Scandium43QualityChecker

Utility description: Scandium-43

Scandium-43 Quality Checker — Scandium-43 for PET Imaging (Theranostics)

ℹ️  Utility checks critical parameters of Scandium-43:
    • Radionuclidic purity (≥99.0%)
    • Scandium-44 impurity (≤1.0%)
    • Scandium-46 impurity (≤0.1%)
    • Radiochemical purity (≥95%, DOTA/NOTA complex)
    • Free Scandium (≤5%)
    • pH, endotoxins, sterility, heavy metals

⚠️  CRITICAL: Scandium-43 is the ideal partner for Scandium-47 (therapy).
    Sc-44 impurity degrades PET image quality due to high-energy gamma quanta.

Usage:
  Scandium43QualityChecker.exe                            → demo mode (console output)
  Scandium43QualityChecker.exe input.csv output.json      → evaluate your data

Input format:
BatchNumber,TotalActivityMBq,RadionuclidicPurityPercent,Scandium44ImpurityPercent,Scandium46ImpurityPercent,RadiochemicalPurityPercent,FreeScandiumPercent,pH,EndotoxinsEU,SterilityTest,HeavyMetalsPPM,ProductType

Example (sterility: 0=sterile, 1=contaminated):
  SC43-DOTA-2026-001,200.0,99.5,0.4,0.01,98.0,2.0,5.5,30.0,0,2,DOTA-Peptide

Supported product types:
• DOTA-Peptide — peptides for neuroendocrine tumor imaging
• NOTA-Antibody — antibodies for immuno-PET
• FreeIon — biodistribution studies

— WHY IS THIS NEEDED?
Scandium-43 (T½=3.89 h) is a promising positron-emitting isotope for PET:
• Ideal theranostic pair with Scandium-47 (beta-emitter, T½=3.35 d)
• Chemically identical to Sc-47, ensuring identical biodistribution for diagnostic and therapeutic doses
• Positron energy E_max=1.2 MeV provides good image resolution
• Produced in cyclotron (Ca-43 proton irradiation) or from Ti-44/Sc-43 generator

⚠️  CRITICAL:
• Radionuclidic purity ≥99.0% — presence of other scandium isotopes is unacceptable.
• Scandium-44 (T½=3.97 h) impurity ≤1.0% — Sc-44 often co-produces. It emits high-energy gamma quanta (1157 keV), creating noise in PET images and increasing patient dose without diagnostic benefit.
• Scandium-46 (T½=83.8 d) impurity ≤0.1% — Long-lived impurity, creating radioactive waste issues and long-term irradiation.
• Radiochemical purity ≥95% — Scandium forms very stable complexes with macrocyclic chelators (DOTA, NOTA). High RCP ensures in vivo stability.
• Free Scandium ≤5% — Ionic scandium accumulates in liver and bones, distorting images and increasing dose to these organs.
• Heavy metals ≤10 ppm — Metal ions (Fe, Zn, Cu) compete with scandium for chelator binding sites, reducing labeling yield.
• pH 4.5–7.5, Endotoxins ≤175 EU/vial, Sterility — standard safety requirements.

Key features:
• Control of specific scandium isotopic impurities (Sc-44, Sc-46)
• Assessment of suitability for theranostic application (pair with Sc-47)
• Heavy metal control, critical for labeling efficiency
• Support for various bioconjugates (peptides, antibodies)

Critical parameters:
• Radionuclidic purity: ≥99.0%
• Sc-44 impurity: ≤1.0%
• Sc-46 impurity: ≤0.1%
• Radiochemical purity: ≥95.0%
• Free Scandium: ≤5.0%
• Heavy metals: ≤10 ppm
• pH: 4.5–7.5
• Endotoxins: ≤175 EU/vial
• Sterility: no microbial growth

💡 Usage tips:
1. Separation of Sc-43 and Sc-44 requires mass separation or careful selection of proton beam energy during production.
2. Labeling DOTA-peptides requires heating (95°C, 15-20 min), NOTA-conjugates can be labeled at room temperature or mild heating.
3. Presence of heavy metals in buffer or precursor sharply reduces specific activity. Use ultra-pure reagents.
4. Sc-43 is ideal for imaging processes with intermediate kinetics (peptides, small proteins).

⚠️ Note: Scandium-43 represents the "gold standard" of theranostics within a single element. Unlike Ga-68/Lu-177 pairs, where gallium and lutetium chemistry differs, scandium isotopes are chemically identical. This means diagnostic scan with Sc-43 accurately predicts distribution of therapeutic Sc-47. However, Sc-44 impurity is the main technical challenge in cyclotron production.