Irradiation at TIT 2004/04/05-06
--------------------------------

Rates
@0cm 118kRad/h
@10cm 61.3kRad/h
@20cm 16.6kRad/h
@24cm 11.5kRad/h
@30cm 7.36kRad/h
@70cm 1.36kRad/h

Pixel irradiation
-----------------
2M sample: 17h@118kRad/h (with aminogray 9602241/209)
200k sample: 17h@11.5kRad/h
from 2004/04/05 12:15 to 2004/04/06 05:33

PIN irradiation
---------------

Amp. feedback setup a(board)b(pin)c(switch)
any any 0 = 100MOhm
111 9.07M
112 0.98M
113 99.8k

121 9.04M
122 0.98M
123 99.7k

211 9.3M
212 0.98M
213 99.7k

221 9.01M
222 0.98M
223 99.9k

Darwin Amp.   Rate Total Volt. Material
ch11   pin111 61.3 1042  0.29  3mm Al
ch12   pin121 61.3 1042  0.29  /
ch13   pin210 61.3 1042  3.4   /
ch14   pin221 61.3 1042  0.33  /

2004/04/05 12:15 source up
2004/04/06 05:33 source down

Material test 2004/04/05

      10:21-10:26 10:30-10:32   10:34-10:59 11:07-11:57 12:01-12:18    
ch11  110/3mm Al  3mm Al+2mm Pb -           4mm Pb      - 
      2.93        2.58          3.05        2.42        3.02
ch12  120/1mm Pb  3mm Pb        -           4mm Pb      -
      3.04        2.64          3.15        2.52        3.13
ch13  212/-                                 210/-
      36.7e-3                               0.232
ch14  223/-                                 220/-
      8.09e-3                               0.249

At 10:32 aminogray 9602241/210 removed from PIN11X board at 10cm
Amplifier board exposed to 61.3kRad/h all the time,
for total 5+2+25+30+17=1h19m i.e. about 100kRad
ch11-12 always at 61.3kRad/h
ch13-14 at 61.3kRad/h until 10:59, then at 1.36kRad/h
second row are corresponding voltages in [V]

PIN gain changes
----------------

When amplifier chip is >1m away from the source (dose rates below 1kRad/h)
the gain change of the PIN system is small, 1-10% per MRad, depending on
the PIN current. Gain always decreases.

When Amp. board (with TL082CP operational amplifier) itself is exposed
to high radiation:
- noise and spikes largely increase
- gain change becomes either positive or negative
- it's magnitude can be up to 100% in one hour