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| − | == First Test Idaho bar ==
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| − | Two lead glass bars of <math>34x4.3x4.3 cm^3</math> were borrowed for our study. One of them, ID06, was measured and then bleached in several sessions. The first measurement, without any UV session, shows non-uniformity of the damage along the bar. Fig 3, shows the transmission transversal to the bar at different positions for six different wavelengths.
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| − | [[Image:ID06-T-0h TvsD.png|200px|thumb|left|Fig. 3 ID06 bar measured transversally for 6 different wavelengths]][[Image:ID06-T-7h TvsD.png|310px|thumb|none|Fig. 4 ID06 bar measured transversally for 6 different wavelengths after 7 UV session of 1 h each]]
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| − | This bar has been bleached in 7 UV sessions of 1h each session. The results are presented in the Fig. 4. It is possible that some dirty or misplacement during the measurement cause the misplaced point. Due to the inhomogeneities of the bar no good conclusion could be extracted about the cleaning process. Anyhow, since the bar was irradiated completely, it can be deduced the reach of UV light. Obviously the reach of UV light depends strongly of how transparent is the portion before. The plots show that certain quantity of UV light could reach 20-25 cm depth after just one hour session. Naturally, the efficiency of deeper cleaner is reduced due to the absorption of the light in the material, i.e. intensity of the light is reduced.
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