Solar Blind Phototubes

FIGURE 6-12. Spectral sensitivities of the R106 and R166 photomultiplier tubes. [From A. Walsh, Physical Aspects of Atomic Absorption, ASTM-STP 433 (1968). Used by permission of the American Society for Testing Materials.] 

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Phototubes with restricted spectral response curves frequently are referred to as solar blind phototubes. Typical of such tubes is the Hamamatsu R166, which has a sensitivity curve as shown in Figure 6-12, where its spectral response may be compared with the spectral response curve of the R106 (S-5) phototube. It is apparent that the R166 has little response at... 

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