How to estimate the upper limit mass of electron neutrino?

oosgood
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If I just know the energy range of it is 10-35 MeV, and they can interact with detector for 10 seconds, how to deduce the upper limit mass of it?
 
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As I understand it they measure the maximum energetic electron from the beta decay of tritium. The missing energy from the mass difference of H3 minus He3 minus the most energetic electron produced is an upper limit on the rest mass of an electron neutrino.
 

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