The practical basis for a new nuclear resonant reaction is described which has application to a variety of fields including the dating of archaeological materials such as glasses and metals. The reaction ₁H(₁₅N,Ag)₁₂C is used. Although the yield of gamma rays is somewhat lower than other similar reactions, it possesses two major advantages over ₁H(₁₅F,Ag)₁₆O, for example, which is being widely employed for obsidian dating. Firstly, it occurs at about half the beam energy at 6.385 Ö5 0.0005 MeV, and secondly it can be extended to much greater depths (over 3mum). Depth resolution of from 50100 Angstroms is feasible, and hydrogen concentrations of one part per thousand can be detected. Typically, 10-20 data points are needed to reconstruct the diffusion profile, and each takes about 90-120 seconds counting. -- AATA