The usage of X-rays

called Wilhelm Roentgen.  In 1895 Roentgen discovered X-rays almost by

accident.  Whilst doing some experiments in which he passed an electric current through Crookes tubes (special tubes containing a cathode and electrode from which the air has been removed), Roentgen noticed that photographic plates nearby began to grow fogged.  To discover why this occurred he placed black paper on the tube and then switched on the current.  Nearby a screen coated with barium began to glow.  This caused Roentgen to believe that unknown rays produced inside the tube were passing through the paper to make this fluorescent substance give out light.  These he named X-rays since x is a scientific number for anything that is unknown. 

all travel at the speed of light, which is 300

000km per second
The main use of X-rays is in medicine checking for broken bones, but they are also used in other ways. It imaging creates pictures of the inside of your body. The images show the part of your body in different shades of black and white.

mother’s womb their risk of all cancers increases by 40%,

of tumors, of the nervous system by 50%, leukemious by 70%.
It can caus mutation in our DNA.

breast cancer.
Other uses are in industry:
For example, At airports

to check costumers and baggage.
One of the riskiest of all diagnostic tools is the X ray machine.

should use x-rays machines when we need it or when

we pass a medical examination.
For example, use tomography once a 3 year, looking th dose, bone radiography once a 6 months, mammography once a 7 weeks and e.t.c.