The phrase "a research worker" is correct and usable in written English.
It can be used to refer to someone who is engaged in research activities, typically in a scientific or academic context.
Example: "The conference featured several presentations by a research worker who specializes in renewable energy technologies."
Alternatives: "a researcher" or "a research associate".
When a research worker gets on the side track of electronic physics, they tell him to go ahead.
In the fall of '29, Hardinge Scholle of the City Museum gave him a job as a research worker.
After graduating from Cambridge University in 1921, Blackett spent 10 years as a research worker in the Cavendish Laboratory.
He was a research worker at the Institute of Economics of the Czech Academy of Sciences in 1968 when he completed his Ph.D. in economics.
An expert panel convened by the World Health Organization called on all countries yesterday to stringently oversee laboratory safeguards, to prevent another escape of the SARS virus like the incident that infected a research worker in Singapore in August.
Realizing that improvements in optical instruments depended on advances in optical theory, in 1866 he engaged as a research worker Ernst Abbe, a physics and mathematics lecturer (later professor) at the University of Jena, who soon became Zeiss's partner.
Dr. W.J.C. Dyke, a biological research worker, read a paper at the conference in which he stated that the full possibilities of the discovery were as yet unknown.
Upon the consent was obtained, data collection was conducted by a trained research worker using a structured data form.
At the 5-year follow-up point, a trained research worker administered to each child the RCPM, a widely used age-adjusted nonverbal test of reasoning ability and intelligence based on figural materials or patterns (Raven et al. 1998).
He has always been known to us as a great research worker and scientist, whose labours earned him the Lister Medal, a man of exceptional integrity and industry and a persistent advocate of the value of tradition in its best sense".
