The introduction of trace amount (nT/nD<5%) of tritium into DD plasma provides a unique opportunity to study plasma effects as well as tritium transport under different conditions. Such kind of studies have been carried out at JET during DTE1 [1] and also successfully performed in the Trace Tritium Experimental campaign (TTE) in 2003 [2,3,4]. One of the main tools for these studies is the JET neutron diagnostics. A comprehensive range of JET neutron diagnostics was deployed for TTE. The total (2.5 and 14MeV) neutron emission from plasmas was determined using three pairs of fission chambers (U235 and U238). A set of silicon diodes, Chemical Vapour Deposited (CVD) and Natural diamond (NDD) detectors was used to measure the 14MeV neutron emission. The neutron emission profile monitor provided a simultaneous measurement of the line-integrated 2.5MeV and 14MeV neutron emissions, with temporal and spatial resolution. The absolute calibration of all detectors relied on a cross calibration with the neutron activation system.