AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
179Ta
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Tue Mar 25 20:23:49 2025
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<p>Gamma-spectra recorded on 03/06/2019, 24/06/2019, and 05/08/2019 analysed for identifyiing isotopes produced and estimating their activities. The spectra are shown in attached pictures with the identified peaks labelled.</p> <p>Ta179 activity given here was calculated by analysing the 61 keV peak assuming that this peak would be dominated by X-rays from Hf175 and and Ta179 (as these isotopes have at least 3 orders of magnitude larger activity than any other isotope). With that assumption, and by using the value for Hf175 activity (1.12E+04 on 5 Aug) that was calculated using its gamma peaks, the value of Ta179 activity on 5 Aug was estimated to be 1.81E+04 kBq.</p> <p>A summary of most active isotopes at the time of shipment (around 24 Dec 2019) is shown in table below:</p> <table border="1" cellpadding="0" cellspacing="0"> <tbody> <tr> <td> </td> <td> </td> <td>73 d since irr</td> <td> </td> <td>7 mnths since irr</td> </tr> <tr> <td>Isotope</td> <td>halflife (d)</td> <td>Activity on 05 Aug (kBq)</td> <td>error (kBq)</td> <td>Activity on 24Dec (kBq)</td> </tr> <tr> <td>179Ta</td> <td>664.3</td> <td>1.81E+04</td> <td>>200</td> <td>1.55E+04</td> </tr> <tr> <td>177Ta</td> <td>56.56</td> <td>undetermined</td> <td> </td> <td> </td> </tr> <tr> <td>175Hf</td> <td>70</td> <td>1.12E+04</td> <td>14.16</td> <td>2.80E+03</td> </tr> <tr> <td>179Hf</td> <td>25.05</td> <td>1.45E+01</td> <td>0.91</td> <td>3.01E-01</td> </tr> <tr> <td>181Hf</td> <td>42.39</td> <td>1.68E+01</td> <td>0.97</td> <td>1.71E+00</td> </tr> <tr> <td>172Lu</td> <td>6.7</td> <td>4.61E+00</td> <td>0.50</td> <td>2.36E-06</td> </tr> <tr> <td>173Lu</td> <td>485.45</td> <td>3.55E+01</td> <td>6.06</td> <td>2.90E+01</td> </tr> <tr> <td>174Lu</td> <td>142</td> <td>undetermined</td> <td> </td> <td> </td> </tr> <tr> <td>177Lu</td> <td>6.65</td> <td>undetermined</td> <td> </td> <td> </td> </tr> <tr> <td>88Zr</td> <td>83.4</td> <td>5.04E+00</td> <td>1.04</td> <td>1.57E+00</td> </tr> <tr> <td>88Y</td> <td>106.63</td> <td>6.90E-01</td> <td>0.18</td> <td>2.78E-01</td> </tr> <tr> <td>95Nb</td> <td>34.99</td> <td>5.11E+00</td> <td>0.40</td> <td>3.19E-01</td> </tr> <tr> <td>57Co</td> <td>271.74</td> <td>1.23E+01</td> <td>1.78</td> <td>8.57E+00</td> </tr> <tr> <td>58Co</td> <td>70.86</td> <td>7.32E-01</td> <td>0.25</td> <td>1.86E-01</td> </tr> <tr> <td>65Zn</td> <td>243.93</td> <td>5.71E+00</td> <td>0.69</td> <td>3.84E+00</td> </tr> <tr> <td>54Mn</td> <td>312.2</td> <td>2.63E+00</td> <td>0.30</td> <td>1.93E+00</td> </tr> <tr> <td>Total</td> <td> </td> <td>2.94E+04</td> <td> </td> <td>1.83E+04</td> </tr> </tbody> </table>
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