IAS-TW10 Tritium Surface Contamination Wipe Monitor — No P-10 Gas

What the IAS-TW10 does

Tritium surface contamination cannot be found with a standard frisker, because tritium beta particles (maximum 18.6 keV) do not get through a detector window. The usual method is a wipe (smear) counted by liquid scintillation, which means cocktail, vials, a lab counter and a wait.

The IAS-TW10 gives a field result in under 2 minutes and does not use P-10 counting gas, so there are no gas bottles to carry or change. It measures a 100 cm² wipe, which is the same area as the US dpm/100 cm² convention. Readings are shown in kDPM/dm² (1 kDPM/dm² = 1,000 dpm/100 cm²), nCi/dm² or Bq/cm², with an alarm level that can be set anywhere in the range.

Key features

• No P-10 (argon-methane) counting gas required
• Result in under 2 minutes
• 100 cm² measurement area, matching the dpm/100 cm² convention
• Units: kDPM/dm², nCi/dm², Bq/cm²
• Alarm level settable across the full range
• LCD touchscreen
• Portable: under 2.7 kg (6.0 lb)

IAS-TW10 specifications

Specifications are nominal manufacturer values and may change. Confirmed values are stated on the quotation and data sheet. DAC multiples use the tritiated-water DAC of 2 × 10⁻⁵ µCi/mL (7.4 × 10⁵ Bq/m³) from 10 CFR 20 Appendix B and 10 CFR 835 Appendix A.

Typical applications

• Screening tools and equipment leaving tritium areas (confirm near limits by LSC)
• Triage surveys after spills or suspected high-level contamination
• Glovebox port and bag-out surface checks
• Tritium light and luminous-sign manufacturing lines
• Decommissioning and waste-packaging surveys

US supply, documentation and quality

Iodine Air Systems supplies the IAS-T series as an authorized distributor. Instruments are built by our manufacturing partner to our US configuration. Each quotation states the exact deliverables, lead time and country of origin.

• US power version: 120 V AC / 60 Hz for mains-powered models (export versions for 220–230 V / 50 Hz).
• Factory calibration certificate with every instrument, stating the calibration method and reference standards.
• Certificate of conformance and product certification documents supplied with the quotation.
• Specifications in SI and US units, with ranges stated in µCi/mL and in multiples of the tritium DAC (10 CFR 20 Appendix B / 10 CFR 835 Appendix A), so they drop straight into your procedures.
• Commercial-grade supply. Instruments are supplied as commercial-grade items, not as 10 CFR 50 Appendix B / NQA-1 safety-related items. For safety-related use, we support the purchaser's commercial-grade dedication with critical-characteristic data and test records.
• Price on quotation. Price depends on model, options, quantity, documentation package and destination.

Compare with related IAS-T models

See the full IAS-T tritium monitor range or use the tritium DAC converter to check a reading against your limits.

IAS-TW10 FAQ

Related pages

• How to choose a tritium monitor
• Tritium monitoring for fusion facilities
• Tritium DAC and unit converter (Bq/m³ ↔ µCi/mL)
• Tritium monitor selection guide (PDF)
• Nuclear-grade radioiodine carbon and consumables
• Cyclohexane methyl-iodide alternative test system
• Methyl iodide carbon testing service
• Nuclear air filtration systems
• Nuclear decommissioning air filtration

Sources

• 10 CFR Part 20 Appendix B: ALIs, DACs and effluent concentrations (eCFR)
• 10 CFR Part 835 Appendix A: DACs for DOE facilities (eCFR)
• ANSI N42.30, Performance Specification for Tritium Monitors (IEEE Xplore)
• IEC 62303: Equipment for monitoring airborne tritium (ANSI Webstore)