ORTEC kiseldetektorer för alfaspektrometri

Silicon detectors for alpha spectrometry

Silicon charged-particle detectors for alpha spectrometry, from low-background ion-implanted models to ruggedized surface-barrier detectors.

Detector type: ULTRA/ULTRA-AS: ion-implanted silicon; R: ruggedized silicon surface barrier1
Depletion depth: ULTRA and R: minimum 100/300/500 µm depending on model; ULTRA-AS: approximately 100 µm2
Energy resolution, example model: BU-020-450-AS: ≤20 keV FWHM at 5.486 MeV (²⁴¹Am), ORTEC electronics, 1 µs shaping; measured and warranted at 21 ±1 °C2

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

Key features

ULTRA and ULTRA-AS for alpha spectroscopy; ULTRA-AS uses low-background materials.
R Series can operate in vacuum or air with ambient light.
Alpha Suite: B-mount ULTRA-AS and low-background R are guaranteed compatible; other configurations require factory approval.

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	ULTRA/ULTRA-AS: ion-implanted silicon; R: ruggedized silicon surface barrier1
Active detector area	ULTRA: 25–3000 mm²; R: 50–2000 mm²; example BU-020-450-AS: 450 mm²1
Depletion depth	ULTRA and R: minimum 100/300/500 µm depending on model; ULTRA-AS: approximately 100 µm2
Energy resolution, example model	BU-020-450-AS: ≤20 keV FWHM at 5.486 MeV (²⁴¹Am), ORTEC electronics, 1 µs shaping; measured and warranted at 21 ±1 °C2
Bias polarity	ULTRA/ULTRA-AS: positive; R: negative2
Mounts/connections	B: rear Microdot; C: rear BNC; T: side Microdot, ULTRA/AS up to 600 mm²2
Alpha Suite compatibility	Guaranteed: B-mount ULTRA-AS and low-background R; others require approved special configuration2
Measurement environment	R Series: vacuum or air with ambient light3

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

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 Introduction and table footnote †; Table 'Range of Active Area'; R range from R Series ordering tables (S33); example from ULTRA-AS table (S32) Checked 2026-10-16
2
ULTRA and ULTRA-AS Ion Implanted Silicon Charged Particle Radiation Detectors
Publisher: ORTEC (AMETEK)Product page Ordering Information for ULTRA (tables) and ULTRA-AS; Ordering Information for ULTRA-AS; overview footnote (S31); More Information, footnote **; Mounting Arrangements … Checked 2026-10-16
3
R Series Ruggedized Partially Depleted Silicon Radiation Detector
Publisher: ORTEC (AMETEK)Product page Main Application Checked 2026-10-16