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RE: transportation event
That depends. Would you consider a failure rate of less than 1% to be
adequate?
The opinions expressed are mine all mine...
I'm with the government, I'm here to help
Daren Perrero
perrero@iema.state.il.us
-----Original Message-----
From: William V Lipton [mailto:liptonw@DTEENERGY.COM]
Sent: Thursday, November 13, 2003 8:36 AM
To: John Jacobus
Cc: Doug Aitken; Luke.I.McCormick@nwd02.usace.army.mil;
radsafe@list.vanderbilt.edu
Subject: Re: transportation event
Has this event "... proven they are adequate?"
The opinions expressed are strictly mine.
It's not about dose, it's about trust.
Curies forever.
Bill Lipton
liptonw@dteenergy.com
John Jacobus wrote:
> Well, I guess that after 30 years, ammo boxes have
> proven they are adequate.
>
> --- William V Lipton <liptonw@dteenergy.com> wrote:
> > This arrangement is generally known as "scab
> > shielding," i.e. shielding which is not an integral
> > part of the packaging. I
> > generally avoid it, for two primary reasons: (1) It
> > often compromises package integrity. 2. The
> > shielding may fail within the
> > package, resulting in a dose rate increase. With
> > many radionuclides, the dose rate, not the quantity
> > is the limiting condition
> > for an RQ shipment.
> >
> > I remember a training class where a class exercise
> > involved determining the maximum quantity of solid
> > Co-60 that could be shipped
> > LQ. The activity limit is 10.8 mCi. With all of my
> > usual diplomatic skills, I challenged the instructor
> > to find a "strong tight"
> > package for that quantity of Co-60 which would meet
> > the 0.5 mR/hr dose rate limit. (The unshielded dose
> > rate from a Co-60 point
> > source of 10.8 mCi is ~150 mR/hr at 1 foot.)
> >
> > In a situation such as this, there's a great
> > temptation to add shielding to the package to
> > achieve dose rate compliance. I would
> > generally avoid this. Possible solutions: use a
> > bigger package, with the material securely centered
> > in the package; use a
> > shielded package; or ship as NOS, rather than RQ. I
> > suspect that an ammo box is not an adequate package
> > for material in a lead
> > pig, especially if it were dropped on a top corner.
> >
> > . . .
>
> =====
> +++++++++++++++++++
> "Eternal vigilance by the people is the price of liberty and . . . you
must pay the price if you wish to secure the blessing."
> Andrew Jackson
>
> -- John
> John Jacobus, MS
> Certified Health Physicist
> e-mail: crispy_bird@yahoo.com
>
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