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. Laser materials processing of workpieces using ultra-short pulsed lasers can lead to unwanted X-ray emission. Their dose rate and spectral distribution have been precisely determined. The measurements werecarried out using a thermoluminescence detector (TLD)-based spectrometer in which 30 TLD planes are arranged one behind the other, the first 10 layersmade of polymethyl methacrylate, while the remaining 20 layers are interspaced by absorbers with, from the front to the back, increasing atomiccharge and thickness. The penetration depth of the radiation into thespectrometer depends on its energy, so that the energy-resolved spectrum ofthe radiation can be calculated from the TLD dose values by means ofmathematical methods (Bayesian deconvolution). The evaluation process alsotakes into account both the uncertainties of all input quantities and thepossibility of adopting different models for the spectrum form. This allowedthe resulting spectra to be associated with their realistic uncertainty. The measurements are traceable to the Systeme international d'unites (SI), i.e. the International System of Units. The results not only provide manufacturers and users of ultra-short pulsed lasers with important information on the design of the machines with regard to radiationprotection, but were also included in the recently concluded legislative procedure in the field of radiation protection in Germany.

Measurements at laser materials processing machines: spectrum deconvolution including uncertainties and model selection