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Old 07-24-2010, 05:14 PM   #1
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Default After piercing your taint and depositing......

Iodine 125 seeds into your prostate. How long would it take for those radioactive seeds to deliver 95% of their dose???

This is a relatively easy one, but I wanted to share the pain that I have been going through while prepping for my part two ABR physics exam on August 31.
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Old 07-24-2010, 05:28 PM   #2
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62 hours or so? That sucks; tumor?
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Old 07-24-2010, 06:07 PM   #3
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much much longer, and indepedent of tumor. half life for I-125 is 60 days.
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Old 07-24-2010, 08:09 PM   #4
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Is it

t = -(T½/.693) x ln(Final/Initial)

t = -(59.408/.693) x ln(5/100)

t = -85.726 x -2.996

t = 256.812 days?
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Old 07-24-2010, 09:33 PM   #5
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I agree.

A lead pig (cylinder to put source inside) with 2cm wall thickness is inside a 30cm diameter polyurethane foam shipping drum. HVL of lead is 5.5mm. HVL (half value layer, thickness of material required to reduce exposure rate by 1/2) The exposure rate constant for Ir-192 is 4.69 R cm^2/ MCi hr at 1 meter. What is the max activity to keep the activity at the surface of the shipping container less than 50 mR/hr?
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Old 07-25-2010, 12:51 AM   #6
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2cm/.55cm = 3.6HVL
3.6HVL = 9%
4690mR/hr * .09 = 422.1mR/hr

1m = 100cm
100cm/30cm = 3.3cm
πr² * ∫sinx^2x * 3.3cm
x = -sinxcosx * ∑f(422.1mR/hr*x)i+2
ln |-sinxcosx| / tan 1-(3.3^422.1mR/hr * x) + ∞
dy/dx (sin/cos x + 3648.2mR/hr * sec³x/cotx) * dy/dx -∫(csc²y)]0-2
3.6HVL / log(dT/dt K(y-T)) + x/2 - 2(ln 32mR/hr) * 372MCi + √(π-i)/(x) / 0
x = Name:  gmailpoop.png
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Size:  217 Bytes


Just tell people to stay away from the container lol. GL on the exam, I feel for you.
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Old 07-25-2010, 01:09 AM   #7
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I was working off a half-life of 13 hours. Google/math fail. Hope it turns out well, though.
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Old 07-25-2010, 01:46 AM   #8
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I've got a better idea, drop out of school and get a job in IT. Work hard for a few years and make 6 figures. I should write a book on how to win at life.
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Old 07-25-2010, 02:41 AM   #9
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I get 29.9 mCi
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Old 07-25-2010, 02:42 AM   #10
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Quote:
Originally Posted by neogenesis2004 View Post
I've got a better idea, drop out of school and get a job in IT. Work hard for a few years and make 6 figures. I should write a book on how to win at life.
me too!
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Old 07-25-2010, 03:08 AM   #11
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Originally Posted by neogenesis2004 View Post
I've got a better idea, drop out of school and get a job in IT. Work hard for a few years and make 6 figures. I should write a book on how to win at life.
Or be a male nurse. Find more tail than you can handle while making the same 6 figures.
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Old 07-25-2010, 03:38 AM   #12
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Or be a male nurse. Find more tail than you can handle while making the same 6 figures.
No nurse I have met makes more than 80k.
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Old 07-25-2010, 03:40 AM   #13
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Quote:
Originally Posted by chpmnsws6 View Post
Or be a male nurse. Find more tail than you can handle while making the same 6 figures.
Win
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Old 07-25-2010, 11:04 AM   #14
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Quote:
Originally Posted by Bond View Post
Win
I know a few male nurses... they are more gay than boy george! But then again it could be a by-product of the DC region?

Ohh, here is a cool tool that we use for doing DER and DE calculations:

http://www.radprocalculator.com/

When all else fails... wear a dosimeter! Check out these guys:http://www.polimaster.us/

If you see anything you like... let me know cuz this is where I work

Cheers,
[email protected]
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Old 07-25-2010, 11:42 AM   #15
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Originally Posted by faeflora View Post
No nurse I have met makes more than 80k.
It's possible. Working the night shift and never being home helps.
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Old 07-25-2010, 12:28 PM   #16
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my buddy's wife makes into 6 figures. night shift, 4 long days per week.
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Old 07-25-2010, 12:45 PM   #17
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Male nurses are knee deep in *****. Its not like your not already driving a miata anyway.
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Old 07-25-2010, 12:51 PM   #18
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Originally Posted by spoolin2bars View Post
my buddy's wife makes into 6 figures. night shift, 4 long days per week.
Overtime 6 figures doesn't count. By that standard, cops make 6 fitures
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Old 07-25-2010, 02:18 PM   #19
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Originally Posted by faeflora View Post
No nurse I have met makes more than 80k.
My mom brought in 132k last tax period as an RN with only an associates
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Old 07-25-2010, 02:28 PM   #20
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Quote:
Originally Posted by djp0623 View Post
I get 29.9 mCi
How did you get that?
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