Milestone-Proposal:The 20 inch Diameter Photomultiplier Tubes
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Is the achievement you are proposing more than 25 years old? Yes
Is the achievement you are proposing within IEEE’s fields of interest? (e.g. “the theory and practice of electrical, electronics, communications and computer engineering, as well as computer science, the allied branches of engineering and the related arts and sciences” – from the IEEE Constitution) Yes
Did the achievement provide a meaningful benefit for humanity? Yes
Was it of at least regional importance? Yes
Has an IEEE Organizational Unit agreed to pay for the milestone plaque(s)? Yes
Has an IEEE Organizational Unit agreed to arrange the dedication ceremony? Yes
Has the IEEE Section in which the milestone is located agreed to take responsibility for the plaque after it is dedicated? Yes
Has the owner of the site agreed to have it designated as an Electrical Engineering Milestone? Yes
Year or range of years in which the achievement occurred:
1979 - 1987
Title of the proposed milestone:
The 20 inch Diameter Photomultiplier Tubes, 1987
Plaque citation summarizing the achievement and its significance:
The 20 inch Diameter Photomultiplier Tubes, 1979 – 1987
In 1979, Hamamatsu Photonics K.K. started developing 20 inch diameter photomultiplier tubes at the Toyooka Factory for the Cherenkov radiation detector Kamiokande II which was equipped with 948 tubes with gain of 107. It detected the neutrino burst in the Supernova SN1987A in 1987, and brought the Nobel Prize to Professor Masatoshi Koshiba in 2002 opening a new window of the Astrophysics.
In what IEEE section(s) does it reside?
IEEE Nagoya Section
IEEE Organizational Unit(s) which have agreed to sponsor the Milestone:
IEEE Organizational Unit(s) paying for milestone plaque(s):
IEEE Organizational Unit(s) arranging the dedication ceremony:
IEEE section(s) monitoring the plaque(s):
Please note: your email address and contact information will be masked on the website for privacy reasons. Only IEEE History Center Staff will be able to view the email address.
Street address(es) and GPS coordinates of the intended milestone plaque site(s):
The address of the milestone plaque site is: HAMAMATSU PHOTONICS K.K. Electron Tube Division Toyooka Factory 314-5, Shimokanzo, Iwata City, Shizuoka Prefecture, Japan (Iwata City is located next to Hamamatsu City.) GPS coordinates: 34 48” 47. 1” N
137 50” 10. 0” E
Milestone Plaque-Replica 1: Kamiokande II Kamioka Observatory, Institute for Cosmic Ray Research Mozumi Mine of the Kamioka Mining and Smelting Co. Hida City, Gufu Prefecture, Japan
Describe briefly the intended site(s) of the milestone plaque(s). The intended site(s) must have a direct connection with the achievement (e.g. where developed, invented, tested, demonstrated, installed, or operated, etc.). A museum where a device or example of the technology is displayed, or the university where the inventor studied, are not, in themselves, sufficient connection for a milestone plaque.
Please give the address(es) of the plaque site(s) (GPS coordinates if you have them). Also please give the details of the mounting, i.e. on the outside of the building, in the ground floor entrance hall, on a plinth on the grounds, etc. If visitors to the plaque site will need to go through security, or make an appointment, please give the contact information visitors will need.
Are the original buildings extant?
Details of the plaque mounting:
The plaque will be placed on a plinth of the grounds near the front entrance gate of the Toyooka Factory.
How is the site protected/secured, and in what ways is it accessible to the public?
The factory is surrounded by a fence, but the front gate is kept open during the daytime. Visitors can go to the plaque site without going through the security during the daytime.
Who is the present owner of the site(s)?
HAMAMATSU PHOTONICS K.K.
A letter in English, or with English translation, from the site owner(s) giving permission to place IEEE milestone plaque on the property:
A letter or email from the appropriate Section Chair supporting the Milestone application:
What is the historical significance of the work (its technological, scientific, or social importance)?
What obstacles (technical, political, geographic) needed to be overcome?
What features set this work apart from similar achievements?
References to establish the dates, location, and importance of the achievement: Minimum of five (5), but as many as needed to support the milestone, such as patents, contemporary newspaper articles, journal articles, or citations to pages in scholarly books. At least one of the references must be from a scholarly book or journal article.
Supporting materials (supported formats: GIF, JPEG, PNG, PDF, DOC): All supporting materials must be in English, or if not in English, accompanied by an English translation. You must supply the texts or excerpts themselves, not just the references. For documents that are copyright-encumbered, or which you do not have rights to post, email the documents themselves to firstname.lastname@example.org. Please see the Milestone Program Guidelines for more information.