Fig. 5

Attenuation curve of the print material ZP150 (3DSystems GmbH). The transmission is defined as follows: \( {\text{T}} = \frac{{{\text{KERMA}}_{\text{x}} }}{{{\text{KERMA}}_{0} }} \) with \( {\text{KERMA}}_{0} \): no material between X-ray tube and ionisation chamber and \( {\text{KERMA}}_{\text{x}} \): x mm material between X-ray tube and ionisation chamber