Recent content by GammaScanner

This place works for me: http://www.nndc.bnl.gov/sigma/index.jsp

Who do you believe? I'm doing some shielding calcs for Cs-137 (662 KeV gamma) in stainless steel (Fe seems close enough) with ux (mfp) in the range of 5 to 15. Shultis and Faw in Radiation Shielding (2000) treat Photon buildup pretty well. Their coefficients for the Berger...

Besides exhaust, when operated in an atmosphere, there's the problem of backscattered radiation (both gammas and neutrons) from the reactor reaching the payload/crew compartment. It's not just line of sight - radiation that escapes the reactor will scatter in any surrounding structure and...

Hadn't heard of these. All mine sort of fade out once they've been comptonized a bit and then photoelectronized. A particular spectrum of gamma rays? Photoneutron production maybe? Gamma rays produced by thermal sources? (not just really high energy x-rays) I've not thought of gamma...

Raw material is barium carbonate, BaCO3, 196g/mole hence the 1.2E20 atoms of Ba-132, which makes it even longer. 1.77E18 of Ba-133 is what I had. Cross section for Ba-132 is 9 barns which would give the 5 weeks (they run 6.5 days a week from what I understand), not counting the conversion of...

I don't think you need all that much energy for a car, and even a semi is only an order of magnitude greater. Safe bet that storage will always be easier than generation, though the lines tend to blur, (e.g., fuel cells, with fusion being a deuterium fuel cell). Isomer energy storage would...

That's the thing I love about this stuff - scientific notation. The equilibrium ratio 9 to 4, is way more to us, but when we're talking 1.2 10E20 atoms of Ba-132 (in 100 mg Barium carbonate enriched to 40%, natural Barium has only .1% atoms of Ba-132) that gets us to 2.7 10E20 which just...

Thanks! Good table. Cross sections for all the energies is a plus. Was looking at making some 100 mCi Ba-133 sources from enriched Ba-132 in reactor. But with Ba-132 at about 9 barns you don't make much, and with Ba-133 not much smaller at 4 barns, you lose a lot of the Ba-133 you do make...

Anybody have good values and a source for thermal neutron capture cross section for Ba-133, both ground and excited states? CRC Handbook gives 4 barns, but wanted to verify it. Thanks.

I recall several studies on accelerator driven transmutation of nuclear waste with net excess of power being generated. Here's one I could find from LANL in 1993. ABSTRACT: "A medium energy, high current proton beam strikes a heavy metal target, producing a high flux of spallation neutrons...