Tm 165
30.1 h
- 0.27)
γ 243, 47, 297...

Chemical properties

Tm-165 is a radiolanthanide, usually in trivalent state.

Nuclear properties

Tm-165 decays by electron capture decay with a half-life of 30.1 hours to Er-165 that decays in turn with 10.3 hours half-life to stable Ho-165. Details on the properties of Er-165 are found here .


Tm-165 is produced by spallation reactions in thick tantalum targets with protons of high energy . The radionuclides are released from the target by high temperature and separated by off-line mass separation at the production facility MEDICIS at CERN as implanted ions into zinc-, aluminum- coated gold foils or NaCl-coated aluminum foils ,. The implanted collections are shipped as implanted and still need to undergo a dissolution and radiochemical purification separation step from the progenity of co-implanted Tb-149 isobaric oxide ions.


Activity will be shipped in form of ion-implanted solid samples.

Examples of use

  • The main application of Tm-165 is in Tm-165/Er-165 generators making available non-carrier-added Er-165. Certain types have been reported , others are under development.

Purity grades available


No carrier added (n.c.a.)

Production routeTa-nat(p,spallation)
DecayDecays to Er-165 (10.3 h half-life) that decays to stable Ho-165: 100% EC
Half-life1.25 d
Primary Containern.a.
Product Graden.c.a. (mass separation)
Physical FormSolid
Chemical formImplanted into solid foil
Radioactive Concentration (gamma spectrometry)n.a.
Radionuclide Identification (gamma spectrometry)243 keV, 297 keV and 807 keV gamma lines present
Radionuclidic purity (gamma spectrometry)>99.9% at calibration time (<0.1% Gd-149 and Eu-145 as Tb-149 progeny)
Chemical purity (ICP-OES)n.a.
Molar activity (ICP-OES)n.a.
Apparent Molar Activityn.a.
Microbiological qualityn.a.
Bacterial endotoxinn.a.
pH (pH strips)n.a.
Additional information
Activity availablet.b.d.
Activity limit for UN2910 (excepted package) shipment20 MBq in dry state


  • Generator

Point of supply

  • Geneva, Switzerland

Involved production facilities

CERN, International

Involved biomedical facilities

To find out in which biomedical facilities you can use this radionuclide, contact the helpdesk.