The charge collection efficiency (CCE) of heavily irradiated silicon diode
detectors was investigated at temperatures between 77 and 200 K. The CCE wa
s found to depend on the radiation dose, bias voltage value and history, te
mperature, and bias current generated by light. The detector irradiated to
the highest fluence 2 x 10(15) n/cm(2) yields a MIP signal of at least 1500
0 e(-) both at 250 V forward bias voltage, and at 250 V reverse bias voltag
e in the presence of a light-generated current. The "Lazarus effect" was th
us shown to extend to fluences at least ten times higher than was previousl
y studied. (C) 2000 Elsevier Science B.V. All rights reserved.