Conveter setup before 22-Na source is installed
Turbo pump is outside of radiation screening
Pre-pump is heavy duty - but very loud
Begin of cable tunnel in cave 111b
Electron beam line to positron converter
Electron beam line in Cave 111b
Beam line to positron converter
The complete positron setup in cave 111b
Ge detector for positron detection arrives
Wolfgang installes the Doppler spectrometer for positron detection
Ge detector in action
A video camera shows the position of the source relative to the entrance window of the electrostatic lense
Before source installation
Mrs. Naumann is head of radiation sefety of FZD
before installation of real source - test run with dummy source
RKR and Wolfgang testing the source transfer
mounting to the source flange
Installation of moderator
putting flange into position in the vacuum vessel
closing flange - still with dummy source
test of lead wall closing
dummy source on holder
dummy source having the moderator mounted
The real source (10 mCi) arriving in 238-U container
open source container, source still inside
source comes out...
source is mounted to the flange
source capsule is fixed by a small screw from the side
source at flange
moderator is fixed
flange in position
when closing the flange, the position must be monitered on the video screen
video system
closing the lead screening
last bricks put in by Nicki
screening almost complete
measurement of of dose rate outside the screening is okay
done
Ge detector waiting for 511 keV
restricted area
the heros ...