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Sodium iodide crystal (NaI)
It scintillate with good efficiency when gamma ray is absorbed, these crystals where attached directly to the PTM to detect a weak flashes of light .They where improved by adding a trace amounts of thallium(Tl)and often referred as NaI(Tl) detector. It is the most widely used detector in medicine .A nuclear medicine scintillation detector system
1-Scince the NaI(Tl)detector is very sensitive ,it has to be well shielded from background radiation .2- five or more cm of lead surrounding the NaI(Tl)crystal except at the collimator .3-The electron emitted at the photocathode of PTM produce an electrical pulse at the output .4-this pulse is electronically amplified at the amplifier. 5-The pulse can be directly counted by the scalar.6-The pulse pass to the single channel pulse height analyzer(PHA) to determine the energy of the gamma raysIt contain an upper discriminator (it rejects the pulses larger than a chosen size)
lower discriminator ( reject the pulses smaller than a chosen size)
window(it is the energy difference between the upper and lower limits )
Multi Chanel analyzer (MCA): it determine the pulse height distribution of all the pulses from the detector ,so it sorts the pulses according to the size.
A bat emits a sound whose frequency is 142 kHz. The speed of sound in air at 20.0°C is 343 m/s. However, the air temperature is 35°C, so the speed of sound is not 343 m/s. Find the
In the Compton effect, a photon of wavelength l collides with a stationary electron. The wavelength of the emitted photon is: a) longer than l b) shorter than l c)
Fusion Reaction: In nuclear fusion light nuclei are brought together to form a relation heavier nucleus. They energy free in nuclear fusion is larger than that free in fission.
Example like or unlike parallel forces
a boy throws a ball of mass 20 kg vertically upwards.it raises to a maximum height of 100 m.at what height will the kinetic energy be reduced to 70%
Pascal's principle: Pressure applied onto an enclosed incompressible static fluid is transmitted undiminished to all of the parts of the fluid.
Q. According to classical mechanics, what is the concept of time ? As-per to classical mechanics (i) The time interval among two events has the same value for all observers
Q. If an object isn't moving, no external force acts on it. No it is always not true, there would be balanced forces which cancel each other out leaving no net force. Example:
uncontrollable reaction
A model to show the apparent path of the sun among the stars The signs of the zodiac are drawn in the correct order on a strip of paper about 60 cm long and 8 cm wide. The ends
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