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 ...