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Irradiation of nitrogen with protons leads to  11 C ( T  1/2 =20.4min)  via  the well-known  14 N( p , α ) reaction. However,  14 O ( T  1/2 =70.6s) and  13 N ( T  1/2 =10min) are also formed as side products  via  the  14 N( p , n ) and  14 N( p , d + pn ) reactions, respectively. In this work detailed cross section measurements were carried out for those two side reactions up to 19.2MeV using N 2  gas and nitrogen-containing solid targets. From the data, the thick-target yields and the exact level of radioactive impurities in  11 C were calculated. In the case of  14 O, the results also confirmed the possibility of producing this  β  +  emitting radionuclide in sufficient quantities for PET investigations.

Cross section measurements using gas and solid targets for production of the positron-emitting radionuclide O-14