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I think you are right. Obviously you are thinking about them experimenting with special treated materials that eventually could be used in parts to make gas centrifuges, interior piping, baffles, special valve assemblies. All the things that go into building cascade/serial gas centrifuges to create highly enriched uranium from HF₆ gas.
As far as the neutron generators. Yea. Could simply been a small unit that contains any number of different isotopes that can be used to create either alpha, beta, gamma radiation for many applications which of course can include commercial uses such as irridating say seed stock, kill bacteria, a plethora of could be peacefull intended uses, including nuclear medical research, but at the same time could be used in things they where not to be fiddling around with.

And this from the Iraq Survey Group that talks about Hidden Uranium Enrichment Technology that use Graphite and Tantalum http://www.cia.gov/cia/reports/iraq_wmd_2004/chap4.html

"Hidden Enrichment Technology

Since Operation Iraqi Freedom, two scientists from Iraq’s pre-1991 nuclear weapons program have emerged to provide ISG with uranium enrichment technology and components, which they kept hidden from inspectors. In August 2003, a former EMIS scientist told ISG during an interview that he had taken material and equipment that was related to EMIS and hid them in various places near his home in the 1990s. The scientist had not been specifically told to do this but believed his supervisors were cognizant of his actions. He chose items to hide that could be used in future reconstitution of the EMIS program. The scientist turned over to the Coalition a broad range of items that had been withheld from the UN inspectors, including technical reports on EMIS, a collection of foreign EMIS-related patents, a mass spectrometer, blocks of high-purity graphite, high-purity tantalum shielding sheets, and an indigenously designed collector piece from inside the EMIS machine.Some of these items are shown in Figure 34."