## 3 Results and Discussion
### Photon Emission
When analyzing the dynamics of photon emission in relation to the exposure time, it should be noted that in both analyzed cases it was on average about 17% for each of the six 100 s time intervals. Therefore, the dynamics of photon emission cannot be used as a measure differentiating the examined eggs, because of the criteria assumed in the research. Due to the production processes, qualitative identification of the substrate should be carried out with division into product components. Figure 2 shows the structure of recorded photons during the experiment from egg yolks obtained from hens from caged hens (dashed line--red color), and egg yolks obtained from free-range hens (dashed line--blue). The results presented were similar to those of whole eggs for emission time intervals of 100 s, which allowed for precise determination of photon emission variation over the time, the course of which may be an important factor in parameterization. It was found that the biggest difference in photon emission between the tested egg groups occurred in the third exposure interval, i.e., 201-300 s, amounting to 35.3%, which, in absolute terms, broke out on 23.5 photons, which can be used to identify the origin of egg yolks. It should be noted that throughout the experiment's time interval, the emission of photons from egg yolks from free range hens was higher than the parameter recorded among egg yolks from caged eggs. Therefore, it should be stated that the obtained results were similar to the results obtained using traditional methods (sum of carotenoids, \(\beta+\gamma\)-tocopherol, \(\delta\)-tocopherol), where the total number of photons emitted was 326, 65 photons higher than the emission recorded  
Figure 1: Characteristics of photon emissions as a function of the exposure time of whole eggs obtained from free-range housing (blue) and caged housing (red). Figure 2: Characteristics of photon emission as a function of exposure time of egg yolks obtained from free-range housing (blue) and cage housing (red). for egg yolks from cage-housing hens, which confirms the correctness of the choice of the assessment method and its possible practical use. The unitary average photon emission for egg yolks from free-range hens was 0.54 photon/s, and for egg yolk from hens from caged hens, 0.43 photon/s. Analyzing the dynamics of photon emissions, it was observed that for egg yolks from hens of cage housing, the second time interval (101-200 pp.) is crucial, where photon emission accounted for over 21% of their total number. In the case of egg yolks from free-range hens, the key time-related interval was 201-300 s, where the sum of identified photons was 20% of the total number of photons counted in the entire 600 s measurement cycle. The differentiation of the photon emission structure during the material exposure indicates a differentiation of the properties of the tested material, however, the parameterization of these changes requires additional research. A slightly different photon emission curve as a time function in relation to the above-mentioned research objects was characterized by egg white of hens (Figure 3), because there was a large convergence in the shape of the photon emission curve between the egg white obtained from hen eggs from caged housing (red line) and the egg white from free-range housing (blue line). This statement does not refer to the sum of recorded photons in the first time interval (0 to 100 s). In the interval where the relative difference in the number of photon emissions by the egg white between the analyzed hen housing groups was 34.2%, the total number of photons allows the differentiation of egg white in terms of housing. However, it also should be noted that the emission of photons from egg white from free-range hens was higher throughout the whole experiment's time interval, which coincides with the results obtained using an alternative identification method and confirms the suitability of the method based on counting individual photons.