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NE 490 Exam #1

Probability of a Compton scattering is dependent on: Material electron density
Bremsstrahlung radiation is best produced by: High Z materials
4 organic bases of DNA? Adenine, Thymine, Guanine, Cytosine
How does a HCP's path and energy loss behave in a material? HCP travels in a straight line and cannot lose all energy in single event.
Describe Dicentric Chromosome Aberration Interchange between two separate chromosome, sticky ends join together, create asymmetric
Difference between chromosome and chromatid aberration. Chromosome aberrations happen before G1, chromatid aberrations happen after G1.
Describe ring lethal aberration Lethal, appear as a break in each arm, creates a ring
When does homogenous recombination happen? In G1 phase
When does nonhomogenous recombination happen? In S/G2 phase
How do neutrons interact with matter? Elastic scattering, inelastic scattering, particle ejection Remember, neutrons are indirectly ionizing, high LET
What free radicals are produced within water? OH-hydroxyl, e-aq-aqueous electron, H-unpaired electron
What are the different types of cell death? Autophagy, Necrosis, Apoptosis
What are the different genes that can possibly cause cancer? DNA repair genes, oncogenes, Tumor suppressor genes
Phases of radiation biology in order from longest to shortest Biological, chemical, physical
Phases of mitosis? Prophase, metaphase, anaphase, telophase
Describe spurs, blobs, and short tracks. Spurs (6-100 eV): sparsely ionizing, low LET, 4 nm range, created by 3 ion pairs Blob (100-500 eV): densely ionizing, higher LET, 7 nm, 12 ion pairs Short tracks (500-5000 eV): high LET, 20 nm in size, combination damage
Describe G value yield. The number of chemical species produced per 100 eV
Describe the different chromatid aberrations. Anaphase bridge: lethal, breaks may occur in both chromatid of same chromosome->sticky ends join, AFTER G2 Symmetrical translocation and deletion: non-lethal, occurs when break occurs in 2 pre replication chromosomes
Created by: 1672073429469679
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