Useful before authoritative
The tool exposes its formula, cites the published material behind its figures, and tells you what still needs professional verification.
Longlead AI · free browser tools
Free tools for earlier, better-informed planning.
Practical tools for shielding and secure-facility planning. Each runs on your device, shows the formula or published basis behind its result, and keeps the limits visible.
No account · no submissions · no network calls with your answers
Physicist review required before design or construction
Radiation shielding calculator
Estimate illustrative lead, concrete, or steel thickness from isotope-specific half-value layers using HVL × log₂(initial intensity / target intensity).
Open free tool →02Shielding vendor and physicist site survey required
MRI RF shielding calculator
Calculate MRI Larmor frequency and a preliminary below-cutoff waveguide length estimate. It keeps MRI OEM, site RF survey, and shielding-vendor requirements visible.
Open free tool →03Field verification and shielding design required
RF shielding effectiveness
Compare a far-field solid-sheet shielding estimate with the effect of one seam or aperture, while keeping the limiting factor and calculation limits visible.
Open free tool →04CTTA and AO requirements determine the actual project scope
SCIF cost estimator
Calculate a planning range from published SCIF construction rates, or view a vendor-specific container ROM, while keeping project requirements and site conditions visible.
Open free tool →05AO and CTTA determination required
TEMPEST/SCIF checklist
Review selected TEMPEST and ICD 705 planning details, record visible gaps, and keep the items that require AO or CTTA determination separate from your self-check progress.
Open free tool →Private by construction
Calculations and saved progress remain in your browser. Nothing is submitted to Longlead, and the page makes no network request with your inputs.
Planning, not promises
The output is a preliminary estimate. The relevant qualified professional must confirm the design before construction.