Editing Final Report/Thesis 2016 (section)

==== Element classification ====
Some recorded hair data contains toxic and heavy mental elements which are harmful for human health in high values. However, most are essential elements for human body. Table 2 shows the toxic elements and essential elements in hair. The comparison of toxic elements content in hair is an important research subject.[21]
Table 2 the Different Type Elements of Hair
[[File:somertontable2.png|center|Table 2 the Different Type Elements of Hair]]
In previous study, the hair data analysis is based on glass test result. However, the impurity material has influence on element values, thus, the data analysis mainly relies on quartz test rather than glass test in this project. Compared with glass plate, the quartz plate is a purity material composition. Table 3 shows the main composition of glass and quartz.
Table 3 The different Elements of Glass and Quartz
[[File:somertontable3.png|center|Table 3 The different Elements of Glass and Quartz]]