ELOG 179Ta

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

179Ta

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Tue Jul 28 14:29:53 2020

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Proton beam - 27 MeV, 32 uA current, ~7 hrs. Total protons = 5.04E+18. 
Sample - 15 mm diameter, 1mm thick natural Hf foil. Hf+Zr&gt;99.93% and Zr content &lt;0.5%. Impurities in the sample listed in the attached document.

Sample holder:&nbsp;Simple foil&nbsp;holder which&nbsp;sandwiches the foil between two sheets. The front sheet has a hole for the incident beam.&nbsp;The back is water cooled and the front is compressed air cooled. We used it on helium&nbsp;cooled beam line as Hf (in podwer form) can catch fire on coming in contact with air. We had tested that the foil should not catch fire by placing a small sample of hafnium foil in the kiln at 1000 deg C at atmospheric pressure. But just to be cautious we used the helium cooling at the front of the foil during irradiation. Pictures of sample holder attached.

Sample oxidation: The foil got turned into white power during irradiation. We assume it underwent oxidation due to&nbsp;possible leaks in the target holder. In the last hour of irradiation, the vacuum window had failed. The picture of sample after irradiation is attached. 
 
Contact dose rate on 03 Jun 2019 was &gt;4mSv/hr.

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