Let's Look at the Special Exhibit
The Role of A-bomb Research Today

The medical records and other data accumulated through investigations of the world's first atomic bombing in Hiroshima are now indispensable in establishing international standards for protection from radiation and for the treatment of those exposed to radiation through nuclear power plant accidents around the world.
Yearly allowable radiation dosages for the general public and for workers at nuclear power plants or in other occupations that expose them to radiation are stipulated by law in accordance with the recommendations of the International Commission on Radiological Protection (ICRP). These recommendations are based largely on data from the RERF (formerly, ABCC).
The medical records accumulated during decades of survivor treatment are extremely useful in treating victims exposed accidentally elsewhere in the world. Medical personnel in Hiroshima dispatch medical teams around the world and receive foreign doctors for training here.

Measuring Radiation
Let's measure some radiation! Radiation is invisible, odorless, makes no sound, and cannot be perceived by the skin. So how can we measure it?
We use the changes that take place when certain substances are exposed to radiation. Most of the effects of radiation are either (1) ionization effects by which electrons are pulled away from matter, (2) flourescent effects in certain substances, (3) and photosensitive effects, as in film exposure. In measuring radiation, the most common methods use (1) the ionization effect. In fact, the Lauritsen electroscope used in this display and the permanent cloud chamber that allows us to see the tracks of radiation particles both rely on ionization.
  Permanent Wilson Cloud Chamber Courtesy of Corporation RADO
This box utilizes radiation ionization to show the particle tracks of background radiation (mainly cosmic rays). When radiation enters the box, it contacts the atoms of air components, causes their electrons to collide, absorb a positive charge, and ionize. The surrounding vaporized alcohol molecules collect on the nuclei of the ionized air and turn into tiny droplets. When enough of these collect, they become a visible cloud. Thus, the track of radiation that has entered the box becomes visible as a cloudy trail.

(The box is showed until the end of August.)
  "It was an atomic bomb."
- A History of A-bomb Investigations -

 *Atomic Physics and Radiation Research in Japan on the Eve of the Bombing
 *The Great Tragedy: a "New Type of Bomb" Out of the Blue
 *First surveys: looking through the confusion to confirm an "atomic bomb"
 *Damage surveys in the post-war turmoil
 *The Special Committee for the Investigation of A-bomb Damages
and Japan-US Joint Commission

 *A-bomb documentary film by Japan Film Corporation
 *A-bomb Investigations after the Occupation
 *The Role of A-bomb Research Today

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