# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/hans-geiger
# Generated: 2026-09-07T20:20:42.380Z

schema: https://schema.org/Person
url: "https://fame.am/person/hans-geiger"
name: "Hans Geiger"
slug: "hans-geiger"
description: "He built the machine that clicks faster the closer you get to danger — a handheld oracle for invisible threat. But before that counter made his name a verb, Geiger fired particles at gold foil and found the atom had a heart."
tagline: "German physicist (1882–1945)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Hans_geiger.jpg"
gender: "male"
country:
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  isoCode: "DE"
category:
  name: "Scientists"
  slug: "scientists"
profileType:
  name: "Scientist"
  slug: "scientist"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1882-09-30"
deathDate: "1945-09-24"
livingStatus: "DECEASED"
scores:
  popularity:           53.75
  momentum:             0
  historical:           22.17532
  currentAttention:     0
  sourceConfidence:     60
  profileCompleteness:  70
  trendDirection:       "STABLE"
ranks:
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  country:  null
  category: null
tags:
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  - name: "Scientist"
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  - name: "Physics"
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  - name: "Science"
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  - name: "Germany"
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  - name: "20th Century"
    slug: "20th-century"
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# bio (long form, separated for readability)
bio: |
  Johannes Wilhelm Geiger was born 30 September 1882, a German experimental physicist who would give radiation a voice. He carried out the Rutherford scattering experiments — firing particles at gold foil, expecting them to pass through, watching them ricochet — and in that deflection found proof of the atomic nucleus. Later he invented the Geiger counter, the device that turns ionizing radiation into audible warning. He also performed the Bothe–Geiger coincidence experiment, confirming that energy holds its ground even when light meets particle. His brother Rudolf charted weather and climate; Hans charted the invisible. He died 24 September 1945, six days short of sixty-three.