"I simulated the X-ray spectra that would be expected for Van Assche's initial estimates of the Noddacks' residue compositions. ...Over the next couple of years, we refined our reconstruction of their analytical methods and performed more sophisticated simulations. The agreement between simulated and reported spectra improved further. "
Armstrong, John T. (February 2003). "Technetium". Chemical & Engineering News. 81 (36): 110. doi:10.1021/cen-v081n036.p110.
Kenna, B. T.; Kuroda, P. K. (December 1961). "Isolation of naturally occurring technetium". Journal of Inorganic and Nuclear Chemistry. 23 (1–2): 142–144. doi:10.1016/0022-1902(61)80098-5.
By reanalysing the original experimental conditions, we conclude that the detection limit for their observing the X-rays of Z = 43 can be 1000 times lower than the 10−9 detection limit for the element Z = 75.
Pieter H. M. Van Assche (4 April 1988). "The ignored discovery of the element-Z=43". Nuclear Physics A. 480 (2): 205–214. Bibcode:1988NuPhA.480..205V. doi:10.1016/0375-9474(88)90393-4.
"I simulated the X-ray spectra that would be expected for Van Assche's initial estimates of the Noddacks' residue compositions. ...Over the next couple of years, we refined our reconstruction of their analytical methods and performed more sophisticated simulations. The agreement between simulated and reported spectra improved further. "
Armstrong, John T. (February 2003). "Technetium". Chemical & Engineering News. 81 (36): 110. doi:10.1021/cen-v081n036.p110.
Abstract: A careful study of the history of the element 43 covering a period of 63 years since 1925 reveals that there is no reason for believing the Noddacks and Berg have discovered element 43.P. K. Kuroda (16 October 1989). "A Note on the Discovery of Technetium". Nuclear Physics A. 503 (1): 178–182. Bibcode:1989NuPhA.503..178K. doi:10.1016/0375-9474(89)90260-1.
Masataka Ogawa's discovery of nipponium was accepted once in the periodic table of chemical elements as the element 43, but disappeared later. However, nipponium clearly shows characteristics of rhenium (Z=75) by inspection of his papers from the modern chemical viewpoints...a record of X-ray spectrum of Ogawa's nipponium sample from thorianite was contained in a photographic plate reserved by his family. The spectrum was read and indicated the absence of the element 43 and the presence of the element 75H. K. Yoshihara (31 August 2004). "Discovery of a new element 'nipponium': re-evaluation of pioneering works of Masataka Ogawa and his son Eijiro Ogawa". Spectrochimica Acta Part B: Atomic Spectroscopy. 59 (8): 1305–1310. Bibcode:2004AcSpe..59.1305Y. doi:10.1016/j.sab.2003.12.027.
By reanalysing the original experimental conditions, we conclude that the detection limit for their observing the X-rays of Z = 43 can be 1000 times lower than the 10−9 detection limit for the element Z = 75.
Pieter H. M. Van Assche (4 April 1988). "The ignored discovery of the element-Z=43". Nuclear Physics A. 480 (2): 205–214. Bibcode:1988NuPhA.480..205V. doi:10.1016/0375-9474(88)90393-4.
Abstract: A careful study of the history of the element 43 covering a period of 63 years since 1925 reveals that there is no reason for believing the Noddacks and Berg have discovered element 43.P. K. Kuroda (16 October 1989). "A Note on the Discovery of Technetium". Nuclear Physics A. 503 (1): 178–182. Bibcode:1989NuPhA.503..178K. doi:10.1016/0375-9474(89)90260-1.
Masataka Ogawa's discovery of nipponium was accepted once in the periodic table of chemical elements as the element 43, but disappeared later. However, nipponium clearly shows characteristics of rhenium (Z=75) by inspection of his papers from the modern chemical viewpoints...a record of X-ray spectrum of Ogawa's nipponium sample from thorianite was contained in a photographic plate reserved by his family. The spectrum was read and indicated the absence of the element 43 and the presence of the element 75H. K. Yoshihara (31 August 2004). "Discovery of a new element 'nipponium': re-evaluation of pioneering works of Masataka Ogawa and his son Eijiro Ogawa". Spectrochimica Acta Part B: Atomic Spectroscopy. 59 (8): 1305–1310. Bibcode:2004AcSpe..59.1305Y. doi:10.1016/j.sab.2003.12.027.
"Tacke, Ida Eva". University of Alabama Astronomy Program. Retrieved 2013-03-11.
vanderkrogt.net
elements.vanderkrogt.net
Element 75 was isolated in 1908 by the Japanese chemist Masataka Ogawa and named nipponium. He inadequately assigned it[clarification needed] as element 43 (technetium). From the modern chemical viewpoint it has to be considered to be element 75. Peter van der Krogt. "75 Rhenium". Elementymology & Elements Multidict. Retrieved 2007-04-03.
