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Zinc Selenide ZnSe(Te) scintillation material was created especially for matching with photodiode, which its emission maximum is at 640 nm. Matching coefficient between scintillator and photodiode is up to 0.9. ZnSe scintillators are sharply different from ZnS. "Fast" ZnSe has the time decay of 3 - 5 µs, "slow" - 30 - 50 µs. These are used preferably for X-rays and gamma-particle registration.
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ZnSe(Te) |
Melting temperature , К |
1793 |
Density, г/см3 |
5,42 |
Эффективный атомный номер Zсц |
33 |
Hygroscopic |
no |
lmax, nm |
640 |
Коэффициент преобразования энергии hсц, % |
19-22 |
Уровень послесвечения
через 6 мс, % |
< 0,05 |
Поглощение собственного излучения, см-1 |
0,2 |
Световой выход с ФД относительно CsI(Tl) при толщине 2 мм, % |
до 170 |
Decay time , 10-3s |
10-40 |
Refraction coefficient |
2,59 |
Абсолютный световыход Фот/MэВ×g |
~6×104 |
Relative to CsI(Tl), light output for X-rays with E<100 keV (CsI(Tl)=100%) is up to 170% at 2 mm thickness. Non-uniformity is usually less than 1%. Crystals ZnSe(Te) are non-higroscopic and good enough for mechanical treatment without any cleavage. Maximal diameter is 50mm.
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