the analytical data of elements (Na,K ,M g,C a,M n,F e,a nd Zn) concentrationdetermined in grass by these two technics were compared Grass samples were collected from Shinshu highland area and dried then prepared for element analysis. NAAt echnics was performed at the Research Reactor Institute,K yoto University and AAS instrument was used in Shinshu University. As the result,s ix elements (Mg,K ,C a,M n,F e and Zn) concentration showed almost equal valuesdetermined with NAAa nd AAS menthod,bu t Na presented NAA