Source: https://guthlabs.ai/docs/instruments/radioactive-decay-chain-simulator/qualification/

instrument qualification / verified-with-binding-errata

# Radioactive Decay Chain Simulator qualification

Verified with errata that must be applied at binding time.

Status: **VERIFIED_WITH_ERRATA**Lifecycle: **verified-with-binding-errata**

## Ledger verdict

Verified with errata that must be applied at binding time.

**Status**: VERIFIED_WITH_ERRATA

**Tranche**: tranche-6

**Review vectors**: 4

**Ledger rows**: 1

## Applied errata

````
[
  {
    "vector": 2,
    "field": "activities.D",
    "wrong": 38.4375559722,
    "correct": 38.4329654152,
    "cause": "final multiplication slip: lambda_D*N_D = 0.693147*55.44705 = 38.43297 (her N_D is correct)"
  },
  {
    "vector": 3,
    "field": "quantities.D / activities.D",
    "wrong": "152.368927 / 0.878028",
    "correct": "609.475708 / 3.520470",
    "cause": "Bateman numerator uses the DAUGHTER's lambda instead of the parent's: N_D = N_P0*lambda_P/(lambda_D-lambda_P)*(...) — she used lambda_D, a wrong-factor-family error (factor lambda_D/lambda_P = 1/4)"
  },
  {
    "vector": 4,
    "field": "activities.P3",
    "wrong": 30.3406938386,
    "correct": 30.353111405,
    "cause": "final multiplication slip: (ln2/4)*175.161133 = 30.35311 (her three-term Bateman N_P3 is exactly right)"
  }
]
````

## Adversarial re-test context

The full catalog was re-tested from boundary, convention, and self-check angles in 2,787 requests. Five genuine computational defects were independently verified and corrected. This page reports the current ledger state for this instrument; it does not imply product deployment or interface qualification.

## Release gate

Bind every attached correction, replay the affected vectors, enforce boundary validation, and preserve evidence before describing the executable surface as qualified.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/radioactive-decay-chain-simulator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/radioactive-decay-chain-simulator/mechanism/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/radioactive-decay-chain-simulator/implementation/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `STRESS_TEST_RECEIPT.json`

- `tranche errata record`