EOH PRACTICE FINAL EXAM 2025 UPDATED QUESTIONS AND
ANSWERS
What is the difference between ionizing and non-ionizing radiation? - CORRECT
ANSWER✅✅✅Essentially, the wavelength; non-ionizing radiation has wider wavelengths than
ionizing, and it does not remove electrons from the material it interacts with. Ionizing radiation does
have enough energy to electrons, creating ions; its the ionizing radiation that is used in medical
procedures. Non-ionizing consists of infrared, microwaves, and radio waves.
What are the main types of ionizing radiation? - CORRECT ANSWER✅✅✅alpha particles - positively
charged, made up of 2 protons and 2 neutrons
beta particles - a single electron or positron
gamma rays - generally accompanying beta particles, high energy electromagnetic radiation and needs
very dense material in order to stop it
What material can stop an alpha particle? - CORRECT ANSWER✅✅✅Thin materials, such as skin, or
even paper
What material can stop an beta particle? - CORRECT ANSWER✅✅✅Dense material, such as wood or
aluminium; these can pass through skin and can be lethal
What material can stop an gamma ray? - CORRECT ANSWER✅✅✅several inches of concrete, steel,
etc
What are some natural sources of radiation? - CORRECT ANSWER✅✅✅(everything...) soil, air,
water; natural sources account for 82% of avg exposure
What are enhanced sources of radiation? - CORRECT ANSWER✅✅✅Natural sources manipulated by
man, like that from mining or air travel
What are some man-made source of radiation? - CORRECT ANSWER✅✅✅Typically due to medicine,
but can also be related to nuclear fall out or plant emissions; accounts for 18% of av exposure
, Who discovered the x-ray and when? - CORRECT ANSWER✅✅✅Wilhelm Roentgen
1895
Who discovered radioactivity in uranium and when? - CORRECT ANSWER✅✅✅Henri Becquerel
1896
Who purified radium metal and when? - CORRECT ANSWER✅✅✅Marie Curie
1911
What happened at the US Radium and Radium Dial Company? - CORRECT ANSWER✅✅✅In the 20's
and 30's, women were dying from radium poisoning
What procedure became popular for hair removal in the 10's and 20's? - CORRECT
ANSWER✅✅✅Hair Removal; would later lead to cases of skin cancer
What major event(s) happened in 1945? - CORRECT ANSWER✅✅✅America used the atomic bomb,
first testing it in New Mexico and then dropping two bombs in Japan, one on Hiroshima on August 6th
and the other on Nagasaki on August 9th
When was the first nuclear power plant connected and where? - CORRECT ANSWER✅✅✅1954
Obninsk, Russia
When was the first power plant opened in the US? - CORRECT ANSWER✅✅✅1957
What major nuclear plant disaster happened in 1979?
1986? - CORRECT ANSWER✅✅✅Three Mile Island meltdown
Chernobyl meltdown
Define half-life - CORRECT ANSWER✅✅✅the period of time it takes for half of the original amount
of material to decay
ANSWERS
What is the difference between ionizing and non-ionizing radiation? - CORRECT
ANSWER✅✅✅Essentially, the wavelength; non-ionizing radiation has wider wavelengths than
ionizing, and it does not remove electrons from the material it interacts with. Ionizing radiation does
have enough energy to electrons, creating ions; its the ionizing radiation that is used in medical
procedures. Non-ionizing consists of infrared, microwaves, and radio waves.
What are the main types of ionizing radiation? - CORRECT ANSWER✅✅✅alpha particles - positively
charged, made up of 2 protons and 2 neutrons
beta particles - a single electron or positron
gamma rays - generally accompanying beta particles, high energy electromagnetic radiation and needs
very dense material in order to stop it
What material can stop an alpha particle? - CORRECT ANSWER✅✅✅Thin materials, such as skin, or
even paper
What material can stop an beta particle? - CORRECT ANSWER✅✅✅Dense material, such as wood or
aluminium; these can pass through skin and can be lethal
What material can stop an gamma ray? - CORRECT ANSWER✅✅✅several inches of concrete, steel,
etc
What are some natural sources of radiation? - CORRECT ANSWER✅✅✅(everything...) soil, air,
water; natural sources account for 82% of avg exposure
What are enhanced sources of radiation? - CORRECT ANSWER✅✅✅Natural sources manipulated by
man, like that from mining or air travel
What are some man-made source of radiation? - CORRECT ANSWER✅✅✅Typically due to medicine,
but can also be related to nuclear fall out or plant emissions; accounts for 18% of av exposure
, Who discovered the x-ray and when? - CORRECT ANSWER✅✅✅Wilhelm Roentgen
1895
Who discovered radioactivity in uranium and when? - CORRECT ANSWER✅✅✅Henri Becquerel
1896
Who purified radium metal and when? - CORRECT ANSWER✅✅✅Marie Curie
1911
What happened at the US Radium and Radium Dial Company? - CORRECT ANSWER✅✅✅In the 20's
and 30's, women were dying from radium poisoning
What procedure became popular for hair removal in the 10's and 20's? - CORRECT
ANSWER✅✅✅Hair Removal; would later lead to cases of skin cancer
What major event(s) happened in 1945? - CORRECT ANSWER✅✅✅America used the atomic bomb,
first testing it in New Mexico and then dropping two bombs in Japan, one on Hiroshima on August 6th
and the other on Nagasaki on August 9th
When was the first nuclear power plant connected and where? - CORRECT ANSWER✅✅✅1954
Obninsk, Russia
When was the first power plant opened in the US? - CORRECT ANSWER✅✅✅1957
What major nuclear plant disaster happened in 1979?
1986? - CORRECT ANSWER✅✅✅Three Mile Island meltdown
Chernobyl meltdown
Define half-life - CORRECT ANSWER✅✅✅the period of time it takes for half of the original amount
of material to decay
