Your slotting is a bit all over the place. Consider what you want a power to do and focus on that, up to 3 slots. For example, damaging powers (stuff like cosmic burst) should have 3 damage and at least 1 accuracyl; you can get away with 1 acc in your attacks pretty much all the way up to 50 unless you PvP but make sure Radiation Infection is slotted 3tohit debuff, 2 def debuff, 1 end(optional). Any extra slots in attacks are usually used as endredux. Cosmic burst is a special case since it's disorient is really good but the range you have in there is a waste.
Suggestions :
6 slot AM, it's awesome. 3 recharge, 3 endmod.
3 slot stamina!
If you like AoEs get irradiate, it does more hurting than neutron bomb and it's damage over time so good for scourge.
Lingering radiation is a great power, 3 recharge and 1 accuracy as a minimum.
Choking cloud is a bit pants without the full 6 slots (3 end, 3 hold) and it's still not great with them either. Either take it and fully slot it or leave it out.
Personally, I find that neutrino bolt and x-ray beam don't chain well together. If you respec, pick one and leave the other out.
IN MEMORIUM OF GAYBABY
CRUELY TAKEN FROM THIS WORLD WHILE SO YOUNG
Yeah, thought my slotting was a bit odd. Never really got a character past late 20s (heavy alt-itis), so I've never had to worry about it much. I think my Rad/Rad might be my first character to 50 
Wasn't sure about choking cloud - definitely going to drop it now.
The main reason I went with disorient rather than damage on Cosmic Burst is that I find it useful soloing - chuck Enervating Field and Radiation Infection on the lieutenants, disorient them and then get rid of the dross surrounding them.
I'll go back to the drawing board and see if I can nail down something more focused.
Thanks for the tips/info!
Hi all
I've been playing my Rad/Rad Corr for a while now, having loads of fun in groups and solo. Thought I'd best start thinking about my build for the future. Currently at level 22 - any thoughts/ideas appreciated!
Level: 41
Archetype: Corruptor
Primary: Radiation Blast
Secondary: Radiation Emission
---------------------------------------------
01) --> X-Ray Beam==> EndRdx(1) Dmg(3) Acc(5) Dmg(7) Dmg(13)
01) --> Radiant Aura==> Rechg(1) Heal(11) Rechg(13) Heal(17) Heal(21)
02) --> Neutrino Bolt==> EndRdx(2) Dmg(3) Rechg(5) Dmg(9) Dmg(15)
04) --> Accelerate Metabolism==> Rechg(4) Rechg(11) EndMod(33)
06) --> Air Superiority==> EndRdx(6) Dmg(7) Dmg(17) Dmg(36)
08) --> Radiation Infection==> EndRdx(8) Rechg(9) TH_DeBuf(15) TH_DeBuf(37)
10) --> Swift==> Fly(10)
12) --> Hover==> Acc(12) DefBuf(23) Fly(34)
14) --> Fly==> Fly(14) Fly(29) Fly(34)
16) --> Health==> Heal(16)
18) --> Cosmic Burst==> EndRdx(18) DisDur(19) Acc(19) Dmg(25) DisDur(33) Range(34)
20) --> Stamina==> EndMod(20) EndMod(21)
22) --> Enervating Field==> EndRdx(22) EndRdx(23)
24) --> Proton Volley==> EndRdx(24) Acc(25) Dmg(27) Dmg(36) Dmg(40)
26) --> Lingering Radiation==> EndRdx(26) Slow(27) EndRdx(37)
28) --> Choking Cloud==> EndRdx(28) Hold(29) EndRdx(33)
30) --> Neutron Bomb==> EndRdx(30) Acc(31) DefDeBuf(31) Dmg(31) Dmg(37)
32) --> Mutation==> Rechg(32)
35) --> Assault==> EndRdx(35) EndRdx(36)
38) --> Atomic Blast==> Acc(38) Acc(39) Dmg(39) Dmg(39) DefDeBuf(40) DefDeBuf(40)