Chemical properties
Th-227 is usually in tetravalent state.
Nuclear properties
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 .
Production
Th-227 is produced at JRC Karlsruhe by chemical separation from an Ac-227 source.
Distribution
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
Parameter | Specifications |
---|---|
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- |
Half-life | 18.7 d |
Processing | |
Primary Container | 2.5 mL borosilicate glass V-vial with silicon rubber screw cap |
Product Grade | Preclinical, n.c.a. |
Physical Form | Solid |
Chemical Form | Dried nitric or chloridic form |
Radioactive Concentration (gamma spectrometry) | n.a. |
Appearance | Dried solid |
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. |
Microbiological quality | n.a. |
Bacterial endotoxin | n.a. |
pH (pH strips) | n.a. |
Additional information | |
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!) |
Other information |