ELOG ISOLDE

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

ISOLDE

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Entry time:

Sat Nov 11 17:19:54 2017

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Placed a hand held rad monitor near the faraday cup and took rate readings every 20 seconds, right after inserting the gate valve in front of SEC:

seconds counts/s

0&nbsp;&nbsp; &nbsp;590 
20&nbsp;&nbsp; &nbsp;499 
40&nbsp;&nbsp; &nbsp;474 
60&nbsp;&nbsp; &nbsp;400 
80&nbsp;&nbsp; &nbsp;353 
100&nbsp;&nbsp; &nbsp;290 
120&nbsp;&nbsp; &nbsp;259 
140&nbsp;&nbsp; &nbsp;234 
160&nbsp;&nbsp; &nbsp;207 
180&nbsp;&nbsp; &nbsp;187 
200&nbsp;&nbsp; &nbsp;175 
220&nbsp;&nbsp; &nbsp;146 
240&nbsp;&nbsp; &nbsp;135 
260&nbsp;&nbsp; &nbsp;124 
280&nbsp;&nbsp; &nbsp;120 
300&nbsp;&nbsp; &nbsp;109 
320&nbsp;&nbsp; &nbsp;107 
340&nbsp;&nbsp; &nbsp;103 
360&nbsp;&nbsp; &nbsp;85 
380&nbsp;&nbsp; &nbsp;86 
400&nbsp;&nbsp; &nbsp;84 
420&nbsp;&nbsp; &nbsp;94 
440&nbsp;&nbsp; &nbsp;81 
460&nbsp;&nbsp; &nbsp;76 
480&nbsp;&nbsp; &nbsp;76 
500&nbsp;&nbsp; &nbsp;74

Then fitted this for half life.

Assuming a steady state background of 70 cps, and using the first 7 data points... the half life comes out as 82.1 +/-3.9 s.

Excellent agreement with known halflife of 59Cu.

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