New radiation-hard plastic scintillators

 Radiation-hard scintillators are used in places were considerable dose impact is achieved (nuclear power plants, radiation facilities etc.) or operation conditions make it impossible to change sensor elements frequently (space flight objects, large detectors for high energy physics). Fore these purposes we have developed the new radiation-hard scintillator UPS99RH.

 The main characteristics of radiation hardness, namely technical attenuation length (TAL) is presented in fig 1 for our new scintillator as well as for some nearest "competitors" The dependence of TAL after 10 MRad irradiation on dose rate is presented in fig. 1.

More detailed information on scintillator parameters could be found in table 1.

Table 1.

Name Light yield, ph.e. BAL length (before irradiation), cm TAL (before irradiation), cm TAL after 10 MRad dose irradiation
UPS99RH 3.0 70 70 20
BC408 3.8 370 170 12
SCSN-81 2.8 100 70 9
UPS923A (standard) 3.5 270 140 8

Standard scintillators

 

 Our new developments in the field of general-purpose scintillators are represented by standard scintillator UPS97GS. These scintillators are made by means of glass mold casting technique. Their main characteristics are summarized in the table 2.

Table 2.

Name BAL, cm TAL for 4mm plate, cm Operation time, years Light yield, % anthracene
UPS97GS 270 100 9.8 50
BC408 370 170 5.0 55-60
SCSN-81 100 80 8.4 45

 According to the whole set of indexes (operation time, light yield, transparency) our UPS97GS exceed its analogs (BC408 and SCSN-81). Besides, we can produce these devices with literally unlimited sizes.

Tissue-equivalent scintillators

 One of the primary goals of dosimetry is the determination of the absorbed dose in a human tissue exposed to radiation. This is why dose-equivalent systems of radiation protection (instead of the exposure measurements) were recommended by ICRP and now are implemented in most national standards. Our UPS2000TE satisfies most requirements of these standards. Especially it should be noted that its readouts are not changed with energy in 10 keV - 1.5 MeV region with accuracy of 25% (fig. 2).

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