Description: Excitation functions of natGe(p,xn)71,72,73,74As reactions up to 100 MeV with particular reference to the production of 72As for medical and 73As for environmental studies

This title appears in the Scientific Report : 2007

Excitation functions of natGe(p,xn)71,72,73,74As reactions up to 100 MeV with particular reference to the production of 72As for medical and 73As for environmental studies

Excitation functions for the formation of the arsenic radionuclides (71)As, (72)As, (73)As and (74)As in the interaction of protons with (nat)Ge were measured from the respective threshold energy up to 100 MeV. The conventional stacked-foil technique was used and the needed thin samples were prepare...

Personal Name(s):	Spahn, I.
	Steyn, G. F. / Nortier, M. F. / Coenen, H. H. / Qaim, S. M.
Contributing Institute:	Nuklearchemie; INB-4
Published in:	Applied radiation and isotopes, 65 (2007) S. 1057 - 1064
Imprint:	Amsterdam [u.a.] Elsevier Science 2007
Physical Description:	1057 - 1064
PubMed ID:	17574855
DOI:	10.1016/j.apradiso.2007.04.012
Document Type:	Journal Article
Research Program:	Funktion und Dysfunktion des Nervensystems
Series Title:	Applied Radiation and Isotopes 65
Subject (ZB):	Arsenic: chemistry Cyclotrons Environmental Monitoring Germanium: chemistry Isotopes: chemistry Radioisotopes: chemistry Radiopharmaceuticals: chemistry Isotopes Radioisotopes Radiopharmaceuticals Arsenic Germanium J As-71 (72)AS (73)AS As-74 excitation function integral yield model calculation
	Publikationsportal JuSER

Please use the identifier: http://dx.doi.org/10.1016/j.apradiso.2007.04.012 in citations.

Excitation functions for the formation of the arsenic radionuclides (71)As, (72)As, (73)As and (74)As in the interaction of protons with (nat)Ge were measured from the respective threshold energy up to 100 MeV. The conventional stacked-foil technique was used and the needed thin samples were prepared by sedimentation. Irradiations were done at three cyclotrons: CV 28 and injector of COSY at Forschungszentrum Jülich, and Separate Sector Cyclotron at iThemba LABS, Somerset West. The radioactivity was measured via high-resolution gamma-ray spectrometry. The measured cross section data were compared with the literature data as well as with the nuclear model calculations. In both cases, the results generally agree but there are discrepancies in some areas, the results of nuclear model calculation and some of the literature data being somewhat higher than our data. The integral yields of the four radionuclides were calculated from the measured excitation functions. The beta(+) emitting nuclide (72)As (T(1/2)=26.01 h) can be produced with reasonable radionuclidic purity ((71)As impurity: <10%) over the energy range E(p) = 18-->8 MeV; the yield of 93 MBq/microAh is, however, low. The radionuclide (73)As (T(1/2)=80.30 d), a potentially useful indicator in environmental studies, could be produced with good radionuclidic purity ((74)As impurity: <11%) over the energy range E(p) = 30 --> 18 MeV, provided, a decay time of about 60 days is allowed. Its yield would then correspond to 2.4 MBq/microAh, and GBq amounts could be produced when using a high current target.