Abstract
Since the neutrino was introduced by Pauli in 1933 to filful the energy-mementum conservation in the neuclear β-decay, a finite mass of the neutrino plays an important role in elementary-particle physics and cosmology. The Langmuir-Blodgett film is expected to be an excellent 3H-source for the measurement of the electron anti-neutrino mass because it is homogeneous in the lateral directions and uniform in thickness.
In this review, the preparation of a high radioactive, uniform, and stable LB film of Cd-3H -arachidate was introduced as a tritium source for the measurement of the electron anti-neutrino mass;a new method was also presented for preparing a LB film of 109Cd-arachidate as a standard source for the measurement. The method requires an extremely small amount of substrate solution.
