• :00Days
  • :00Hours
  • :00Mins
  • 00Seconds
A new era for learning is coming soonSign up for free
Log In Start studying!

Select your language

Suggested languages for you:
Answers without the blur. Sign up and see all textbooks for free! Illustration


College Physics (Urone)
Found in: Page 1181

Answers without the blur.

Just sign up for free and you're in.


Short Answer

Suppose one food irradiation plant uses a \({}^{{\rm{137}}}{\rm{Cs}}\) source while another uses an equal activity of \({}^{{\rm{60}}}{\rm{Co}}\). Assuming equal fractions of the \({\rm{\gamma }}\) rays from the sources are absorbed, why is more time needed to get the same dose using the \({}^{{\rm{137}}}{\rm{Cs}}\) source?

Cobalt contains \({\rm{\gamma }}\) rays that are more energetic (frequency).

See the step by step solution

Step by Step Solution

Step 1: Define radiation

The emission or transmission of energy in the form of waves or particles across space or a material medium is known as radiation.

Step 2: Explanation

Look at food irradiation using \({}^{{\rm{137}}}{\rm{Cs}}\) and \({}^{{\rm{60}}}{\rm{Co}}\) as sources. Y rays are created from these sources when an equivalent amount of activity is utilised. Even yet, irradiating the same dosage from a \({}^{{\rm{137}}}{\rm{Cs}}\) source takes longer than from a \({}^{{\rm{60}}}{\rm{Co}}\) source.

Cobalt and caesium are two of the most well-known sources of \({\rm{\gamma }}\) rays, according to the literature. As \({\rm{\gamma }}\) rays are electromagnetic radiation, their radiation dosage at any given period is solely determined by their energy (frequency). So, because issue statement states that caesium takes longer than cobalt, we may safely assume that gamma rays from cobalt contain more energy than gamma rays from caesium.

According to the literature, the energy of \({\rm{\gamma }}\) rays from cobalt can range between \({\rm{1}}{\rm{.173}}\) and \({\rm{1}}{\rm{.332 MeV}}\), while the energy of \({\rm{\gamma }}\) rays from caesium is \({\rm{0}}{\rm{.662 MeV}}\).

In any instance, cobalt will always provide a higher radiation dose for the same level of source activity when exposed for the same period of time.

Therefore, cobalt has \({\rm{\gamma }}\) rays with a greater energy level (frequency).

Most popular questions for Physics Textbooks


Want to see more solutions like these?

Sign up for free to discover our expert answers
Get Started - It’s free

Recommended explanations on Physics Textbooks

94% of StudySmarter users get better grades.

Sign up for free
94% of StudySmarter users get better grades.