## 4 Results  
The 156 publications retrieved from the Scopus database were analyzed for the year of publication by country or territory, subject area, and document by type. The first bibliometric analysis concerns publications by year (Figure 2). It can be noticed that there was a year-by-year growth in the interest in CBRN innovations; the peak was in 2020. Search results for 2022 are for the first quarter only. It can be implied that the pandemic situation might trigger interest, particularly in biological hazards and their countermeasures, or the number of policies and programs (e.g., European Commission) that were in line with sustainable development. Alternatively, chemical threats such as Syrian chemical weapons activity noticed since 2012 [37] or terrorist attacks [38]  
Figure 1: Research process design. Figure 2: The number of documents by year. may trigger interest. Further observation of the timeline is required to state if there is a drop or increase in interest after the indexation of publications. Figure 3 represents publications by country or territory. The CBRN innovations' most prominent publication activities were from the United States and China. India and European countries: Italy, the United Kingdom, the Netherlands, France, and Germany also achieved high records in publications activity. The subsequent analysis concerns the Scopus subject area (Table 1). Medicine (39), engineering (37), biochemistry, genetics, and molecular biology (28) were the most crucial subject areas. Medical journals cover emergency medicine, which applies to CBRN topics. Engineering might refer to civil, electrical, and mechanical engineering issues, so this term is broad and can cover many papers on innovations. Biochemistry, genetics, and molecular biology issues could be of high interest in cases of both health and environmental aspects. The final bibliometric analysis refers to document type (Table 2). Articles (68), reviews (39), conference papers (20), and book chapters (17) were the most popular publication types describing CBRN innovations. \begin{table}
\begin{tabular}{c c} \hline \hline
**Documents by Subject Area** & **Number** \\ \hline Medicine & 39 \\ Engineering & 37 \\ Biochemistry, Genetics, and Molecular Biology & 28 \\ Chemical Engineering & 17 \\ Materials Science & 16 \\ Agricultural and Biological Sciences & 14 \\ Energy & 14 \\ Pharmacology, Toxicology, and Pharmaceutics & 13 \\ Chemistry & 11 \\ Immunology and Microbiology & 7 \\ Computer Science & 6 \\ Earth and Planetary Sciences & 5 \\ Physics and Astronomy & 5 \\ Arts and Humanities & 4 \\ Health Professions & 4 \\ Decision Sciences & 3 \\ Multidisciplinary & 3 \\ Business, Management, and Accounting & 4 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Documents by subject area. Figure 3: Documents by country or territory. The next stage relied on processing the file with titles, abstracts, and keywords from 156 publications. It aimed to identify the most frequent portamateau words and clusters. The full counting method was applied, and the type of analysis was co-occurrence. The total link strengths correlate with higher occurrences. From the 2675 keywords, 77 met the threshold. Then, the selected portamateau words and clusters were manually selected (removing words that did not provide a clear answer concerning the crucial terms accompanying created innovations). They included \"male\", adult\", \"middle-aged\", and \"United States\". From the 77, the visualization will cover the 37 most common concepts gathered in four clusters. Figure 4 visualizes the retrieved most frequent portamateau words and clusters (marked in color) in the VOSViewer map. The interconnected mind map shows the regularities in the frequency of the terms and the correlations between them. There are four groups of clusters with two dominating: the most popular is \"health hazard\" (red), and the second is \"risk assessment\" (blue).