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RadConSuper

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Moly-99
« on: Jul 09, 2004, 12:30 »
Could someone tell me what the dose rate from a 1130 Curie Moly-99 source would be. Also what the tenth value layer for DU is? Thanks for the help!

Offline Roll Tide

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Re: Moly-99
« Reply #1 on: Jul 09, 2004, 12:59 »
Also what the tenth value layer for DU is? Thanks for the help!

http://www.labor-spiez.ch/e/bg_info/du/du_study_print.pdf
page 7 says 5 times better than lead. (Trying to get time to work on the calculation. I am assuming you need the Tc-99 daughter as well (with 66 hour half-life of your parent nuclide, you will have the Tc-99 much longer!)
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Re: Moly-99
« Reply #2 on: Jul 09, 2004, 03:14 »
Could someone tell me what the dose rate from a 1130 Curie Moly-99 source would be.

Using 6CEN, I calculate 9221 R/hr at 1 foot. I haven't done too many of these lately, so double-check. If that is right, the doserate at 1 meter (40 inches) is 830 R/hr.

http://www.raymcginnis.net/Miscellaneous.aspx
results show 332,000 at 5 cm. This sounds like a good application for DU shielding. If I read it correctly, that is about 0.3 inches for a tenth-thickness given a ballpark 1 MeV decay energy.

I will need to be more awake to deal with the Tc-99 radioactive daughter! (Maybe one of the ALARA dudes on the site will sharpen up their sliderule and dazzle us!)
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.
.....
And for the support of this Declaration, with a firm reliance on the protection of divine Providence, we mutually pledge to each other our Lives, our Fortunes and our sacred Honor.

RadConSuper

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Re: Moly-99
« Reply #3 on: Jul 12, 2004, 12:22 »
Thanks for the help Roll Tide.

 


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