XRay

1
X-Ray
X-rays are a type of electromagnetic radiation
with wavelengths of around 10-10 meters. When
medical X-rays are being produced, a thin
metallic sheet is placed between the emitter and
the target, effectively filtering out the lower
energy (soft) X-rays. This is often placed close
to the window of the X-ray tube. The resultant
X-ray is said to be hard. Soft X-rays overlap the
range of extreme ultraviolet. The frequency of
hard X-rays is higher than that of soft X-rays,
and the wavelength is shorter. Hard X-rays
overlap the range of "long"-wavelength (lower
energy) gamma rays, however the distinction
between the two terms depends on the source of
the radiation, not its wavelength X-ray photons
are generated by energetic electron processes,
gamma rays by transitions within atomic nuclei.
2
Radio Therapy
Radiation therapyalso called radiotherapyis a
highly targeted, highly effective way to destroy
cancer cells that may linger after surgery.
Radiation can reduce the risk of recurrence by
50 to 66 (about a half to two-thirds reduction
in risk). radiation therapy is relatively easy to
tolerate, and its side effects are limited to the
treated area
3
DNA
Deoxyribonucleic acid (DNA) is a nucleic acid
that contains the genetic instructions for the
development and function of living organisms. All
living things contain DNA, with the exception of
some viruses with RNA genomes. The main role of
DNA in the cell is the long term storage of
information. It is often compared to a blueprint,
since it contains the instructions to construct
other components of the cell, such as proteins
and RNA molecules. The DNA segments that carry
genetic information are called genes, but other
DNA sequences have structural purposes, or are
involved in regulating the expression of genetic
information.