# Germanium-68/gallium-68 generators

Source: https://nuclide.cc/technologies/ge68-ga68-generators/  
Nuclide record `ge68-ga68-generators` (Technology). Data CC BY-NC 4.0, attribute "Data from Nuclide (nuclide.cc)"; commercial use needs a licence.

## TL;DR

A compact column loaded with a long-lasting parent isotope lets a PET radiopharmacy produce fresh gallium-68, used in scans such as PSMA and DOTATATE PET, on demand without needing a cyclotron.

## Summary

The 68Ge/68Ga generator holds parent germanium-68 (half-life 270.8-271 days) fixed on a solid-phase column, commonly TiO2, SiO2, SnO2 or hydrous stannic-oxide-type matrices, and yields daughter gallium-68 (half-life 67.7-68 minutes) by elution with dilute hydrochloric acid (typically 0.05-0.1 M HCl). Because 68Ge has a nine-month half-life, a single generator supplies clinically useful 68Ga for roughly a year, sufficient for hundreds of elutions, without requiring an on-site cyclotron. Regulatory eluate specifications (Ph. Eur. monograph 2464) require 68Ge breakthrough of no more than 0.001% of eluted activity; generators are typically eluted at least once per working day and pre-eluted with 5x4-10 mL washes after breaks of 72-96 hours to keep breakthrough within limits.

Eluate volumes (4-10 mL) are usually too dilute for direct high-specific-activity radiolabelling, so cation- or anion-exchange fractionation/concentration steps are commonly used before adding the eluate to a peptide precursor (for example DOTATATE or PSMA-11) at 90-95°C for 10-20 minutes to form the 68Ga complex. In routine operation, elution yields around 60-85% of theoretical maximum activity have been reported over hundreds of elutions per generator-year, with radiochemical purity of finished 68Ga-DOTATOC/68Ga-PSMA products typically exceeding 95-99%. The approach underlies most 68Ga-DOTATATE (NETSPOT-type kits) and 68Ga-PSMA-11 production worldwide and is complementary to cyclotron-based 68Ga production, which is increasingly used where generator throughput or supply is constrained.

## Fields

- Kind: Technology
- Last checked: 2026-09-22
- Also known as: 68Ge/68Ga generator; GalliaPharm
- Tags: generator; gallium-68; PET
- Principle: The nine-month half-life parent germanium-68 is fixed on a solid-phase column (titanium, tin or silicon oxide); eluting the column with dilute hydrochloric acid selectively washes off the freshly formed gallium-68 daughter while germanium-68 stays bound, so the same column keeps supplying fresh gallium-68 for about a year without needing a cyclotron on site.
- Since: First 68Ge/68Ga generator systems developed in 1961; modern GMP-grade generators from the 2000s-2010s

## Sources

- EMA EPAR: GalliaPharm 68Ge/68Ga generator public assessment report: https://www.ema.europa.eu/en/documents/assessment-report/galliapharm-epar-public-assessment-report_en.pdf
- Good practices for 68Ga radiopharmaceutical production (EJNMMI Radiopharm. Chem. 2022): https://link.springer.com/article/10.1186/s41181-022-00180-1
- The 68Ge/68Ga generator for enhancing productivity: multi-year performance data (PMC 2026): https://pmc.ncbi.nlm.nih.gov/articles/PMC13096388/

## Connected records

- technologies: [Cold kit formulation](https://nuclide.cc/technologies/cold-kit-formulation/), [Cyclotron isotope production (F-18, Ga-68, Cu-64, Zr-89, At-211)](https://nuclide.cc/technologies/cyclotron-isotope-production/), [PSMA PET](https://nuclide.cc/technologies/psma-pet/), [Radionuclide generators and cold kits](https://nuclide.cc/technologies/radionuclide-generators-kits/), [Somatostatin receptor PET (68Ga/64Cu-DOTATATE)](https://nuclide.cc/technologies/sstr-pet/)
- isotopes: [Gallium-68](https://nuclide.cc/isotopes/ga-68/), [Germanium-68](https://nuclide.cc/isotopes/ge-68/)

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