hey bruiser,
No need for 2 accu in your attacks. 1 is enough for pve normally. Especially since your rad/ attacks all have secondary -def and even some bypassing of defense. Not to mention the excellent def debuff from RI.
-RI needs 3 -to hit debuff and 1 or 2 def debuff and preferably 1 endredux.
-AM slot earlier for endmod
-LR just asks for 2, 3 recharge
-Snipe will be much more usefull mid combat when you put in 1 or 2 interupt redux
-AIM is a redundant since you have high accu in the form of the secondary -def all around. And with around 20% the dam buff isn't that much tbh
-EMP would be better with 2 recharge instead of endmod. Endrain is not that hot in pve since mobs don't need much end to keep fighting full out. They seem to have a natural uber recovery and very low endusage of their powers anyway. Having up the best AoE hold in the game more often is far more usefull.
-cj swap def buf for end redux. the base def is so low the enhance does almost nothing.
-sj one jump will do. make it 2 if you really wanna jump further then the rest- but the slots can better be spend elsewhere
-health isn't that much use seeing your regen has low base value. If you want it over swift- which gives you better combat maneuvrability- you could just use the base slot and the other 2 somewhere else.
Enjoy! 
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No need for 2 accu in your attacks. 1 is enough for pve normally. Especially since your rad/ attacks all have secondary -def and even some bypassing of defense. Not to mention the excellent def debuff from RI.
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It depends on what sort of level you tend to fight, but I have to disagree here. If you fight mostly on the lowest difficulty, sure, one acc is fine, but if you're going to be fighting +3s or more, I always find that one just doesn't cut it. Even on my Rad Blast or Rad Emission toons - you get to get some first hits for that -def to kick in, and you won't always have Rad Infection running on every mob you try to attack. I find this is especially important in CoV, where you end up fighting a lot of high-def mobs like Night Widows, etc. Obviously, if you find you're really not annoyed by only one acc, go for it... but it drives me up the wall missing that much, especially in important powers like Lingering Rad.
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-cj swap def buf for end redux. the base def is so low the enhance does almost nothing.
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The end cost is also so low as to be almost meaningless. I usually go with a jump enhancement, but it doesn't matter much whatever you put in it.
Other than that, looking at the original build...
I wouldn't bother slotting Health. It's not great on low-HP characters, and you have a self-heal anyway. You could even take the slots and put them straight into the heal instead - it'll be more useful to you and any teams you're on. Two more recharges or a recharge and end reduction would help it.
Cosmic Burst is an awesome attack, and you might want to find a slot to put a recharge in it.
Lingering Rad could certainly do with recharges - you might not use it a lot in normal missions, but against AVs/Heroes (and there are a lot in CoV), it's one of your best tools.
Atomic Blast shouldn't need accuracies. Level 32 Corruptor and Blaster powers inherently have very high accuracy, and you can always fire off Aim before it, if you have it. Go for 3 dam, and as many recharges as you want or can afford.
I think Blue Note already noted Radiation Infection should be three tohit debuffs - that's really the vital part. I usually then go for an end reduction, and a def debuff or two if I can find the slots, which generally isn't easy on a Rad.
Irradiate is an awesome AoE attack with a big def debuff. Think about switching something for it, at least to try it - it's the attack I use most on my Rad/Thermal. At lower levels, I found it pulled in too much aggro, but at higher levels, it's great. I ended up dropping the snipe entirely to make space in my build for other powers, because I found it just wasn't that useful - most CoV teams seem to be centered around charging straight in, which suits me, and it's not great to use mid-combat. I think it'd be more useful solo, mind you, so it depends what you're planning on doing. Rads are great in teams, though.
Keep in mind that your Patron pet is not going to be up very often without recharges.
One place you could maybe find some slots for some of these suggestions is Super Jump. It's a matter of personal preference, but I never bother slotting it past the one that comes with it. It's already quick (especially with Hurdle, which you have), and there are places those slots could be that would help you in combat. The tohit buff in Soul Drain is probably expendable, too, if it needs to be somewhere more important.
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01) --> Neutrino Bolt==> Acc(1) Acc(3) Dmg(7) Dmg(11) Dmg(15)
01) --> Radiant Aura==> Heal(1) Heal(5) Heal(5) Rechg(40)
02) --> X-Ray Beam==> Acc(2) Acc(3) Dmg(9) Dmg(13) Dmg(19)
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Don't get both x-ray beam and neutrino bolt - they really don't chain well. I'd go for Irradiate instead of x-ray beam
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04) --> Accelerate Metabolism==> Rechg(4) Rechg(36) Rechg(36) EndMod(37) EndMod(37) EndMod(37)
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Fully slot this as soon as you can, it makes a huge difference.
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06) --> Electron Haze==> Acc(6) Acc(7) Dmg(9) Dmg(13) Dmg(23)
08) --> Hurdle==> Jump(8)
10) --> Radiation Infection==> DefDeBuf(10) DefDeBuf(11)
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RI needs - tohit debuff at least.
Any AoE attacks you take (Irradiatem electron haze, neutron bomb) could do with an end reducer.
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12) --> Combat Jumping==> DefBuf(12)
14) --> Super Jump==> Jump(14) Jump(15) Jump(43)
16) --> Health==> Heal(16) Heal(17) Heal(17)
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All those slots are wasted - you have a self heal and the extra jump in SJ won't give you any benefit in PvE.
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18) --> Cosmic Burst==> Acc(18) Acc(19) Dmg(23) Dmg(45) Dmg(45)
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Maybe the best attack you have, give it a recharge enhancer too!
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20) --> Stamina==> EndMod(20) EndMod(21) EndMod(21)
22) --> Enervating Field==> EndRdx(22) EndRdx(29)
24) --> Lingering Radiation==> Acc(24) Acc(25) Slow(25)
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Enervating field has a huge end cost so it could benefit from another end redux.
LR is great with 2 acc 3 recharge.
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26) --> Aim==> Rechg(26) Rechg(27) Rechg(27)
28) --> Proton Volley==> Acc(28) Acc(29) Dmg(31) Dmg(34) Dmg(36)
30) --> Hasten==> Rechg(30) Rechg(31) Rechg(31)
32) --> Atomic Blast==> Acc(32) Acc(33) Dmg(33) Dmg(33) Dmg(34) Rechg(34)
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Not sure I'd take proton volley in a PvE build - you'll be starting the fights with radiation infection (I hope) then stuck in the thick of the action firing off your AoEs.
A good tip if you want to use atomic blast a lot: slot it 3 damage 3 recharge. Every time you want to use it just pop Aim first.
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35) --> Recall Friend==> IntRdx(35)
38) --> EM Pulse==> Acc(38) Acc(39) Hold(39) Hold(39) EndMod(40) EndMod(40)
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Endmod in EMP is a waste of time unless you're going for PvP
IN MEMORIUM OF GAYBABY
CRUELY TAKEN FROM THIS WORLD WHILE SO YOUNG
Overlooked there was no Irradiate in that! You could drop snipe or X -beam for that indeed. More value for your money.
And as Irradiator suggested, a recharge in cosmic burst works nicely.
Fighting higher then +3 doesn't happen that often if you're not PL'ing. This you can play pretty well with just 1 accu, you won't miss that much. Especially if you're keeping AIM and with having all that -def. That said a crucial power like LR could do with a 2nd accu.
The right timing and targetting of powers is the key though and provided when good at that you can use the big -def from RI most of times to your advantage supported by the -def from your attacks also when playing high lvl mobs. Ofcourse you can put in 2 accu in your attacks, but imo those slots in general can be better spend elsewhere for PvE.
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Fighting higher then +3 doesn't happen that often if you're not PL'ing.
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This is exactly why I brought up that it matters what level you tend to fight. 
That might be true for you, but some people end up doing big teams on the highest difficulty a lot, and it's pretty common to end up with people SKed up or who are a level or two down. I know on my SG teams we quite often end up with some members fighting +4s and even +5s. Without a second acc, they're just painful, especially when you hit high def mobs, or AVs.
I've found it to be one of those things that I just can't go back from since I first started slotting two acc. The difference is too noticeable for me, and now I'm used to hitting this much, one acc just feels really weak. I tend to six-slot attacks regardless, though, so it hardly uses up slots for me - I'd just rather have the extra acc than a recharge or end cost.
Gotcha cyber 
Well i think it is true for most people that you don't often play higher then +3. And i assumed an average player building a toon and posting here for advice is one of those not doing many PL sessions with their SG. For normal playing 1 accu on a rad/rad will do for sure except as said crucial powers like LR.
Ofcourse if you know you'll be PL'ing much and fight +5 a lot then a 2nd accu will do nicely indeed. But that's for ppl who have set their mind on that and still feel they wanna contribute to a team. Although in my opinion if fighting +5 or higher this just makes you more of a liability to the team and your attacks can't contribute as much to the team in regards to your potential and you better get a lackey or get lost anyway.
Besides i happily play high lvl mobs +4 ish quite a lot on my toons with not much hassle on 1 accu. With good use of those cute yellow insp even the non rads do pretty well, let alone a rad/rad.
In the end it all comes down to preference ofcourse. You like 2 accu in your attacks cyber and that's cool , i've been there too -and having a natural troller and domi fetish i still slot those primaries with 2 accu indeed- untill i found out in my f(l)avour that generally the slots could be put to better use elsewhere.
It's like The Voice sang: "I did it my way" And that's all cool to me 
Ok so i have just made this PvE build for a Rad / Rad Corr, i havnt really played one properly before, i had an energy / kin awhile ago but deleted it, :S ( stupid me)
Anyways here it is, please could i have some advice, it will be for kickin [censored] in PvE!! ( I Hope)
Name: Dark Radiation
Level: 50
Archetype: Corruptor
Primary: Radiation Blast
Secondary: Radiation Emission
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01) --> Neutrino Bolt==> Acc(1) Acc(3) Dmg(7) Dmg(11) Dmg(15)
01) --> Radiant Aura==> Heal(1) Heal(5) Heal(5) Rechg(40)
02) --> X-Ray Beam==> Acc(2) Acc(3) Dmg(9) Dmg(13) Dmg(19)
04) --> Accelerate Metabolism==> Rechg(4) Rechg(36) Rechg(36) EndMod(37) EndMod(37) EndMod(37)
06) --> Electron Haze==> Acc(6) Acc(7) Dmg(9) Dmg(13) Dmg(23)
08) --> Hurdle==> Jump(8)
10) --> Radiation Infection==> DefDeBuf(10) DefDeBuf(11)
12) --> Combat Jumping==> DefBuf(12)
14) --> Super Jump==> Jump(14) Jump(15) Jump(43)
16) --> Health==> Heal(16) Heal(17) Heal(17)
18) --> Cosmic Burst==> Acc(18) Acc(19) Dmg(23) Dmg(45) Dmg(45)
20) --> Stamina==> EndMod(20) EndMod(21) EndMod(21)
22) --> Enervating Field==> EndRdx(22) EndRdx(29)
24) --> Lingering Radiation==> Acc(24) Acc(25) Slow(25)
26) --> Aim==> Rechg(26) Rechg(27) Rechg(27)
28) --> Proton Volley==> Acc(28) Acc(29) Dmg(31) Dmg(34) Dmg(36)
30) --> Hasten==> Rechg(30) Rechg(31) Rechg(31)
32) --> Atomic Blast==> Acc(32) Acc(33) Dmg(33) Dmg(33) Dmg(34) Rechg(34)
35) --> Recall Friend==> IntRdx(35)
38) --> EM Pulse==> Acc(38) Acc(39) Hold(39) Hold(39) EndMod(40) EndMod(40)
41) --> Soul Drain==> Acc(41) Acc(42) Rechg(42) Rechg(42) Rechg(43) TH_Buf(43)
44) --> Soul Storm==> Acc(44) Acc(45) Dmg(46) Dmg(46) Dmg(46)
47) --> Summon Mistress==> Acc(47) Acc(48) Dmg(48) Dmg(48) Dmg(50)
49) --> Dark Embrace==> DmgRes(49) DmgRes(50) DmgRes(50)
---------------------------------------------
01) --> Sprint==> Empty(1)
01) --> Brawl==> Empty(1)
02) --> Rest==> Empty(2)
01) --> Scourge==> Empty(1)
---------------------------------------------