a) Can you share your spectrum?

b) Do you see all Hf lines or just one of these?

https://www.globalsino.com/EM/image2/1734.JPG

thank you dear Jürgen Weippert . in fact, I have a silica coated wood spect that is good. but on control wood samples there is this Hf peak. there are usually variety of inorganic martials in wood as a sediments in too low amount(less that 0.5 %). but this peak is not normal in related literature

please see attaches file.