The γ-ray source used in 57Fe Mössbauer spectroscopy is :
57Co
Mössbauer spectroscopy needs a radioactive source that populates an excited level of the same nucleus being studied, so that the emitted γ-ray can be resonantly absorbed by the sample.
57Co (half-life about 271 days) decays by electron capture to an excited state of 57Fe at 136 keV, which cascades to the 14.4 keV level; the 14.4 keV transition to the ground state is the Mössbauer γ-ray used for iron.
119mSn is the source for 119Sn Mössbauer spectroscopy and 121mSn is the source for 121Sb Mössbauer spectroscopy, while a technetium isotope cannot populate an excited state of iron.
So the source for 57Fe Mössbauer work is cobalt-57, usually diffused into a rhodium matrix.
Hence, 57Co.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
