The coefficients a, were found by solution of the simultaneous equations: 8.8. N tk . ™, 1" where 8, -= “>” measured areas. o 1 a B85 + 8,4, + B58) = mM, . N k Yn» and Nis the number of 24 tn ‘The details are not shown here but the results are as follows: For He703; y = 1.3022 - 0,0154t, For Na@*: y = 0.4336 - O,0014t, Areas were computed from the equations for each day that spectra were made and compared with the measured areas. The average deviation for Nae was 0,03 in“ 2 203 and for Hg was 0.106 in’, The average percentage deviation was 2.0 per-— cent for Ne@2 end 5.4 percent for Hge05, The probable reason for the higher deviation for Hg@°5 is a combination of fewer records, shorter half life (requiring progressively more sensitive count-rate scales with consequent loss in statistical accuracy during the latter part of the recording period) and higher amplifier gain requiring the use of more sensitive count-rate scales to provide peaks of adequate height. 32 ae ae