function dhe3c = dhe3Correction(dhe3u,TRIT,S,dt,He4ccSTPg)

% function to correct dHe3 for decay in copper tube.
% USAGE: dhe3c = Correctdhe3(dhe3u,TRIT,S,dT,He4ccSTPg)

% Samar Khatiwala (spk@ldeo.columbia.edu)

l = 0.05575;
Ra = 1.384e-6; % atmospheric 3/4 ratio
He4ccSTPgfw=He4ccSTPg./(1-S/1000);
dhe3c = dhe3u - 100*(2.49e-15)*TRIT.*(1-exp(-l*dt))./(He4ccSTPgfw*Ra);
