Phy Sci Ch 18 Radiation

The type of radioactive particle that can be stopped by a sheet of paper is the ______.

• gamma ray
• beta particle
• alpha particle

The most penetrating type of radiation is the ______.

• gamma ray
• beta particle
• alpha particle

Radiation present in the environment but not produced by humans is called ______.particles

• radiometric radiation
• radioactive tracer radiation
• background radiation

A helium nucleus with two protons and two neutrons is called a(n) ______.

• gamma ray
• beta particle
• alpha particle

The largest source of background radiation is ______.

• cosmic rays
• radon gas
• trees

Carbon-14 is useful for dating fossils that are ______.

• more than 50,000 years old
• less than 50,000 years old

An instrument that detects radiation when a charged particle ionizes a gas that allows a current to flow and causes a speaker to click

• Geiger counter
• wire chamber
• click counter

Negatively charged particles emitted from a nucleus at a high speed are ______.

• alpha particles
• X-rays
• gamma rays
• beta particles

When the strong force is not large enough to hold the nucleus together tightly, the nucleus can ______.

• collapse
• decay

A radioactive isotope used to detect thyroid problems is ______.

• iodine-131
• iodine-127