ULTRA and ULTRA-AS Ion-Implanted-Silicon Charged-Particle Detectors

ULTRA
• The new standard for charged-particle detector spectroscopy • Ultra-thin entrance contact for optimum energy resolution • High geometric efficiency due to close detector-to-can spacing • Rugged and reliable • Gold-plated cans for contacts that last a lifetime • Advanced surface passivation for total device stability • ORTEC quality and reliability • Bakeable at 200°C (require special order)
ULTRA-AS
• Low-background version for alpha spectroscopy
ULTRA ion-implanted-silicon detectors for alpha and beta spectroscopy are the most advanced charged-particle detectors ever produced. They possess the reliability that has ade ORTEC the sole supplier to NASA of silicon detectors for space applications.
Both the entrance and the back contact are ion implanted. The entrance contact is an extremely thin (~500 Å) boron implantation. Since no epoxies are used to mount the ULTRAs, the distance between the silicon surface and the top of the mounting can is <1 mm; this provides maximum geometric efficiency. The rugged front contact, easily cleaned with a solvent-moistened cotton swab, is impervious to finger contact.
ULTRA detectors have gold-plated mounting cans. The superior electrical conductivity of gold, which can never oxidize, makes it the choice vs. stainless steel or aluminum. Gold contacts last a lifetime. An advanced surface passivation that covers the critical silicon dioxide layer guarantees absolute device stability.
The extremely low leakage current permits specifying the energy resolution at a 1-µs amplifier time constant.
Low-background ULTRA-AS detectors are made with special low-background materials and have an optimized depletion thickness to minimize background counts from cosmic rays. All ORTEC Alpha Spectrometers (OCTÊTE Plus, 576A, and SOLOIST) are equipped with either ULTRA-AS detectors or R-Series, Ruggedized Surface Barrier Detectors. All these spectrometers, when equipped with a 450 mm2 detector, have a warranted background performance of £24 counts per day, over the 3- to 8-MeV energy range.
The dimensions of the ULTRA and ULTRA-AS detector mounting cans, identical to those of the corresponding size A or R Series detectors, ensure that ULTRA detectors will fit perfectly in any application where A or R Series detectors are being used now.
NOTE: Extensive care regarding detector and chamber cleanliness can result in background count levels as low as 0.05 counts/hr/cm2 of active area, corresponding to 6 counts/24 hours, for a 450 mm2 active area.
ULTRA and ULTRA-AS detectors are normally supplied in "B" mount, with a rear Microdot connector. Other mounting arrangements are available on request. (Example: For horizontal samples in Model 576A NIM Spectrometers, a closed-back "T" mount with side-mounted Microdot connector is needed. See note below ULTRA and ULTRA-AS tables.)
Dimensions and Mounting Arrangement

B Mount "Blind" T Mount

Detector Size (mm2) W (Nominal) Type B Rear Microdot "Blind" Type T** Transmission Mount X Y Z X Y Z 025 5.6 16.7 12.3 7.1 19.4 7.6 9.9 050 8.0 16.7 12.3 7.1 19.4 7.6 9.9 100 11.3 23.6 12.3 7.1 26.1 7.6 9.9 150 13.8 23.6 12.3 7.1 26.1 7.6 9.9 300 19.5 28.6 12.3 7.1 31.6 7.6 9.9 450 23.9 32.0 12.3 7.1 34.8 7.6 9.9 600 27.6 36.1 12.3 7.1 38.4 7.6 9.9 900 33.9 45.2 12.3 7.1       1200 40.0 48.8 12.3 7.1       2000 51.0 65.5 12.3 7.1       3000 62.0 76.2 12.3 7.1       Tolerances ±0.5 ±0.3 ±0.3 ±0.3 ±0.3 ±0.3 ±0.3 *W, X, Y, and Z dimensions given in millimeters **Built into a Microdot connector only

Ordering Information
 

ULTRA  Specify B or "Blind" T** Mount

Active Area (mm2)   Guaranteed Maximum Resolution* (keV FWHM) Minimum Depletion Depth 100 µm Model No.   Guaranteed Maximum Resolution* (keV FWHM) Minimum Depletion Depth 300 µm Model No.   Guaranteed Maximum Resolution* (keV FWHM) Minimum Depletion Depth 500 µm Model No. a b a b a b 25 12 14 6 8 U-012-025-100 U-014-025-100 11 13 5 7 U-011-025-300 U-013-025-300 11 12 4 6 U-011-025-500 U-012-025-500 50 12 14 6 8 U-012-050-100 U-014-050-100 11 13 5 7 U-011-050-300 U-013-050-300 11 13 5 7 U-011-050-500 U-013-050-500 100 13 15 7 9 U-013-100-100 U-015-100-100 12 14 6 8 U-012-100-300 U-014-100-300 12 14 6 8 U-012-100-500 U-014-100-500 150 14 16 9 10 U-014-150-100 U-016-150-100 13 15 8 9 U-013-150-300 U-015-150-300 12 14 7 9 U-012-150-500 U-014-150-500 300 16 19 11 14 U-016-300-100 U-019-300-100 15 18 10 13 U-015-300-300 U-018-300-300 14 17 9 12 U-014-300-500 U-017-300-500 450 17 21 12 16 U-017-450-100 U-021-450-100 16 20 11 15 U-016-450-300 U-020-450-300 15 19 10 14 U-015-450-500 U-019-450-500 600 22 24 17 19 U-022-600-100 U-024-600-100 21 23 16 18 U-021-600-300 U-023-600-300 20 22 15 17 U-020-600-500 U-022-600-500 900 27 33 22 28 U-027-900-100 U-033-900-100 25 30 20 25 U-025-900-300 U-030-900-300 23 28 18 23 U-023-900-500 U-028-900-500 1200 35 42 30 37 U-035-1200-100 U-042-1200-100 30 37 25 32 U-030-1200-300 U-047-1200-300 28 35 23 30 U-028-1200-500 U-035-1200-500 2000 50 58 45 53 U-050-2000-100 U-058-2000-100 40 48 35 43 U-040-2000-300 U-048-2000-300 35 43 30 38 U-035-2000-500 U-043-2000-500 3000 60 70 55 65 U-060-3000-100 U-070-3000-100 55 65 50 60 U-055-3000-300 U-065-3000-300 50 60 45 55 U-050-3000-500 U-060-3000-500

ULTRA-AS   Specify B or "Blind" T** Mount

~100 µm active depth to minimize cosmic background

Active Area (mm2) Alpha Resolution* (keV FWHM at 5.486 MeV) Model No. 300 19 U-019-300-AS 450 20 U-020-450-AS 600 24 U-024-600-AS 900 29 U-029-900-AS 1200 37 U-037-1200-AS

*First three digits of Model No. indicate total system resolution FWHM for 241Am, 5.486-MeV alphas, using standard ORTEC electronics and 1-µs shaping time constants.

**"Blind" T Mount available only for 300-, 450-, and 600-mm2, except by special order.

To Order:

Add the appropriate letter prefix for the mounting desired.

Example:  BU-016-300-100  or  TU-016-300-100**