Th-227 is usually in tetravalent state.
Th-227 decays by ɑ decay with a half-life of 18.68(9) days. Its decay chain involving Ra-223 (T1/2 = 11.4 d), Rn-219 (T1/2 = 4 s), Po-215 (T1/2 = 1.8 ms), Pb-211 (T1/2 = 36 min), Bi-211 (T1/2 = 2.2 min) and Tl-207 (T1/2 = 4.8 min) leads to stable Pb-207. Including its short-lived decay chain, the cumulative ɑ emission is 500% per Th-227 decay.
Th-227 emits γ-rays, notably at 236 (12.9%), its daughter Ra-223 emits X-rays from 81 to 98 keV (49.6%) and γ-rays, notably 269 keV (13.3%), its grand-daughter Rn-219 emits γ-rays at 271 keV (10.8%) and Bi-211 emits γ-rays at 351 keV (13%). These are the principal photon emissions of the decay chain that enable SPECT-imaging .
Th-227 is produced at JRC Karlsruhe by chemical separation from an Ac-227 source.
Radiochemical separations are performed at the production facility JRC Karlsruhe (JRC, Karlsruhe, International). Activity will be shipped from there to the users in dry form.
Examples of use
|Production route||Ac-227→Th-227 generator|
|Daughter||Decay chain involving radioactive Ra-223, Rn-219, Po-215, Pb-211, Bi-211, Tl-207 leading to stable Pb-207: cumulative 500% α, 200% β-|
|Primary Container||2.5 mL borosilicate glass V-vial with silicon rubber screw cap|
|Product Grade||Preclinical, n.c.a.|
|Chemical Form||Dried nitric or chloridic form|
|Radioactive Concentration (gamma spectrometry)||n.a.|
|Radionuclide identification (gamma spectrometry)||236 keV and 256 keV gamma lines present|
|Radionuclidic Purity (gamma spectrometry)||n.a.|
|Chemical purity (ICP-OES)||n.a.|
|Molar activity (ICP-OES)||n.a.|
|Apparent Molar Activity||n.a.|
|pH (pH strips)||n.a.|
|Activity available||Few MBq upon request|
|Activity limit for UN2910 (excepted package) shipment||5 MBq in dry state (consider also grow-in of Ra-223!)|