Measurement of an isotope by gamma spectroscopy is much easier than alpha spectroscopy. For exploring the chemistry of Np you wish to use an isotope the can be identified by its gamma decay energy. Your gamma detector has suitable sensitivity from 60 keV to 950 keV, with a maximum gamma efficiency that peaks around 185 kev. The experiment is an ion exchange of Np study that takes between 5 and 8 hours to perform. The Np isotope used should have a suitable gamma decay energy, half-life and a decay yield for the gamma energy greater that 10 %, and a relatively high specific activity. The suitable Np isotope is the progeny from an alpha decay. SF 3 y 44.5. SF vo 21E2 El 70E2 Am2375/(-) Am238 1+ Am239 (5) Am240 (3- 1.22 h 1.63 h 11.9 h 2.12 d E E Y 280.2. B+ y 277.6, 228.2, 987.7.888.8 a 6.04 y 962.8, 918.7. 561.0, a 5.774(6), 5.734.25.378 , 749.3 5.94 vo E 1.5 E 2.3 E 0.802 E 1.38 Pu236 Pu2377- Pu238 Pu239 17+ 2.87 a 0.18 s 45.64 d 87.7 a 2.410E4 a a 5.7675, 5.7209,IT 145.54 4. 59.5.- a 5.4992, 5.4565, 5.156, 5.144, 5.105.- 47.6-643.7 a 5 344) 43.5 (0) 51.6 - 30.1 - 1057 30 280.4(vol. 289.9 99.9 (0) G416E1, 1E3 SF ve 271, 2011 320.8. 5, 54E1, 2011 750, 30E1 da