Re: 回覆： Re: [ RadSafe ] Disposal via Decay in Storage

[Khalid Aleissa]

Exactly .... this is my point too ... Waiting more than 7 half-lives will 
reduce the activity to less than 1% but what would be the exempted level for 
example for Tc99m to discard.

Khalid

----- Original Message ----- 
From: "Leung Kim Cheung" <lrccrm at yahoo.com.hk>
To: "RADSAFE List" <radsafe at radlab.nl>
Sent: Saturday, November 12, 2005 4:36 AM
Subject: 回覆： Re: [ RadSafe ] Disposal via Decay in Storage


> This question is always in my mind that if time is the only one parameter 
> we considered, then how about a large quantitiy of Tc99m? 1mCi and 100mCi 
> Tc99m decay to different activity after 1 weeks.
>
> Samuel Leung
>
> John Jacobus <crispy_bird at yahoo.com> 說：
> Khalid,
> Just wait a week and it decays away.
>
> --- Khalid Aleissa wrote:
>
>> I believe that the question still is not answered
>> ... how we get rid of
>> Tc-99m ...
>>
>> Khalid
>> ----- Original Message ----- 
>> From: "Baratta, Edmond J"
>> To: "'Cary Renquist'" ;
>> "RADSAFE List"
>>
>> Sent: Thursday, November 10, 2005 6:43 PM
>> Subject: RE: [ RadSafe ] Disposal via Decay in
>> Storage
>>
>>
>> >
>> > Technetium-99m has a six (6) hour half-life.
>> After sixty (60) hours it
>> > should have decayed away. This is
>> radiopharmaceutical that is commonly
>> > used. That's why it is popular, otherwise we
>> would have people walking
>> > around who are 'hot'.
>> >
>> > Edmond J. Baratta
>> > Radiation Safety Officer
>> > Tel. No. 781-729-5700, ext 728
>> > FAX: 781-729-3593
>> >
>> > This is my opinion and not those of my Agency.
>> >
>> >
>> > -----Original Message-----
>> > From: radsafe-bounces at radlab.nl
>> [mailto:radsafe-bounces at radlab.nl] On
>> > Behalf
>> > Of Cary Renquist
>> > Sent: Wednesday, November 09, 2005 6:02 PM
>> > To: RADSAFE List
>> > Subject: [ RadSafe ] Disposal via Decay in Storage
>> >
>> > Quick question:
>> >
>> > Is Tc-99m a candidate for disposal via
>> > decay-in-storage?
>> >
>> > If so, what would be a acceptable method for
>> > monitoring the decayed material prior to release?
>> >
>> > Thanks for any info.
>> > Cary
>> >
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>
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