ORTEC ULTRA

Ion-implanted silicon detectors for alpha spectroscopy

ORTEC ULTRA comprises 66 models (ion-implanted silicon detectors for alpha spectroscopy). The models differ in active area, depletion depth and warranted resolution, among other things – compare them in the model table.

Detector type: Ion-implanted silicon, partially depleted1

Download product sheet (PDF)All values with references – for tender documents

Specifications checked against the manufacturer’s documents on 2026-10-16

Manufacturer’s product page (opens in a new tab)

Overview

Nuclear power & nuclear technology Research & laboratories Environmental monitoring & radiation protection

Specifications

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

Detector type	Ion-implanted silicon, partially depleted1
Resolution measurement conditions	²⁴¹Am 5.486 MeV alphas; standard ORTEC electronics; 1 µs shaping time constants2
Resolution measurement and warranty temperature	21 ±1 °C1
Bias polarity	Positive2
Alpha Suite compatibility	Requires an approved special for Alpha Suite compatibility and warranted system specifications3
Resolution reference geometry	Thin-window point source; distance at least 2 times the detector diameter4

The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.

Models

66 models in the series. Filter or scroll the table to compare.

66 / 66

Model	Minimum active area3	Minimum depletion depth3	Guaranteed maximum alpha resolution3	Ordering mounts3
U-011-025-300	≥25 mm²	≥300 µm	≤11 keV FWHM	B, C, T (closed back)
U-011-025-500	≥25 mm²	≥500 µm	≤11 keV FWHM	B, C, T (closed back)
U-011-050-300	≥50 mm²	≥300 µm	≤11 keV FWHM	B, C, T (closed back)
U-011-050-500	≥50 mm²	≥500 µm	≤11 keV FWHM	B, C, T (closed back)
U-012-025-100	≥25 mm²	≥100 µm	≤12 keV FWHM	B, C, T (closed back)
U-012-025-500	≥25 mm²	≥500 µm	≤12 keV FWHM	B, C, T (closed back)
U-012-050-100	≥50 mm²	≥100 µm	≤12 keV FWHM	B, C, T (closed back)
U-012-100-300	≥100 mm²	≥300 µm	≤12 keV FWHM	B, C, T (closed back)
U-012-100-500	≥100 mm²	≥500 µm	≤12 keV FWHM	B, C, T (closed back)
U-012-150-500	≥150 mm²	≥500 µm	≤12 keV FWHM	B, C, T (closed back)
U-013-025-300	≥25 mm²	≥300 µm	≤13 keV FWHM	B, C, T (closed back)
U-013-050-300	≥50 mm²	≥300 µm	≤13 keV FWHM	B, C, T (closed back)
U-013-050-500	≥50 mm²	≥500 µm	≤13 keV FWHM	B, C, T (closed back)
U-013-100-100	≥100 mm²	≥100 µm	≤13 keV FWHM	B, C, T (closed back)
U-013-150-300	≥150 mm²	≥300 µm	≤13 keV FWHM	B, C, T (closed back)
U-014-025-100	≥25 mm²	≥100 µm	≤14 keV FWHM	B, C, T (closed back)
U-014-050-100	≥50 mm²	≥100 µm	≤14 keV FWHM	B, C, T (closed back)
U-014-100-300	≥100 mm²	≥300 µm	≤14 keV FWHM	B, C, T (closed back)
U-014-100-500	≥100 mm²	≥500 µm	≤14 keV FWHM	B, C, T (closed back)
U-014-150-100	≥150 mm²	≥100 µm	≤14 keV FWHM	B, C, T (closed back)
U-014-150-500	≥150 mm²	≥500 µm	≤14 keV FWHM	B, C, T (closed back)
U-014-300-500	≥300 mm²	≥500 µm	≤14 keV FWHM	B, C, T (closed back)
U-015-100-100	≥100 mm²	≥100 µm	≤15 keV FWHM	B, C, T (closed back)
U-015-150-300	≥150 mm²	≥300 µm	≤15 keV FWHM	B, C, T (closed back)
U-015-300-300	≥300 mm²	≥300 µm	≤15 keV FWHM	B, C, T (closed back)
U-015-450-500	≥450 mm²	≥500 µm	≤15 keV FWHM	B, C, T (closed back)
U-016-150-100	≥150 mm²	≥100 µm	≤16 keV FWHM	B, C, T (closed back)
U-016-300-100	≥300 mm²	≥100 µm	≤16 keV FWHM	B, C, T (closed back)
U-016-450-300	≥450 mm²	≥300 µm	≤16 keV FWHM	B, C, T (closed back)
U-017-300-500	≥300 mm²	≥500 µm	≤17 keV FWHM	B, C, T (closed back)
U-017-450-100	≥450 mm²	≥100 µm	≤17 keV FWHM	B, C, T (closed back)
U-018-300-300	≥300 mm²	≥300 µm	≤18 keV FWHM	B, C, T (closed back)
U-019-300-100	≥300 mm²	≥100 µm	≤19 keV FWHM	B, C, T (closed back)
U-019-450-500	≥450 mm²	≥500 µm	≤19 keV FWHM	B, C, T (closed back)
U-020-450-300	≥450 mm²	≥300 µm	≤20 keV FWHM	B, C, T (closed back)
U-020-600-500	≥600 mm²	≥500 µm	≤20 keV FWHM	B, C, T (closed back)
U-021-450-100	≥450 mm²	≥100 µm	≤21 keV FWHM	B, C, T (closed back)
U-021-600-300	≥600 mm²	≥300 µm	≤21 keV FWHM	B, C, T (closed back)
U-022-600-100	≥600 mm²	≥100 µm	≤22 keV FWHM	B, C, T (closed back)
U-022-600-500	≥600 mm²	≥500 µm	≤22 keV FWHM	B, C, T (closed back)
U-023-600-300	≥600 mm²	≥300 µm	≤23 keV FWHM	B, C, T (closed back)
U-023-900-500	≥900 mm²	≥500 µm	≤23 keV FWHM	B, C
U-024-600-100	≥600 mm²	≥100 µm	≤24 keV FWHM	B, C, T (closed back)
U-025-900-300	≥900 mm²	≥300 µm	≤25 keV FWHM	B, C
U-027-900-100	≥900 mm²	≥100 µm	≤27 keV FWHM	B, C
U-028-900-500	≥900 mm²	≥500 µm	≤28 keV FWHM	B, C
U-028-1200-500	≥1200 mm²	≥500 µm	≤28 keV FWHM	B, C
U-030-900-300	≥900 mm²	≥300 µm	≤30 keV FWHM	B, C
U-030-1200-300	≥1200 mm²	≥300 µm	≤30 keV FWHM	B, C
U-033-900-100	≥900 mm²	≥100 µm	≤33 keV FWHM	B, C
U-035-1200-100	≥1200 mm²	≥100 µm	≤35 keV FWHM	B, C
U-035-1200-500	≥1200 mm²	≥500 µm	≤35 keV FWHM	B, C
U-035-2000-500	≥2000 mm²	≥500 µm	≤35 keV FWHM	B, C
U-037-1200-300	≥1200 mm²	≥300 µm	≤37 keV FWHM	B, C
U-040-2000-300	≥2000 mm²	≥300 µm	≤40 keV FWHM	B, C
U-042-1200-100	≥1200 mm²	≥100 µm	≤42 keV FWHM	B, C
U-043-2000-500	≥2000 mm²	≥500 µm	≤43 keV FWHM	B, C
U-048-2000-300	≥2000 mm²	≥300 µm	≤48 keV FWHM	B, C
U-050-2000-100	≥2000 mm²	≥100 µm	≤50 keV FWHM	B, C
U-050-3000-500	≥3000 mm²	≥500 µm	≤50 keV FWHM	B, C
U-055-3000-300	≥3000 mm²	≥300 µm	≤55 keV FWHM	B, C
U-058-2000-100	≥2000 mm²	≥100 µm	≤58 keV FWHM	B, C
U-060-3000-100	≥3000 mm²	≥100 µm	≤60 keV FWHM	B, C
U-060-3000-500	≥3000 mm²	≥500 µm	≤60 keV FWHM	B, C
U-065-3000-300	≥3000 mm²	≥300 µm	≤65 keV FWHM	B, C
U-070-3000-100	≥3000 mm²	≥100 µm	≤70 keV FWHM	B, C

Documents

PDFULTRA and ULTRA AS Ion-Implanted-Silicon Charged-Particle DetectorsDatasheet · ORTEC

Sources

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

1
Si Charged Particle Radiation Detectors for Alpha Spectroscopy
Publisher: ORTEC (AMETEK)Product page ULTRA / ULTRA AS comparison table ('Diode Structure') and footnote †; footnote * below the introduction text Checked 2026-10-16
2
ULTRA and ULTRA AS Ion-Implanted-Silicon Charged-Particle Detectors
Publisher: ORTEC (AMETEK)Brochure p. 2–3, footnote * under the ULTRA / ULTRA-AS ordering tables; p. 1, footnote ** Checked 2026-10-16
3
ORTEC Product Guide
Publisher: ORTEC (AMETEK)Product catalogue PDF p. 11 (printed p. 8), 'Ordering Information' note; PDF p. 4 (printed p. 1), table 'ULTRA Ion-Implanted Detectors', Active Area column; PDF p. 11: 'The next group of digits; PDF p. 4 (printed p. 1), table 'ULTRA Ion-Implanted Detectors', column 'Minimum Depletion Depth 300 μm'; PDF p. 4 (printed p. 1), table 'ULTRA Ion-Implanted Detectors', depth column 300 μm … Checked 2026-10-16
4
Introduction to Charged-Particle Detectors
Publisher: ORTEC (AMETEK)Application note PDF p. 3, 'Energy Resolution and Noise' Checked 2026-10-16