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

ULTRA ultra.jpg (19492 bytes)
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
ultra_b_mount.jpg (15847 bytes)
B Mount
ultra_T_mount.jpg (17025 bytes)
"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**