physics

Nihon Hidankyo

Nihon Hidankyo is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Nihon Hidankyo rather than just read about it. In short: The Japan Confederation of A- and H-Bomb Sufferers Organizations, often shortened to Nihon Hidankyō (日本被団協, Nihon Hidankyō), is a group that represents survivors (known as hibakusha) of the atomic bombings of Hiroshima and Nagasaki. It was formed in 1956.

Key takeaways

Nihon Hidankyo belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Nihon Hidankyo to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Nihon Hidankyo from memory before moving on to harder problems.

Reference excerpt

The Japan Confederation of A- and H-Bomb Sufferers Organizations, often shortened to Nihon Hidankyō (日本被団協, Nihon Hidankyō), is a group that represents survivors (known as hibakusha) of the atomic bombings of Hiroshima and Nagasaki. It was formed in 1956. Nihon Hidankyō lobbies both the Japanese government for improved support of the victims and governments worldwide for the abolition of nuclear weapons. Their activities included recording thousands of witness accounts, issuing resolutions and public appeals, and sending annual delegations to various international organisations, including the United Nations, to advocate for global nuclear disarmament. The organisation was awarded the 2024 Nobel Peace Prize "for its efforts to achieve a world free of nuclear weapons and for demonstrating through witness testimony that nuclear weapons must never be used again".

History

Nihon Hidankyo is a nation-wide organisation formed by survivor groups of atomic bomb victims from Hiroshima and Nagasaki in each prefecture. The fallout from Castle Bravo, a thermonuclear weapon test conducted at Bikini Atoll by the United States in 1954, caused acute radiation syndrome in residents of neighbouring atolls and 23 crew members of the Japanese fishing vessel Daigo Fukuryū Maru. This led to the formation of the Japan Council against Atomic and Hydrogen Bombs in Hiroshima the following year. Inspired and supported by this movement, atomic bomb survivors established Nihon Hidankyo on 10 August 1956, at the second annual conference of the council in Nagasaki.

However, the movement's solidarity was jeopardised when the council became actively involved in the anti-U.S.-Japan Security Treaty movement alongside the left-leaning Japan Socialist Party in 1959. A large number of supporters withdrew from the council, and with the support of the conservative Liberal Democrats, a new organisation, led by Masatoshi Matsushita, leader of the staunchly anti-communist Democratic Socialist Party, was established. In 1961, when the Soviet Union resumed nuclear tests, the communist wing of the council refused to denounce them, which led to severe internal tension. This led to a further split in the movement, with a Japan Socialist Party-backed group that denounces nuclear tests by any nation breaking away as a new council. These tensions within anti-nuclear movements caused some prefectural Hidankyos to split at the local level as well, such as in Hiroshima, where there are both Socialist Party-backed and Communist Party-backed Hidankyos with the same name. The nationwide organisation itself decided not to align with any political movements in 1965, after they became highly politicised.

Activities As of October 2024, Nihon Hidankyo's activities include:

Advocacy for the abolition of nuclear weapons and demands for state compensations Petitioning actions towards the Japanese government, the United Nations and other governments Elimination and removal of nuclear weapons, establishment of an international treaty for nuclear disarmament, holding of international conferences, enactment of non-nuclear laws and enhancement of hibakusha support measures Raising awareness of the realities of the atomic bombings both domestically and internationally Research, study, publication, exhibitions and gatherings on atomic bomb damage Consultation and support activities for hibakusha

Key figures

Current officials

Co-chairs Terumi Tanaka: Exposed to radiation 3.2 km away from the Nagasaki hypocentre at the age of 13; assumed office on 14 June 2017 Shigemitsu Tanaka: Exposed to radiation 6 km away from the Nagasaki hypocentre at the age of 4; assumed office on 14 June 2018 Toshiyuki Mimaki: Exposed to radiation at his home in Hiroshima at the age of 3; assumed office on 9 June 2022

Secretary general Sueichi Kido: Exposed to radiation in Nagasaki at the age of 5; assumed office on 7 June 2017

Assistant secretaries general Toshiko Hamanaka Jiro Hamasumi Michiko Kodama Masako Wada

Former officials Ichiro Moritaki: Founding chairperson of Nihon Hidankyo. Founding chairperson of the Hiroshima Prefectural Hidankyo, a committee head of the Atomic Water Association, and the third chairperson of the Japan National Conference on the Prohibition of Atomic and Hydrogen Bombs. Died January 25, 1994. Sumiteru Taniguchi: Severely injured by the Nagasaki bomb 1.8 km away from the hypocentre at the age of 16; co-chairperson until his death on 20 August 2017 Takeshi Ito: Born in Hiroshima City. Ito was exposed to the atomic bomb during his third year at the former Hiroshima Prefectural First Middle School; co-chairperson until his death on 3 March 2000. Sunao Tsuboi: Severely injured by the Hiroshima bomb 1.5 km away from the hypocentre at the age of 20; co-chairperson until his death on 24 October 2021 Mikiso Iwasa: Severely injured by the Hiroshima bomb at his home 1.2 km away from the hypocentre at the age of 16; co-chairperson until his death on 7 September 2020

Honors 2003: Seán MacBride Peace Prize 2010: Award for Social Activism from the World Summit of Nobel Peace Laureates 2024: Nobel Peace Prize Before being awarded the Nobel Peace Prize, Nihon Hidankyo was also nominated in 1985, 1994 and 2015 by the Swiss-based International Peace Bureau.

Illustrations

Worked examples

Example 1 — a first encounter with Nihon Hidankyo

Start with the simplest possible case. Write down what Nihon Hidankyo claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Nihon Hidankyo before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Nihon Hidankyo ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Nihon Hidankyo

In research: Nihon Hidankyo appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Nihon Hidankyo in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Nihon Hidankyo is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1956 establishments in Japan, Anti-nuclear organizations, Anti–nuclear weapons movement, so understanding it makes those chapters shorter.
In everyday life: Look for Nihon Hidankyo outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Nihon Hidankyo in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Nihon Hidankyo means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Nihon Hidankyo out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nihon Hidankyo in simple terms?

Why does Nihon Hidankyo matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Nihon Hidankyo?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Nihon Hidankyo.