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Detailed introductionApplication areas seen in alpha spectroscopy are radiochemistry, health physics and screening of environmental samples. Silicon radiation detectors for these applications are the ULTRA radiation detectors with depletion depth ≥100 microns and the ULTRA-AS radiation detectors with ultra-low background.
In addition, many facilities continue to use ruggedized (R-series) surface barrier radiation detectors that have low background and are opaque. The "SEE-NO-ALPHA" option provides guaranteed resolution specifications and lack of exposure to alpha sources prevents backscatter contamination.
*All resolution measurements performed and guaranteed at 21±1°C.
**Measured using 5.486-MeV natural alpha particles.
† ULTRA series detectors are manufactured using ion-implanted silicon dioxide passivation technology. Versions allowing baking at 200°C are available for special order.
| ULTRA† | ULTRA AS† | |
| Main applications | High-resolution, high-efficiency alpha and beta spectrum measurements | High-efficiency alpha spectroscopy measurement with ultra-low background |
| Main features/Advantages |
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| starting materials | Si | Si |
| Effective area range (mm2) | 25-3000 | 300–1200 |
| Effective thickness range (µm) | 100-500 | 100 |
| Guaranteed operating temperature range* | +50°C to | +50°C to |
| diode structure | Inject boron - NtypeSiinjected as partially depleted | Inject boron - NtypeSiinjected as partially depleted |
| Nominal equivalent ** window cutoff energy | incident | incident |
