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Correlation of Beam Electron and LED Signal Losses under Irradiation and Long-term Recovery of Lead Tungstate Crystals

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arxiv physics/0504085 v1 pith:4ZIZOMKO submitted 2005-04-13 physics.ins-det hep-ex

Correlation of Beam Electron and LED Signal Losses under Irradiation and Long-term Recovery of Lead Tungstate Crystals

V.A.Batarin , J.Butler , A.M.Davidenko , A.A.Derevschikov , Y.M.Goncharenko , V.N.Grishin , V.A.Kachanov , A.S.Konstantinov
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V.I.Kravtsov Y.Kubota V.S.Lukanin Y.A.Matulenko Y.M.Melnick A.P.Meschanin N.E.Mikhalin N.G.Minaev V.V.Mochalov D.A.Morozov L.V.Nogach A.V.Ryazantsev P.A.Semenov V.K.Semenov K.E.Shestermanov L.F.Soloviev S.Stone A.V.Uzunian A.N.Vasiliev A.E.Yakutin J.Yarba
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classification physics.ins-det hep-ex
keywords crystalsdamageleadlighttungstatebeambeamscorrelation
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Radiation damage in lead tungstate crystals reduces their transparency. The calibration that relates the amount of light detected in such crystals to incident energy of photons or electrons is of paramount importance to maintaining the energy resolution the detection system. We report on tests of lead tungstate crystals, read out by photomultiplier tubes, exposed to irradiation by monoenergetic electron or pion beams. The beam electrons themselves were used to measure the scintillation light output, and a blue light emitting diode (LED) was used to track variations of crystals transparency. We report on the correlation of the LED measurement with radiation damage by the beams and also show that it can accurately monitor the crystals recovery from such damage.

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