H8259シリーズは、φ28 mm (1-1/8")サイドオン型光電子増倍管と高速フォトンカウンティング回路、高圧電源回路を内蔵したフォトンカウンティングヘッドです。近赤外域に感度のある光電子増倍管は、熱雑音によるダークカウントが大きくなりますが、低ノイズの光電子増倍管を選別しているため、高SNの測定が可能です。光電子増倍管の高電圧やディスクリミネータの設定はすでに調整してありますので、+5 Vを入力するだけでフォトンカウンティング計測が行えます。 また、電子ゲート回路（シャッタ回路）が付加されているため、励起光など測定対象以外の光を設定した時間だけ遮ることが可能です。
|受光面サイズ||4 x 20 mm|
|感度波長 (Short)||185 nm|
|感度波長 (Long)||680 nm|
|感度波長 (Peak)||400 nm|
|外形寸法 (W x H x D)||38.0 x 95.0 x 50.0 mm|
|計数感度 at 300 nm Typ.||2.1 x 105 s-1・pW-1|
|計数感度 at 400 nm Typ.||2.6 x 105 s-1・pW-1|
|計数感度 at 500 nm Typ.||1.9 x 105 s-1・pW-1|
|計数感度 at 600 nm Typ.||7.5 x 104 s-1・pW-1|
|計数感度 at 700 nm Typ.||1.5 x 103 s-1・pW-1|
|カウントリニアリティ||2.5 x 106 s-1|
|ダークカウント Typ.||30 s-1|
|ダークカウント Max.||80 s-1|
|出力パルス波高 Min.||2 V|
|出力パルス波高 Typ.||2.2 V|
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