# 📐 L2 Spec — Brachytherapy Dose Imaging Mismatch-Only Spec
**ID:** `L2-052-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-052`](/artifact/l1/L1-052)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553389
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 |
| W | px | 128 |
| Z | — | 32 – 512 |
| Snr db | dB | 15.0 – 40.0 |
| N sources | — | 1 – 100 |
| Applicator motion | — | 0.0 – 3.0 |
| Tissue heterogeneity | — | 0.0 – 0.3 |
| Source position error | — | 0.0 – 3.0 |
| Inter source shielding | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
18.0 + 0.3 * SNR_dB - 3.0 * source_position_error - 10.0 * tissue_heterogeneity - 3.0 * applicator_motion
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`be113d2af686c7d970f36e26da001f816a6e25ef8e540ef3284a9845685adc94`
## 5. On-chain Registration
- **Chain hash:** `0x57fe80741cff1ded6c44f3f035b7f1a53da60d41bd7fe3c8c0e31818d2850518`
- **Chain tx hash:** `0xb44e7a59bef8c91afbdad19b1059a6f795ae8e4b4d6a7f913ad9d97ced6ebe51`
- **Chain block:** `41553389`
---
## File Mapping
This bundle consists of: `L2-052-001.md`, `L2-052-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-052-001.md` | Source of truth — edit this | Human or LLM |
| `L2-052-001.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 `L2-052-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._