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NE 490 Exam #1
Question | Answer |
---|---|
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 |