On 26 November 1933, Den Hoed is presented with the gold Wertheim Salomonson medal for his study on "The effect of hard X-rays and Gamma rays from radium".On the table, the box with 25 gold 10-guilder coins. Professor Van Ebbenhorst Tengbergen, president of the Dutch Society for Radiology, presents the medal to Daniël den Hoed.Photo Ned.Ver.v.Radiologie.
In 1934 Den Hoed completes his doctorate on research into the characteristics of hard X-rays and Gamma ray radiation from radium . In his dissertation, he explains extensively the dosimetry and radiobiology of the irradiation and its techniques. In 1935, he publishes an extensive article with a long reference list . He is the first radiologist in The Netherlands who graduates as radiation oncologist and will, up until his death in 1950, teach the next generation of specialist radiation oncologists. With his thesis, Den Hoed wins a prize awarded by the "Nederlandse Vereeniging voor Electrologie and Röntgenologie" (Dutch society for electrotherapy and radiology). This is the first time that the Wertheim Salomonson prize is presented.
The prize is established in honour of Professor Wertheim Salomonson, a descendant of the Almelo textile manufacturer Salomonson. The company Salomonson later merged with Ten Cate and from this developed the present day company Nijverdal Ten Cate. Johan Wertheim Salomonson however, studied medicine and became a pioneer in electrotherapy and radiology. He became the first professor of röntgenology in The Netherlands and he set up the Dutch Society for Electrotherapy and Radiology. He established international cooperation and in 1900 he organised the first international congress in Paris, in 1902 in Bern, in 1906 in Milan and in 1907 in Amsterdam. He was honorary member of the Dutch, French, German and English societies for radiology and was a member of the Royal Dutch Academy for Sciences. On the occasion of the 25th anniversary of the Society of Radiology in 1926 (2 years after his death), it was decided to establish a Wertheim Salomonson Fund. This WSF foundation was set up on 27 March 1926. The medal was designed by Begeer in Voorschoten. In 1931, a research competition for radiologists was announced. The winner would be presented with the first Wertheim Salomonson medal during festivities of the University of Amsterdam.Daniel den Hoed was proclaimed winner.
After Den Hoed, more radiation oncologists from the Netherlands Cancer Institute have been awarded the WSF prize; in 1940 Dr. Betje Levie for her research into the clinical possibilities of the contact therapy machine of Philips and in 1979 Dr. Jan J. Battermann, for his research into the clinical possibilities of neutron irradiation with the DT generator of Philips.