NewOpto RD Series Silicon Radiation Detectors

Overview

The NewOpto RD Series comprises a family of silicon-based PIN photodiode radiation detectors engineered for precise detection and quantification of low-energy ionizing radiation—including soft X-rays, gamma photons, and charged particles—in laboratory and industrial measurement environments. These detectors operate on the principle of charge carrier generation via photoelectric absorption and electron-hole pair creation in fully depleted silicon bulk material. Their high atomic number (Z = 14) and optimized depletion depth enable efficient stopping power for photons in the 0.1–20 keV range, while ultra-low dark current (<5 nA, down to 5 pA in selected variants) ensures exceptional signal-to-noise ratio at low count rates and sub-keV energy thresholds. Designed for integration into spectroscopic, dosimetric, and beam-monitoring systems, the RD Series complies with fundamental requirements for radiation detection in physics education labs, nuclear instrumentation calibration setups, and synchrotron beamline diagnostics.

Key Features

• Fully depleted silicon active layer (300–500 µm thickness) enabling high quantum efficiency across soft X-ray and low-energy gamma bands
• Ultra-low dark current (as low as 0.005 nA at –5 V bias), minimizing thermal noise and supporting high-sensitivity pulse-height analysis
• Multiple active area options—from Ø0.8 mm (0.5 mm²) to 10 × 10 mm (100 mm²)—to balance spatial resolution, detection efficiency, and capacitance-limited bandwidth
• Hermetically sealed packages including TO-8S, TO-39, LCC10, and ceramic-pin (CerPin) variants for stable long-term operation under vacuum or controlled-atmosphere conditions
• Standard reverse-bias compatibility (–5 V to –100 V), allowing flexible optimization of charge collection speed and spectral linearity
• No internal amplification—designed for external low-noise charge-sensitive preamplifiers (e.g., ORTEC 142A, Cremat CR-110), preserving pulse shape fidelity for energy-resolved applications

Sample Compatibility & Compliance

The RD Series is compatible with standard radiation sources used in academic and metrology laboratories—including ⁵⁵Fe (5.9 keV Mn Kα), ²⁴¹Am (59.5 keV), and ¹⁰⁹Cd (22.1 keV)—and supports quantitative measurements traceable to NIST SRM standards when paired with calibrated preamplifier/digitizer chains. All detectors meet RoHS Directive 2011/65/EU and are manufactured in accordance with ISO 9001-certified processes. While not certified for medical or safety-critical use per IEC 61508 or IEC 62304, the devices conform to general-purpose radiation detection guidelines outlined in ASTM E1733-18 (Standard Guide for Use of Detectors in Radiological Measurements) and support GLP-compliant data acquisition workflows when integrated with audit-trail-enabled software platforms.

Software & Data Management

These detectors do not include embedded firmware or onboard processing; they interface exclusively via analog output (current pulse or integrated charge) to external spectroscopy systems. Compatible data acquisition ecosystems include ORTEC’s Maestro-32, Amptek’s DPPMCA, and open-source frameworks such as PyMCA and SpecTcl. When deployed in regulated environments, users may implement 21 CFR Part 11-compliant electronic signatures and audit trails through validated third-party DAQ software—provided hardware-level timestamping and raw waveform logging are preserved. Detector calibration files (energy-channel mapping, gain/offset, FWHM vs. energy) are typically stored in standard .cal or .mca formats and can be imported into MATLAB, Python (NumPy/SciPy), or LabVIEW for advanced spectral deconvolution and background subtraction.

Applications

• X-ray fluorescence (XRF) elemental analysis in benchtop micro-XRF systems
• Low-energy gamma spectroscopy for environmental radionuclide screening (e.g., ²¹⁰Pb, ²⁴¹Am)
• Beam intensity monitoring and position sensing in synchrotron and plasma diagnostic setups
• Educational experiments in nuclear physics labs—including Compton scattering verification and half-life determination
• Particle-induced X-ray emission (PIXE) detection in ion beam analysis facilities
• Integration into compact radiation survey meters and handheld spectrometers requiring high-resolution, low-power solid-state detection

FAQ

What radiation types can the RD Series detect?
It detects ionizing photons (X-rays and low-energy gamma rays) and charged particles (e.g., alpha, beta) incident on the silicon surface—provided their energy exceeds the detector’s effective threshold (~1 keV for thin-window variants).

Is cooling required for optimal performance?
Thermoelectric (Peltier) cooling is optional but recommended for extended counting periods (>1 hr) or sub-100 eV energy resolution goals; uncooled operation is suitable for routine qualitative surveys and count-rate applications.

Can these detectors be used in vacuum environments?
Yes—TO-8S, TO-39, and CerPin packages are vacuum-compatible and rated for pressures down to 10⁻⁷ mbar; LCC10 requires evaluation of epoxy outgassing in ultra-high vacuum contexts.

Do you provide calibration certificates?
Calibration is system-level and application-specific; NewOpto supplies typified responsivity curves and dark current specifications per batch. Full NIST-traceable calibration must be performed by end-users or accredited metrology labs using reference sources.

What is the maximum count rate before pulse pile-up becomes significant?
Depends on preamplifier shaping time and detector capacitance; typical upper limits range from 5 kcps (for 100 mm² LCC10 with 1 µs shaping) to >100 kcps (for Ø0.8 mm TO-8S with fast CR-RC filtering).