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  • Spills can easily happen

  • When a spill does happen there

  • Are certain things you need to do

  • First you need to make sure you

  • Notify everybody in the lab and

  • You restrict the access

  • Anybody that doesn't need to be there

  • Should stay away

  • You need to soak up any free-standing

  • Liquid right away so it doesn't have a

  • Chance to soak in and cause a more

  • Difficult problem for cleaning up

  • So we're putting paper towels down to soak it up

  • We're also going to get some plastic bags and

  • Use them as shoe covers

  • This is verys simple and very effective

  • You don't want to track material around but you

  • Definitely don't want to get it on the bottom of your own shoes

  • So this way if we get contamination on the

  • Bottom of the shoes it won't be on the shoes

  • It'll be on the plastic bag

  • Then we put all that soaked up liquid and the

  • Paper towels into the combustable

  • Radioactive waste container or in a plastic bag

  • That we're going to label as combustable

  • Radioactive waste later

  • Take up the absorbant paper that got contaminated

  • And put that in the combustable waste

  • Continually check your hands to make sure they're not contaminated

  • If there is contamination on the gloves

  • Change the gloves and keep working

  • Outline the spill area

  • Here we're looking on the floor

  • Finding out where the area of contamination is

  • And marking it off so we know how to work

  • We're going to clean from the outside towards the inside

  • So we're gonna gather cleaning supplies

  • Paper towels and a soapy solution like Alconox

  • Wet the area down with it take a paper towel and

  • Clean from the outside-in

  • Only a small area and we'll check that to see if

  • We're getting contamination up

  • And keep cleaning until no more contamination

  • Comes up on the paper towel

  • You can check that with the meter

  • And again frequently check your hands so

  • We don't spread contamination inadvertently

  • Survey the area with the meter

  • Slowly again - 2 inches per second

  • And then we'll check for removable contamination

  • By checking with a wipe

  • Take a wipe and count that in a

  • Liquid scintillation counter or provide

  • It to somebody with a liquid scintillation counter

  • To count

  • Checking the areas and again frequently checking the gloves

  • So it's a slow process

  • You clean a little bit, you verify that stuff is coming up

  • And you do it again

  • Then once it's clean and no more material is coming up

  • Then you go to the next area

  • Here we're looking at the bench-top now

  • Doing the same process, cleaning small area

  • Verifying with the meter whether or not

  • Material is coming up

  • If it's hot do it again

  • It may be that some areas may need a little bit of

  • An abrasive cleaner like Commet or something

  • And that's fine too

  • Wet down a towel and rub over the area

  • See if we can get anything up that way

  • Just make sure you take your time

  • Make sure you do a good job cleaning

  • Again frequently check to see if

  • Contamination is coming up

  • If no more contamination comes up then

  • You go to the next area

  • Once we think we've got it all cleaned

  • We can check with the meter

  • It may read nothing, the background

  • Or if there may be a hot spot still there

  • Nothing's coming up so we'll take a wipe

  • And make sure that nothing is coming up

  • By counting it in a liquid scintillation counter

  • Occasionally you'll have a situation where

  • There'll be fixed contamination in a crack

  • And it won't come up and we can deal with that

  • Just let EH&S know what the results are

  • And we can deal with it

  • Continue to survey the whole spill area

  • There may be other areas that you didn't

  • Realize got contaminated

  • There may be a few drops down the front

  • Of the cabinet or on the handle

  • If you find a new area of contamination

  • Clean it up the same way and re-survey

  • When you're finally done your shoe covers

  • And gloves also need to go into the

  • Combustable radioactive waste container

  • And then you need to survey yourself afterwards

  • To make sure that you didn't get any contamination

  • On yourself while you were doing this job

  • Again you need to force yourself to go

  • Fairly slowly, 2 inches per second is about the

  • Fastest you should go

  • It's very difficult to go that slow

  • Especially if you're excited so force

  • Yourself to slow down

  • And then record the results

  • In this case the background was 30 and we found 110

  • So that's contamination, that's more than twice background

  • Twice background would be 60

  • And that was the initial reading

  • So now we're doing final surveys and if we did

  • A good job it'll be back down to background

  • In this case 35, that's less than twice background

  • So it's cleaned up and we documented it

Spills can easily happen

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B1 中級

流出物の処理(物質使用者のための放射線安全性 (Cleaning Up a Spill (Radiation Safety for Material Users))

  • 34 2
    kuoyumei に公開 2021 年 01 月 14 日
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