Source–Pathway–Receptor Propagation

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A harmful source or contaminating fraction can reach new targets through migration, transfer, diffusion, or establishment pathways that controls do not see or sever.

24 mechanisms across 4 solution archetypes. This is a recurring problem pattern within Hazard Exposure & Uncontained Harm; the mechanisms below inherit it from the primary archetype they instantiate.

• After-Action Pathway Update — After an incident or near-miss, rebuilds the source-pathway-receptor model to add the route that was actually used and the links that turned out to be cuttable.
• Barrier Interposition — Places a physical barrier across a chosen link in the route, adding one engineered layer whose only job is to stop the hazard from traversing that step.
• Buffer Zone Design — Reserves a band of space between a source and its receptors, sized so the hazard's reach in its carrier medium falls short of who must be protected.
• Contact Time Reduction — Shrinks exposure by cutting how long the receptor stays in contact at the interface, lowering cumulative dose without changing the concentration present.
• Control Effectiveness Review — A periodic review that checks whether controls reduce spread, avoid collateral harm, and remain effective against adapted entrant behavior.
• Exposure Sampling Transect — Lays a line of samplers from source outward to measure the real exposure gradient, so residual exposure is mapped where receptors actually are rather than assumed.
• Filtration or Scrubbing — Lets the carrier medium keep flowing but strips the hazard out of it in transit, so what arrives downstream is cleaned rather than blocked.
• Firebreak or Buffer Zone Map — A map or rule set showing where movement, replication, transfer, or interaction should pause to keep the entrant from crossing into new zones.
• Incumbent Refuge Program — A reserve, safe harbor, protected segment, restoration patch, or support program that preserves incumbent capacity while controls take effect.
• Intake Inspection and Quarantine Protocol — A screening and temporary isolation procedure for new imports, accounts, code, materials, practices, or organisms before full admission.
• Movement Permit or Access Gate — A controlled approval gate for movement across a pathway, such as transport, deployment, account capability, import, or release into production.
• Multi-Barrier Verification Drill — Exercises a layered defense by disabling one barrier at a time and checking that no path then reaches a receptor, proving the redundancy is real.
• Pathway Reachability Analysis — Treats exposure as a graph problem — computes whether a hazard can still reach a target after a proposed cut, and exposes the substitute routes that keep it reachable.
• Pathway Risk Register — A maintained list of arrival pathways, carriers, weak interfaces, and control owners ranked by introduction pressure and control gap.
• Personal or Local Protective Control — Shields the receptor at the last line — worn or point-of-use protection on the specific contact interface — sized to who is most vulnerable and ready to deploy when exposure spikes.
• Rapid Response Playbook — A preauthorized sequence for triage, confirmation, local containment, escalation, communication, and post-action learning.
• Risk Migration Review — Checks, after a control goes in, whether the hazard actually fell or merely moved — to a substitute route, downstream, or onto a more vulnerable population.
• Route Closure or Segmentation — Severs or compartmentalizes the specific links a hazard travels, then assigns an owner and a keep-closed cadence so a cut route cannot quietly reopen.
• Sentinel Monitoring Network — A distributed monitoring setup that samples high-risk entry points and vulnerable refuges for early establishment signals.
• Sentinel Receptor Monitoring — Places sensitive indicator receptors where a hazard would arrive first, so any breakthrough shows up on a canary before it reaches the population being protected.
• Source Elimination or Substitution — Removes the hazard at its origin or swaps in a benign substitute, so there is no source left to route anywhere — verified against a dose threshold, not just 'less of it.'
• Source Reduction Program — Lowers how much hazard enters the pathway at its upstream sources, so every barrier, buffer, and filter downstream has less to hold back.
• Vector or Carrier Control — Suppresses the living or physical carrier that ferries a hazard along the pathway, timed to its seasonal abundance — knock down the vector and the route it embodies collapses.
• Ventilation or Flow Redirection — Moves or dilutes the carrying medium — air or water — so its flow sweeps the hazard away from the receptor and holds concentration at the point of contact below the harmful dose.