Figure 2From: Quantification of calcium content in bone by using ToF-SIMS–a first approach XPS survey spectrum and cross correlation for surface and bulk concentrations. a) Exemplary XPS survey spectrum of a mineralised scaffold showing the five compositional elements Ca, P, N, C, O and b) the linear relationship of the HAP content evaluated by XPS versus the HAP content determined by ignition residue of the mineralised collagen standards.Back to article page