1000 3000 mSv WBC 0 diarrhea hair loss infection 5000 mSv LD 50 6000 mSv 100

1000 3000 msv wbc 0 diarrhea hair loss infection 5000

This preview shows page 21 - 25 out of 25 pages.

1000-3000 mSv: WBC = 0; diarrhea, hair loss, & infection 5000 mSv: LD 50 ≥6000 mSv: 100% death in weeks Just FYI Just FYI Know this 21
Image of page 21
Half Life All isotopes of all elements heavier than bismuth (atomic # 83) are radioactive. But some of these heavy elements still exist today because they decay very slowly . Half-life (t 1/2 ) – time required for half of a sample of radioactive material to decay ranges from short (nanoseconds) to long (billions of years). The half-life for a particular isotope is constant – no matter the amount of material, temperature, pressure . . . even if it’s part of a compound or not. 22
Image of page 22
Radioactive Decay half-life = 8 days etc. 1 st 8 days = ½ decays, ½ remains 3 rd 8 days = 1 / 8 remains 2 nd 8 days = ½ of what is left decays, ¼ remains 23
Image of page 23
Half-Life Examples 1.If you have 64 mg of 234Th (t1/2= 24.1 days), how long will it take until only 2 mg is left? 2.If a sample contains 3.0 g of 103Pd (t1/2= 17 days) after sitting for 51 days, how much 103Pd was there originally?
Image of page 24
Image of page 25

You've reached the end of your free preview.

Want to read all 25 pages?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes