# 📐 L2 Spec — Muon Tomography Spec (nuclear safeguards family)
**ID:** `L2-132-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-132`](/artifact/l1/L1-132)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.6 · **Delta tier:** 5
> **⛓ On-chain block:** 41554217
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| N muon | — | 10000.0 – 1000000000.0 |
| Acq time hours | — | 1 – 720 |
| Tracker res mm | mm | 0.1 – 10 |
| Momentum unknown | — | 0 – 1 |
| Angular resolution | — | 1 – 50 |
| Flux inhomogeneity | — | 0.0 – 0.3 |
| Background contamination | — | 0.0 – 0.2 |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.02 + 1e5/N_muon + 0.1 * momentum_unknown + 0.1 * flux_inhomogeneity + 0.001 * angular_resolution
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.6 |
| Delta tier | 5 |
## 4. Fingerprint
`e2f69d4fe60f984137b3a01930574f152e1311a5e08c0862cec1ef202fde818f`
## 5. On-chain Registration
- **Chain hash:** `0xb3bbf9d145ca5190c7579273a8674a9d0b75b82b4085d8f011b9c4b4363cfcb2`
- **Chain tx hash:** `0xdcf2833745e6cde673be96bdc8053d5be8365bc24cadf009301eceb63e5b06c5`
- **Chain block:** `41554217`
---
## File Mapping
This bundle consists of: `L2-132-001.md`, `L2-132-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-132-001.md` | Source of truth — edit this | Human or LLM |
| `L2-132-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-132-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._