Government Employees Life Insurance Co. reported 3 percent lower operating income for the first nine months of this year than a year ago.

Earnings before investment gains or losses were $5.98 million ($1.34 a share), down from $6.1 million ($1.38) for the same period of 1978.

Sales of individual life insurance were $145.9 million, 16 percent above the $125.97 million sold a year earlier.

The company is an affiliate of Government Employees Insurance Co., which owns the majority of its stock.

Government Employes Life also reported an investment loss of $71,151 for the year so far compared with gains of $4,013 for the first nine months of 1978.

Planning Research Corp. reported profits of $1.66 million (24 cents a share) for the first quarter of the company's 1980 fiscal year, a 14 percent increase over rsults for the 1979 fiscal year.

Planning Research, an information and planning company based here, also reported first-quarter revenues of $61.8 million, up from $60.4 million reported last year.

The slight revenue increase was a result of the sale of two subsidiaries whose results were included in the 1979 figures, the company said.

International General Industries Inc. reported nine-month profits of $8.8 million ($4.99 a share), a 26.8 percent increase over the $6.96 million ($3.92) earned in the same period in 1978. Revenues of $83 million were 14.5 percent higher than 1978 nine-month revenues of $72.5 million.

Third-quarter profits for the company were -2.5 million ($1.42), up from $2.3 million ($1.32) in 1978. Revenues fell 2.4 percent to $24 million.

Radiation Systems Inc. announced profits of $666,000 (88 cents a share) for its fiscal year ending June 30 on sales of $5.7 million. The McLean company had proftis of $434,000 (61 cents) and sales of $3.5 million in the last fiscal year.

Equitable Bancorporation of Baltimore reported profits of $10.5 million (2.79 a share) for the first three quarters of 1979, up from $9.4 million ($2.49) last year. Third-quarter profits were $3.6 million (97 cents) compared to $3.4 million (92 cents).

NUS Corp. of Rockville reported a sharp decline in third-quarter profits to $443,000 (44 cents a share) from $707,000 (71 cents) in the 1978 third quarter.

The energy and environmental consulting company reported nine-month earnings of $994,000 (95 cents) compared with $1.9 million ($1.95) in 1978.

The company said the earnings loss could be attributed to "curtailed workloads available in the engineering design and environmental areas."