ca |P | ( 3 . caer a l ; 7n1 R 27 a - 2 . =—ir—“i.C _ c oo m o Crt~t~wr—C‘C;sCU ; oS NDE67 o o . _ Lt : veoSp) lH | « C h ss7sOH 'ne3 —_— e e | ) h l U | Cfaea a : er1 ) h m i rm R601, 62 — . 8 C l || | cee v6.03 a eo i Jv F5A edc61 63 * 4&n7 22n : 602 : wa dd) eo[{mic] : SELECTED g o C654 i . Et-+ 0p
used photocathode materials, achieving high sensitiv- ity in the visible to near infrared region. In 1930, they succeeded in producing a phototube using this S-1 photocathode. In the same year, a Japanese scientist, Asao reported a method for enhancing the sensitivity of silver in the S-1 photocathode.
