Expert-authored technical articles on nuclear air filtration, hospital infectious aerosol control, I-131 ventilation, carbon filter maintenance, HEPA testing, decommissioning, and industrial air purification. Written for health physicists, facility engineers, RSOs, and procurement professionals.
ACH targets by work type (4–15+ ACH), CFM formula, 6 worked examples (hot cell to 7,200 ft³), IAS-NC700-HI vs NC500 selection, multi-zone coverage, ALARA NRC compliance. Interactive calculator.
NRC 10 CFR 50 Subpart D, ALARA, 12 radiological contaminants (Cs-137, Co-60, alpha emitters), DECON vs SAFSTOR, portable cart sizing, IAS-NC700-HI and NC500 field deployment.
HEPA replace at ΔP ≥1.0 in.WG or >0.03% in-place test. Carbon: >0.175% CH₃I or 5-year limit or >80°C. 6-step change-out procedure, printable maintenance log, Google Scholar references.
Side-by-side: ASHRAE 170 = mechanical ACH by room type (OR 20 ACH, ICU 6 ACH, AII 12 ACH negative). ASHRAE 241 = total ECA including air cleaning. Both apply simultaneously. Room table, decision tool.
ACH targets by work type (4–15+ ACH), CFM formula, 6 worked examples (hot cell to 7,200 ft³), IAS-NC700-HI vs NC500 selection, multi-zone coverage, ALARA NRC compliance. Interactive calculator.
NRC 10 CFR 50 Subpart D, ALARA, 12 radiological contaminants (Cs-137, Co-60, alpha emitters), DECON vs SAFSTOR, portable cart sizing, IAS-NC700-HI and NC500 field deployment.
HEPA replace at ΔP ≥1.0 in.WG or >0.03% in-place test. Carbon: >0.175% CH₃I or 5-year limit or >80°C. 6-step change-out procedure, printable maintenance log, Google Scholar references.
Why DOP (IARC 2B carcinogen) was replaced by PAO (Emery 3004). Test methodology, ≤0.03% penetration acceptance, photometer vs OPC, 7-step procedure, NRC RG 1.52 annual requirements.
Physical t½=8.02 days, effective 7.28 days, λ=0.08664/day. Decay table 0–80 days, DAC 2×10⁻⁸ µCi/mL, thyroid dose 5.1×10⁻⁸ Sv/Bq, NRC 10 CFR 35.75. Interactive decay calculator.
DIN 3754 cyclohexane (non-radioactive, 20°C/50% RH) vs ANSI N509/N510 methyl iodide (30°C/70% RH). NRC regulatory status, TEDA SN2 mechanism, acceptance criteria ≤0.175% CH₃I.
Full TDS: viscosity 1,300–1,400 cP, coverage 0.6–2.5 m²/L, film ≤2 hrs, peel ≤8 hrs, tensile ≥2.0 MPa ASTM D412. 6-step application, vs chemical spray/water jet comparison. ALARA benefit.
Side-by-side: ASHRAE 170 = mechanical ACH by room type (OR 20 ACH, ICU 6 ACH, AII 12 ACH negative). ASHRAE 241 = total ECA including air cleaning. Both apply simultaneously. Room table, decision tool.
ASHRAE 241-2023 ECA formula, IRMM requirements (5 ACH min), surgical suites (15–20 ACH), ICU (7–10 ACH), isolation rooms (12 ACH). ECA calculation worked example. Technology comparison.
NRC 10 CFR 35.75, negative pressure ≥0.01 in.WG, 6–12 ACH, HEPA + TEDA carbon filtration. Three-stage filter train, monitoring, case study: 750-bed medical center. ASHRAE 241 ECA contribution.
Dual-chamber 304 SS iodine absorption: 24-in × 36-in chambers, TEDA or silver silicate media, NOx removal >95%, GC-MS/FTIR sampling ports, variable flow kinetics, research configurations.
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IAS engineers publish new technical guides regularly. Contact us with your specific application question — ECA calculations, filter sizing, NRC compliance, carbon qualification, I-131 ventilation — and we'll provide a direct engineering response.
The following links connect to peer-reviewed academic papers on the topics covered in this technical library via Google Scholar. These publications form the scientific basis for the engineering criteria, standards, and methodology described in IAS guides.