Application of Radioactivity

Q. Assume that the isotope $U^{238}$ and $U^{235}$ are found in the ratio 64 : 1 presently at a planet. At the time of the creation of the planet, they were present in an equal ratio.What is the age of the planet (in million years ${10}^6$ ). The half-life period of $U^{238}$ and $U^{235}$ are $4.45\times {10}^9$ and $7.0\times {10}^8$ year respectively.

Q.

Food irradiation is used to

1. precook food

2. kill insects

3. kill micro-organisms

4. increase nutrient value

Q.

Which of the following statements about the biological effects of radiation is false?

1. Radiation can cause leukemia

2. Ionizing radiation is dangerous

3. Radon is absorbed through the skin

4. Radon is harmful because it decays to polonium

Q. A moderator in a nuclear reactor serves to

1. Slow neutrons
2. Provide fissionable isotopes
3. Diminish the nuclear binding energy
4. Accelerate neutrons

Q.

The radioisotopes used for diagnosis in nuclear medicine

1. have short half-lives

2. travel rapidly through tissue

3. are usually gamma emitters

4. all of these

Q. Assume that the isotope $U^{238}$ and $U^{235}$ are found in the ratio 64 : 1 presently at a planet. At the time of the creation of the planet, they were present in an equal ratio.What is the age of the planet (in million years ${10}^6$ ). The half-life period of $U^{238}$ and $U^{235}$ are $4.45\times {10}^9$ and $7.0\times {10}^8$ year respectively.

Q. Assume that the isotope $U^{238}$ and $U^{235}$ are found in the ratio 64 : 1 presently at a planet. At the time of the creation of the planet, they were present in an equal ratio.What is the age of the planet (in million years ${10}^6$ ). The half-life period of $U^{238}$ and $U^{235}$ are $4.45\times {10}^9$ and $7.0\times {10}^8$ year respectively.

Q. The age of archaeological findings can be determined by _______the method.

1. ${}_6{C}^{14}$
2. ${}_6{C}^{12}$
3. ${}_6{C}^{10}$
4. none of these

Q.

The radioisotopes used for diagnosis in nuclear medicine

1. have short half-lives

2. travel rapidly through tissue

3. are usually gamma emitters

4. all of these

Q.

In a living organism, the C-14 concentration

1. varies unpredictably during the lifetime of the organism

2. remains approximately constant

3. continually increases

4. continually decreases

Q.

Food irradiation is used to

1. kill micro-organisms

2. precook food

3. kill insects

4. increase nutrient value

Q.

Which of the following statements about the biological effects of radiation is false?

1. Radiation can cause leukemia

2. Ionizing radiation is dangerous

3. Radon is absorbed through the skin

4. Radon is harmful because it decays to polonium

Q. Assume that the isotope $U^{238}$ and $U^{235}$ are found in the ratio 64 : 1 presently at a planet. At the time of the creation of the planet, they were present in an equal ratio.What is the age of the planet (in million years ${10}^6$ ). The half-life period of $U^{238}$ and $U^{235}$ are $4.45\times {10}^9$ and $7.0\times {10}^8$ year respectively.