With deep roots in the heart of Silicon Valley, RDC has provided radiation dosimetry services to the medical service and other industries since 1949. Dr. Francis R. Holden, founder, was a Certified Health Physicist and Certified Industrial Hygienist with a doctoral degree in chemistry. Partnering with three other medical and health physics professionals, they co-founded the Industrial Health and Hygiene Association in San Francisco. Dr. Holden, an entrepreneur, worked at the Naval Radiological Defense Lab and Stanford Research Institute until the dosimetry start-up business could sustain itself. In the early 1950s, the company name was changed to Radiation Detection Company (RDC) and relocated to Palo Alto, California. 

Dr. Holden's son, Richard (Dick), worked with his father following a short professional baseball career. Dick learned the dosimetry business and observed his father's ethics and values displayed time and again in his dealings with customers. Customers were respected and dealt with honestly. Employees became long-time "partners" rather than simply "resources." Today a considerable number of employees have been with the company more than 25 years, including a number of second and third generation employees from the same families.

Dick graduated from San Jose State University with a degree in Business Management. After Dr. Holden's untimely death in 1966, Dick became President and worked with a management team to further develop the business. RDC continued to grow and expand and moved to Sunnyvale, California around 1970.

In the early 1980's RDC established what was to become a long-term relationship with a team of legal and management professionals who give continuity and counsel necessary to continued business development in the complex modern business climate. One of those team members, Barrie Laing, served as General Counsel from 1983 to 1996, when he became President and General Counsel of RDC. Dick Holden remains as Chairman and oversees the marketing and sales efforts of the company.

Continued growth during the decade of the 90's once again made it necessary to expand the company facilities and RDC moved to Gilroy, California in 2001.

RDC's management team is passionate about the company's core values of honesty, integrity, customer loyalty and financial stewardship. It is this company's philosophy that "to whom much is given, much is required." Consequently, RDC is a strong supporter of organizations and educational institutions that reach out with love and compassion to those who are in need in RDC's own community and around the world. RDC's commitment to the care of employees and customers lies at the heart and soul of the organization.