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X-RAY Origin

X-ray was first discovered on November 8, 1895 by German scientist Roentgen (W. C. Röntgen, 1845-1923).

What is radiation?

the flow of energy released from unstable atoms or atomic nuclei


[radiation of legal terms]   다운받기
Radiation is defined by Presidential Decree as having the ability to direct or indirect ionize air, either electromagnetic or corpuscular beam.


1. Alpha, deuteron, positive, beta, and other Heavy Charged Particles rays
2. Neutron rays
3. Gamma and X-ray
4. Electron rays with more than 50,000 electron volts


방사선의 종류와 그에 따른 투과력 방사선의 종류와 그에 따른 투과력

difference between radiation and radioactivity

1. Radioactive - material remains.
(For example, uranium, radium, thorium, and radioactive materials.)
a substance of the nature of spontaneously emitting radiation.
2. Radiation (X-ray) - no matter remains.
(For example, X-ray foreign body inspection equipment, X-ray imaging equipment, cancer treatment devices.)
man-made artificial radiation
3. natural and artificial radiation
Differentiate between natural and artificial radiation depending on the reason for the radiation, but the nature of the radiation and its effect on the human body are all the same.

In space, 0.35 mSV (millisievert) per year, 1.3 mSV per year in air, 0.4 mSV per year on land, and 0.35 mSV per year in food. In addition, radiation is being generated in our bodies and even cigarettes. In addition, radiation is being generated in our bodies and even cigarettes.

In the case of artificial radiation, such as X-ray foreign body inspection equipment, the government thoroughly manages to ensure that the public is not exposed to more than 1 mSV per year in order to protect the public. Nuclear power plants, a leading source of artificial radiation, are also strictly regulated with annual total radiation doses of 0.05 mSV or less. These amounts are actually very small amounts of radiation that fall short of the amount of natural radiation we receive on a daily basis, and that's actually going to change the human body.

Natural Radiation vs Artificial Radiation

Natural radiation refers to the radiation of natural radioactive materials present in the natural world.
The radiation that has been on Earth since the birth of the Earth, which exists everywhere, and the average annual natural radiation dose of the world is 2.4 mSv per person, and the average of Korea is 3.08 mSv.
Artificial radiation refers to all artificially created radiation and is typical of medical and industrial x-rays.

radiation dose unit

classification new unit existing unit conversion unit explanation
radioactivity unit Bq Ci 1Ci = 3.7 X 1010 Bq It means that one atom collapses in one second.
radiation
unit		 Exposure Dose C/kg R 1R = 2.58 X 10-4 C/kg Charge generated per air unit mass by x-ray or r-ray
absorbed dose Gy rad 1Gy = 100rad energy of absorbed radiation per unit mass of material
Equivalent Dose Sv rem 1Sv = 100rem The amount of absorbed dose multiplied by the weight of the corresponding radiation when representing the exposed dose of the human body.
Effective Dose Sv rem 1Sv = 100rem If several tissues of the body are irradiated uniformly or unevenly in radiation, the amount to be used to assess the overall effect by reflecting the difference in relative risk by tissue, multiplied by tissue weight, is the sum of the equivalent dose of tissue or organ.

radiation dose unit

new unit
radioactivity unit Bq
radiation unit Exposure Dose C/kg
absorbed dose Gy
Equivalent Dose Sv
Effective Dose Sv
existing unit
radioactivity unit Ci
radiation unit Exposure Dose R
absorbed dose rad
Equivalent Dose rem
Effective Dose rem
conversion unit
radioactivity unit 1Ci = 3.7 X 1010 Bq
radiation unit Exposure Dose 1R = 2.58 X 10-4 C/kg
absorbed dose 1Gy = 100rad
Equivalent Dose 1Sv = 100rem
Effective Dose 1Sv = 100rem
*radioactivity unit
It means that one atom collapses in one second.
*Exposure Dose
Charge generated per air unit mass by x-ray or r-ray
*absorbed dose
energy of absorbed radiation per unit mass of material
*Equivalent Dose
The amount of absorbed dose multiplied by the weight of the corresponding radiation when representing the exposed dose of the human body.
*Effective Dose
If several tissues of the body are irradiated uniformly or unevenly in radiation, the amount to be used to assess the overall effect by reflecting the difference in relative risk by tissue, multiplied by tissue weight, is the sum of the equivalent dose of tissue or organ.