147699
In radioactive decay process, the negatively charged emitted $\beta$-particles are
1 the electrons present inside the nucleus
2 the electrons produced as a result of the decay of neutrons inside the nucleus
3 the electrons produced as a result of collisions orbiting between atoms
4 the electrons orbiting around the nucleus
Explanation:
B In negative $\beta$-decay a neutron in the nucleus in transformed into a proton, an electron and an antineutrino. Hence, in radioactive decay process, the negatively charged emitted $\beta$-particles are the electrons produced as a result of the decay of neutrons present inside the nucleus.
JCECE-2008
NUCLEAR PHYSICS
147701
Radioactive nuclei that are injected into a patient collected at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can be recorded by a detector. This procedure provides an important diagnostic tools called:
1 gamma camera
2 CAT scan
3 radiotracer technique
4 gamma ray spectroscopy
Explanation:
C The radiotracer group applies a variety of techniques involving radioactive atoms as tracers for diffusion studies. In the classical radiotracer technique, radioactive isotopes of the element whose diffusion is to be investigated are deposited on the specimen surface. Then the specimen is diffusion annealed in furnace at the temperature $\mathrm{T}$ at which the diffusion coefficient is to be measured. From the radioactivity of the taken off layers the penetration profile of the radiotracers which results from diffusion for the time $t$ at the temperature $\mathrm{T}$ may be reconstructed. A comparison of this with the radiotracer distribution prior to diffusion annealing yields the diffusion coefficient. This is an important diagnostic tool. Tracers used in medical field and in study of plants and animals.
JCECE-2004
NUCLEAR PHYSICS
147719
In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of and important diagnostic procedure called.
1 MRI
2 PET
3 $\mathrm{CAT}$
4 SPECT
Explanation:
B In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma rays photons. This process forms the basis of an important diagnostic procedure called PET. Positron emission tomography (PET) is a nuclear medicine medical imaging technique which produces three dimensional image area map of functional process in the body. The positron annihilates with an electron producing a pair of annihilation photons (gamma rays) moving in opposite direction.
AIIMS-2003
NUCLEAR PHYSICS
147732
Decay constant of radium is $\lambda$. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
1 $\lambda$
2 more than $\lambda$
3 less than $\lambda$
4 zero
Explanation:
A Chemical combination does not change the decay process. Hence, the decay constant of radium bromide will be $\lambda$.
147699
In radioactive decay process, the negatively charged emitted $\beta$-particles are
1 the electrons present inside the nucleus
2 the electrons produced as a result of the decay of neutrons inside the nucleus
3 the electrons produced as a result of collisions orbiting between atoms
4 the electrons orbiting around the nucleus
Explanation:
B In negative $\beta$-decay a neutron in the nucleus in transformed into a proton, an electron and an antineutrino. Hence, in radioactive decay process, the negatively charged emitted $\beta$-particles are the electrons produced as a result of the decay of neutrons present inside the nucleus.
JCECE-2008
NUCLEAR PHYSICS
147701
Radioactive nuclei that are injected into a patient collected at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can be recorded by a detector. This procedure provides an important diagnostic tools called:
1 gamma camera
2 CAT scan
3 radiotracer technique
4 gamma ray spectroscopy
Explanation:
C The radiotracer group applies a variety of techniques involving radioactive atoms as tracers for diffusion studies. In the classical radiotracer technique, radioactive isotopes of the element whose diffusion is to be investigated are deposited on the specimen surface. Then the specimen is diffusion annealed in furnace at the temperature $\mathrm{T}$ at which the diffusion coefficient is to be measured. From the radioactivity of the taken off layers the penetration profile of the radiotracers which results from diffusion for the time $t$ at the temperature $\mathrm{T}$ may be reconstructed. A comparison of this with the radiotracer distribution prior to diffusion annealing yields the diffusion coefficient. This is an important diagnostic tool. Tracers used in medical field and in study of plants and animals.
JCECE-2004
NUCLEAR PHYSICS
147719
In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of and important diagnostic procedure called.
1 MRI
2 PET
3 $\mathrm{CAT}$
4 SPECT
Explanation:
B In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma rays photons. This process forms the basis of an important diagnostic procedure called PET. Positron emission tomography (PET) is a nuclear medicine medical imaging technique which produces three dimensional image area map of functional process in the body. The positron annihilates with an electron producing a pair of annihilation photons (gamma rays) moving in opposite direction.
AIIMS-2003
NUCLEAR PHYSICS
147732
Decay constant of radium is $\lambda$. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
1 $\lambda$
2 more than $\lambda$
3 less than $\lambda$
4 zero
Explanation:
A Chemical combination does not change the decay process. Hence, the decay constant of radium bromide will be $\lambda$.
147699
In radioactive decay process, the negatively charged emitted $\beta$-particles are
1 the electrons present inside the nucleus
2 the electrons produced as a result of the decay of neutrons inside the nucleus
3 the electrons produced as a result of collisions orbiting between atoms
4 the electrons orbiting around the nucleus
Explanation:
B In negative $\beta$-decay a neutron in the nucleus in transformed into a proton, an electron and an antineutrino. Hence, in radioactive decay process, the negatively charged emitted $\beta$-particles are the electrons produced as a result of the decay of neutrons present inside the nucleus.
JCECE-2008
NUCLEAR PHYSICS
147701
Radioactive nuclei that are injected into a patient collected at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can be recorded by a detector. This procedure provides an important diagnostic tools called:
1 gamma camera
2 CAT scan
3 radiotracer technique
4 gamma ray spectroscopy
Explanation:
C The radiotracer group applies a variety of techniques involving radioactive atoms as tracers for diffusion studies. In the classical radiotracer technique, radioactive isotopes of the element whose diffusion is to be investigated are deposited on the specimen surface. Then the specimen is diffusion annealed in furnace at the temperature $\mathrm{T}$ at which the diffusion coefficient is to be measured. From the radioactivity of the taken off layers the penetration profile of the radiotracers which results from diffusion for the time $t$ at the temperature $\mathrm{T}$ may be reconstructed. A comparison of this with the radiotracer distribution prior to diffusion annealing yields the diffusion coefficient. This is an important diagnostic tool. Tracers used in medical field and in study of plants and animals.
JCECE-2004
NUCLEAR PHYSICS
147719
In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of and important diagnostic procedure called.
1 MRI
2 PET
3 $\mathrm{CAT}$
4 SPECT
Explanation:
B In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma rays photons. This process forms the basis of an important diagnostic procedure called PET. Positron emission tomography (PET) is a nuclear medicine medical imaging technique which produces three dimensional image area map of functional process in the body. The positron annihilates with an electron producing a pair of annihilation photons (gamma rays) moving in opposite direction.
AIIMS-2003
NUCLEAR PHYSICS
147732
Decay constant of radium is $\lambda$. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
1 $\lambda$
2 more than $\lambda$
3 less than $\lambda$
4 zero
Explanation:
A Chemical combination does not change the decay process. Hence, the decay constant of radium bromide will be $\lambda$.
147699
In radioactive decay process, the negatively charged emitted $\beta$-particles are
1 the electrons present inside the nucleus
2 the electrons produced as a result of the decay of neutrons inside the nucleus
3 the electrons produced as a result of collisions orbiting between atoms
4 the electrons orbiting around the nucleus
Explanation:
B In negative $\beta$-decay a neutron in the nucleus in transformed into a proton, an electron and an antineutrino. Hence, in radioactive decay process, the negatively charged emitted $\beta$-particles are the electrons produced as a result of the decay of neutrons present inside the nucleus.
JCECE-2008
NUCLEAR PHYSICS
147701
Radioactive nuclei that are injected into a patient collected at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can be recorded by a detector. This procedure provides an important diagnostic tools called:
1 gamma camera
2 CAT scan
3 radiotracer technique
4 gamma ray spectroscopy
Explanation:
C The radiotracer group applies a variety of techniques involving radioactive atoms as tracers for diffusion studies. In the classical radiotracer technique, radioactive isotopes of the element whose diffusion is to be investigated are deposited on the specimen surface. Then the specimen is diffusion annealed in furnace at the temperature $\mathrm{T}$ at which the diffusion coefficient is to be measured. From the radioactivity of the taken off layers the penetration profile of the radiotracers which results from diffusion for the time $t$ at the temperature $\mathrm{T}$ may be reconstructed. A comparison of this with the radiotracer distribution prior to diffusion annealing yields the diffusion coefficient. This is an important diagnostic tool. Tracers used in medical field and in study of plants and animals.
JCECE-2004
NUCLEAR PHYSICS
147719
In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of and important diagnostic procedure called.
1 MRI
2 PET
3 $\mathrm{CAT}$
4 SPECT
Explanation:
B In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma rays photons. This process forms the basis of an important diagnostic procedure called PET. Positron emission tomography (PET) is a nuclear medicine medical imaging technique which produces three dimensional image area map of functional process in the body. The positron annihilates with an electron producing a pair of annihilation photons (gamma rays) moving in opposite direction.
AIIMS-2003
NUCLEAR PHYSICS
147732
Decay constant of radium is $\lambda$. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
1 $\lambda$
2 more than $\lambda$
3 less than $\lambda$
4 zero
Explanation:
A Chemical combination does not change the decay process. Hence, the decay constant of radium bromide will be $\lambda$.
