Measurements of the endpoint region of the tritium β–decay spectrum provides good possibility to determine neutrino mass. This, however, needs a perfect monitoring of the spectrometer energy scale. A parallel measurement of electron line of known energy – in particular the 83m Kr conversion K-line – may serve well to this purpose. The 83 Rb decaying to 83m Kr seems to be a very suitable radioac...

Testing of Limited Streamer Tubes (LSTs) has been conducted on the first set of LSTs meant for installation in the BABAR detector. The tubes are kept under high voltage (between 5 and 6 KV) as often as possible to ensure their durability. Three tests were conducted: signal charge, leak and radioactive source. Testing is conducted to ensure that no damage occurred during transport of the LSTs fr...