Radon Emanation Testing for DRIFT
Radon Emanation Testing for DRIFT
Radon Emanation Testing for DRIFT
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!Rn <strong>Emanation</strong><strong>Radon</strong> emanation into chamberRate of changeof number of Rnatoms (N)dNdt = K " N TN(t) Rn atomsRn emanation:K (atoms/sec)<strong>Emanation</strong>chamber:0.033m 37!Solving:Number of Rn atoms (N)!Rn emanationrateRn decayT = 1/e Rn decay time= 3.85/ln2 = 5.52 daysNumber of Rn decays (dN/dt decay= N/T)dNdt (Rn _ decay)N = KT(1" e "t /T )= K(1" e "t /T )KRateDecay rate tends toemanation rate at large tT 1/e= 5.52dayse.g: at t = 7 daysdN/dt =72% of eqm levelTime
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