SCIONIX scintillation detectors are characterized by a type number in which most of the properties of the instrument can be found. However, there remain features that are not “captured” in the type number (e.g. special geometries or electronic features) since there is a large number of ways a scintillation detector can be constructed. In this case the suffix -X is added to the type number which refers to “special”. Note that for some of the nine features below, more than one option may apply.
The following example, type number V 50 ED 5 / 2 ME1 – C – X indicates a 50 mm square CsI(Tl) crystal, 5 mm high, integrally coupled to a 51 mm diameter (2″) photomultiplier tube, provided with a beryllium entrance window, solid Mu-metal detector housing and built-in voltage divider. It is a customer special. Standard “off the shelf” scintillation detectors are provided with silver anodized aluminum housings, bialkali photocathode PMTs and positive (+) high voltage operation.
V 50 B D 5 / 2 – ME1 – C – X
1. Geometry of scintillator
2. Actual scintillation diameter in mm
3. Type of crystal / light detector coupling
Integrally mounted photomultiplier
Crystal without photomultiplier
High temperature detector
Crystal readout side perpendicular to PMT
Quartz light guide or window
Undoped NaI light guide
4. Type of window / housing
Thin window aluminum entrance window
Beryllium entrance window
Mylar entrance window
Steel housing (chrome plated or stainless)
Axial well in crystal
Standard 0.5 mm thick aluminum housing
5. Height of crystal in mm
In case of phoswiches, the height of the primary crystal precedes the letters PH followed by the height of the secondary (guard) crystal.
6. Diameter of photomultiplier tube in inches
In case of more than one PMT, the number is indicated in brackets after the diameter; e.g. / 3(3) indicates three 76 mm PMTs. In case of photodiode readout, the size of the photodiode is indicated in mm.
7. Electronics/ features of PMT
External solid m-metal shield
Version with flying PMT leads
Built-in Voltage Divider (VD)
Voltage divider / preamplifier
Customer electronics special
Built-in high voltage generator
Negative high voltage
8. Scintillation Material