Discovery of X-rays: Lesson 1

Properties of x-rays

-Highly penetrating, invisible ray in the form of electromagnetic radiation -Electrically neutral; electric & magnetic fields do not affect them -Can be produced over a wide variety of energies & wavelengths -Release heat when passing through matter (thermal transfer) -Travel in straight lines -travel at the speed of light -ionize matter -cause florescence -produce chemical or biological changes -cannot be focused by a lens -affect film -produce secondary and scatter radiation

During the process:

-in the dark, put into cardboard covering -rays caused a florescent glow on phosphor screen -as current increased glow increased -played with holding different materials

2.5 cm=

1 inch

how to convert from decimal to fraction

1) take decimal and put 1 in the denominator 2) Then multiply to remove decimal places 3)Find GCF and divide both top and bottom

1 mA=

1/1000 amps

1/ms=

1/1000 of a second

1 second=

1000 milliseconds

1 kV=

1000 volts

When did Rontgen die?

25 years after discovering x-rays from colon cancer

who was the first radiograph of?

Bertha, his wife

First diagnostic images

Eddie McCarthy wrist after injured from iceskating, each image took 25 minutes

Who invented the fluoroscopic tube

Thomas Edison

How did it happen?

While he was playing with a cathode ray tube

What did fluoroscopic images do?

allow moving images

Who discovered X-rays?

by German physicist, Wilhelm Conrad Rontgen

The radiation unit used to describe the quantity of radiation exposure in a specific area is:

coulomb/kg (roentgen)

s (time)

determines how long the exposure to the patient lasts; length of exposure

mA

determines the exposure current; the amount of current sent to the x-ray tube

mAs

determines the overall amount (or number) of x-rays produced in the tube

The radiation unit used to describe the quantity of absorbed dose for patient exams is:

gray (rad)

To determine mAs from mA and s

mA times s = mAs

On what day were they discovered?

on November 8, 1895

The radiation unit used to describe the quantity of biological response (radiation equivalent man) is:

sievert (rem)

what caused him to discover you could see internal structures of the body?

when he held a piece of led near and discovered the bones of his hand came up

why is it called an x-ray?

x stands for unknown and he didn't know what the ray was