Collecting electrode: Temperature Range -20°C to +80°C

Component Specifications

Definition

A collecting electrode is a critical component within an individual ionization chamber designed to attract and accumulate charged particles (ions or electrons) generated by ionizing radiation. It functions as the charge collection terminal, converting radiation-induced ionization into measurable electrical signals through precise electrostatic field control. This electrode maintains stable potential differences relative to other chamber elements to ensure efficient charge collection without recombination losses.

Working Principle

The collecting electrode operates on electrostatic attraction principles within an ionization chamber. When ionizing radiation interacts with the chamber's fill gas, it creates positive ions and free electrons. The electrode, maintained at a specific electrical potential (typically ground or biased voltage), attracts oppositely charged particles through the applied electric field. Collected charges generate a current proportional to radiation intensity, which is amplified and measured by associated electronics. The electrode's geometry and surface finish minimize field distortions and secondary electron emissions.

Materials

High-purity metals with low work function and excellent conductivity: Stainless steel (AISI 304/316), aluminum alloys (6061-T6), copper (OFHC), or gold-plated surfaces. Materials selected for radiation hardness, low outgassing, and corrosion resistance. Insulation typically uses ceramic (alumina) or high-performance polymers (PTFE, PEEK).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	10-50 mm
Thickness	0.5-3 mm
Capacitance	5-50 pF
Operating Voltage	±50-500 V DC
Surface Roughness	< 0.8 μm Ra
Temperature Range	-20°C to +80°C
Vacuum Compatibility	Up to 10^-6 mbar
Electrical Resistance	< 0.1 Ω

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 4037, ISO 8529, DIN 6814, IEC 60731

Parent Products

This component is used in the following industrial products

Individual ionization chamber

A single gas-filled detector unit that measures ionizing radiation by collecting the charge produced when radiation interacts with the gas.

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Engineering Analysis

Risks & Mitigation

Electrical arcing at high voltages
Surface contamination affecting charge collection
Mechanical deformation altering electric fields
Corrosion in humid environments
Insulation breakdown

FMEA Triads

Trigger: Surface contamination from particulates or oils
Failure: Reduced charge collection efficiency, signal drift
Mitigation: Implement cleanroom handling procedures, regular ultrasonic cleaning with appropriate solvents

Trigger: Improper voltage biasing
Failure: Incomplete charge collection, recombination losses
Mitigation: Use regulated high-voltage supplies with overvoltage protection, implement voltage monitoring

Trigger: Mechanical stress during installation
Failure: Electrode deformation, altered electric field geometry
Mitigation: Follow torque specifications during assembly, use alignment fixtures, avoid excessive handling

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm dimensional tolerance, ±5% electrical resistance tolerance, surface flatness within 0.05 mm

Test Method

Electrical continuity testing, insulation resistance measurement (>10^12 Ω), dimensional verification with coordinate measuring machine, radiation response calibration using reference sources

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

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Manufacturers of Collecting electrode

Manufacturer profiles associated with Collecting electrode.

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Frequently Asked Questions

What is the primary function of a collecting electrode in an ionization chamber?

The collecting electrode captures charged particles (ions/electrons) created by ionizing radiation, converting them into measurable electrical signals for radiation dose or intensity measurement.

How does electrode material affect ionization chamber performance?

Material choice impacts conductivity, radiation hardness, outgassing, and secondary electron emission. High-purity metals with low work functions ensure efficient charge collection and minimal signal distortion.

What maintenance do collecting electrodes require?

Regular cleaning to remove contamination, periodic electrical testing for insulation resistance, and inspection for physical damage or corrosion. Calibration verification against radiation standards is essential.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Collecting electrode