Lacey_Che131_F2011_Lect-34.pptx

Lacey_Che131_F2011_Lect-34.pptx - Nuclear chemistry is the...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Nuclear chemistry is the study of reactions that involve changes in the nuclei of atoms. Lec-34: Nuclear Reactions Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011 1 Why Study Nuclear Processes Nuclear Reactions in the sun provide the energy required to sustain life required to sustain life on Earth 2 Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Why Study Nuclear Processes Nuclear reactions studies provide fundamental fundamental understanding of our universe 3 Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011 Why Study Nuclear Processes Nuclear Reactions play a crucial role in national security 4 Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011
Background image of page 2
Why Study Nuclear Processes Nuclear Reactions play a crucial role in medicin crucial role in medicine 5 Lungs Brain Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011 Why Study Nuclear Processes Nuclear waste issues play an important role in debates on the environment. 6 Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Why Study Nuclear Processes Radiotracers Radiotracers are used to follow an element through a chemical reaction. Photosynthesis has been studied using 14 C: 14 14 un gh 6 CO 2 + 6H 2 O C 6 H 12 O 6 +6O 2 sunlight chlorophyll The carbon dioxide is said to be 14 C labeled. 7 Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011 Why Study Nuclear Processes Biological effects: Radon exposure accounts for more than half of the average annual exposure to ionizing radiation. Rn Rn is thought to cause lung cancer is thought to cause lung cancer Rn is a noble gas – typically inhaled The half-life of is 3.82 days. The α -particles produced It decays as follows: 222 86 Rn 218 84 Po + 4 2 He have a high RBE 218 84 Po 214 82 Pb + 4 2 He The 218 Po gets trapped in the lungs where it continually The Po gets trapped in the lungs where it continually produces α -particles. particles. The EPA recommends 222 Rn levels in homes to be kept below 8 4 pCi per liter of air. Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011
Background image of page 4
Nuclear Reactions Induced Reactions Spontaneous Reactions (Radioactivity) 9 Roy A. Lacey, Stony Brook University; Che 131, Fall, 2011 Induced Reactions Nuclear transmutations are initiated via collisions between nuclei.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 14

Lacey_Che131_F2011_Lect-34.pptx - Nuclear chemistry is the...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online