Cu 64
12.7 h
ε
β- 0.6, β+ 0.7
γ (1364)

Chemical properties

In solution Cu-64 is usually in divalent state. It can be radiolabelled with macrocyclic chelators. DOTA is being used, but other, specific copper chelators such as MeCOSar may provide improved stability

Nuclear properties

Cu-64 decays with a half-life of 12.70 h by positron emission (17.6%) or electron capture (43.9%) to stable Ni-64 and by beta-minus emission (38.5%) to stable Zn-64 respectively. The emitted positrons have 278 keV average energy and 653 keV maximum energy and the emitted low energy beta-minus spectrum has 191 keV average energy and 579 keV maximum energy.

In addition to beta-minus emission it also emits low energy Auger electrons , thus emitting in total about 0.79 electrons or positrons (with energies above 6 keV) per decay.

Cu-64 emits only one weak gamma-ray at 1345.8 keV (0.48%).

The total electron energy emitted per decay is 124 keV, the total photon energy per decay is 187 keV .

Production

Cu-64 can be produced by different methods , e.g. proton irradiation of enriched Ni-64 targets at Hevesy Laboratory at DTU, C30 cyclotron at NCBJ and Injector 2 at PSI or deuteron irradiation of enriched Ni-64 targets at ARRONAX. In addition, low-specific activity (>0.1 GBq/mg) Cu-64 is produced at NCBJ by irradiating enriched Cu-63 targets in the MARIA reactor.

Distribution

The radiochemical separation is performed at the same laboratory where the irradiation took place. Activity will be shipped from there to the users in solution or in form of a dried deposit respectively.

The specifications given here are the ones for production at Hevesy lab (DTU, Risø, Denmark). The characteristics of the produced Cu-64 varies for the other suppliers (ARRONAX, Nantes, France; PSI, Villigen, Switzerland; NCBJ, Otwock-Swierk, Poland), and the best solution for a given project will be discussed between PRISMAP and the users.

Examples of use

  • Cu-64 forms a theranostic pair together with Cu-67.
  • Due to its beta emission Cu-64 may also be considered a theranostic nuclide by itself.
  • Cu-64 labelled compounds ranging from small molecules (peptides, etc.) to antibodies are regularly used in clinics and clinical trials respectively. 

Purity grades available

research
preclinical
GMP

No carrier added (n.c.a.)

Available in n.c.a form (cyclotron produced) or carrier added form (reactor produced)
ParameterSpecifications
Half-life12.7 h
DaughterStable Ni-64 and stable Zn-64
Branching Ratio/Decay17.6% β+, 43.9% EC, 38.5%β-
ProductionNi-64(p,n)Cu-64
Purificationsingle step cation exchange chromatography
Chemical FormDry CuCl2
Specific Activity>500 GBq/µmol at end of chemistry (measured by ICP-OES)
Radionuclidic Purity>99% (Co-56, Co-57, Co-58 each below 0.01%)
Radiochemical Purityn.a.
Chemical PurityMetal impurities and copper contents determined by ICP-OES for each batch: Ni, Zn and Fe each <1 µg/GBq
Identification1346 keV gamma line and 511 keV annihilation gammas present
AppearanceInvisible deposit at bottom of glass vial
pHNot applicable
Activity available1-10 GBq
AvailabilityDispatch of batches 1-3 GBq every Tuesday and Thursday 09:30 AM. Larger batches up to 10 GBq on request.
GradePreclinical grade or GMP (as labelling intermediary, however no PhEur monograph exists), n.c.a.
Other informationProduct is normally shipped in dry state, in “empty vials” but ready for reconstitution with what buffer the user prefers, and then ready for labelling of e.g. DOTA-compounds. Upon request, product can be shipped in 0.05 M HCl (1-2 ml) or Ammonium Acetate buffer (1 M, 1-2 ml). Bioburden and endotoxin burden can be analysed post release, upon request.

Applications

  • PET
  • β-therapy

Point of supply

  • Nantes, France
  • Risø, Denmark
  • Villigen, Switzerland
  • Otwock-Swierk, Poland

Involved production facilities

ARRONAX, France
DTU, Denmark
PSI, Switzerland
NCBJ, Poland