Phosphorus32ChromicPhosphateChecker

Utility description: Phosphorus-32 Chromic Phosphate

Phosphorus-32 Chromic Phosphate Quality Checker — P-32 Colloid for Radiosynovectomy

ℹ️  Utility checks critical parameters of colloidal Phosphorus-32:
    • Radionuclidic purity (≥99.9%)
    • Phosphorus-33 impurity (≤0.1%)
    • Particle size (0.5–10.0 μm) — CRITICAL!
    • Colloidal stability (≥95%)
    • Free phosphate (≤5%)
    • pH, endotoxins, sterility

⚠️  CRITICAL: Particles <0.5 μm leak from joint to lymph nodes!
    Particles >10 μm cause local tissue necrosis!
    Free phosphate accumulates in bone marrow and skeleton!

Usage:
  Phosphorus32ChromicPhosphateChecker.exe                            → demo mode (console output)
  Phosphorus32ChromicPhosphateChecker.exe input.csv output.json      → evaluate your data

Input format:
BatchNumber,TotalActivityMBq,RadionuclidicPurityPercent,Phosphorus33ImpurityPercent,ParticleSizeMicrons,ColloidalStabilityPercent,pH,EndotoxinsEU,SterilityTest,FreePhosphatePercent,ProductType

Example (sterility: 0=sterile, 1=contaminated):
  P32-CR-2026-005,370.0,99.95,0.05,2.5,98.5,6.0,50.0,0,1.5,Synovectomy

Supported product types:
• Synovectomy — radiosynovectomy (knee, elbow joints)
• Intracavitary — intracavitary therapy (pleural, peritoneal effusions)

— WHY IS THIS NEEDED?
Phosphorus-32 as colloidal chromic phosphate (CrPO4) is a classic agent for local radiation therapy:
• 14.29-day half-life — optimal for prolonged effect on synovial membrane
• Pure beta-emitter (E_max = 1.71 MeV) — tissue penetration depth ~8 mm, ideal for synovitis treatment
• Does not leave the joint cavity if particle size is correct (0.5–10 μm)
• Used in rheumatoid arthritis, pigmented villonodular synovitis

⚠️  CRITICAL:
• Particle size 0.5–10.0 μm — MAIN SAFETY PARAMETER.
  - < 0.5 μm: Particles pass through synovial barrier, accumulate in regional lymph nodes and may enter systemic circulation.
  - > 10.0 μm: Risk of uneven distribution, aggregation, and local tissue necrosis ("hot spots").
• Colloidal stability ≥95% — ensures phosphorus is in insoluble form.
• Free phosphate ≤5% — SOLUBLE phosphorus-32 metabolizes like normal phosphate and accumulates in bones (osteogenic cells), causing unjustified irradiation of bone marrow!
• Phosphorus-33 impurity ≤0.1% — P-33 has softer radiation but longer half-life (25.3 days), increasing integral dose.
• pH 4.0–7.0 — to minimize pain syndrome during injection.
• Endotoxins ≤175 EU/vial — standard for injectables.
• Sterility — MANDATORY for intra-articular and intracavitary injections!

Key features:
• Strict control of particle size (Particle Size Analysis)
• Check for free phosphate (TLC method)
• Radionuclidic purity assessment with focus on P-33
• Support for synovectomy and intracavitary therapy modes

Critical parameters:
• Radionuclidic purity: ≥99.9%
• P-33 impurity: ≤0.1%
• Particle size: 0.5–10.0 μm
• Colloidal stability: ≥95.0%
• Free phosphate: ≤5.0%
• pH: 4.0–7.0
• Endotoxins: ≤175 EU/vial
• Sterility: no microbial growth

💡 Usage tips:
1. Particle size controlled by electron microscopy or dynamic light scattering (DLS).
2. Free phosphate determined by thin-layer chromatography (TLC).
3. Product must be stored in suspension; vigorous shaking is required before use.
4. During injection, avoid extravasation into subcutaneous tissue (causes necrosis).
5. If free phosphate >5%, batch is rejected due to risk of systemic skeletal irradiation.

⚠️ Note: Unlike soluble radiopharmaceuticals, colloidal P-32 acts locally. Any disruption of colloid integrity or incorrect particle size transforms it from a local therapeutic agent into a source of systemic radiation damage.