Search for the radioactivity of 180mTa using an underground HPGe sandwich spectrometer.
The radioactivity of (180m)Ta has never been detected. The present attempt to detect it was carried out using a newly developed HPGe sandwich spectrometer installed 500m water equivalent underground in the HADES laboratory. The sample consisted of 6 discs of tantalum of natural isotopic composition with a total mass of 1500 g and a total mass for (180)Ta of 180 mg. The sample was measured for 68 days and the resulting lower bound for the half-life of (180m)Ta was 2.0 x 10(16)y, which is a factor of 2.8 higher than the previous highest value.
Hult
Mikael
M
European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel, Belgium. mikael.hult@ec.europa.eu
Wieslander
J S Elisabeth
JS
Marissens
Gerd
G
Gasparro
Joël
J
Wätjen
Uwe
U
Misiaszek
Marcin
M
D006207:Half-Life; D011851:Radioactivity; D013051:Spectrometry, Gamma / Q000379:methods*; D013635:Tantalum / Q000032:analysis*
D013635:Tantalum