diode cross
Inventory Number2025-04-0001
Classification(not assigned)
Maker
Harvard Cyclotron Laboratory
1937 - 2002
User
Francis H. Burr Proton Therapy Center, Massachusetts General Hospital
founded 2001
User
Ethan W. Cascio
born 1960
Description32x32 "CROSS" diode array built for QA in the HCL radiosurgery beam and later used for general purposes at the Burr center. 1N4004 diodes are mounted on perfboard at 0.2" pitch. Leads not at ground are covered with insulating paint to discourage ion collection. The diodes put out so much signal (130 pC/rad) that they will not reach the 10 Krad damage threshold in the lifetime of the device, so they are not pre-irradiated
ProvenanceHarvard Cyclotron Laboratory, Cambridge, MA, 1960s-2002; The Francis H. Burr Proton Therapy Center at Massachusetts General Hospital, Boston, 2002-2021; transfer to CHSI, 2021.
Radiation Instrument Development Laboratory
Date: 1960-1965
Object number: 2003-1-0301
Sylvania Products Company
Date: circa 1943
Object number: VT0722
Harvard Cyclotron Laboratory
Date: 1947-2002
Object number: 2003-1-0291
Raytheon Manufacturing Company
Date: circa 1935
Object number: VT0100
American
Date: 1960-1980
Accessories: commodore video monitor (2003-1-0239b); magnetic temperature monitor (2003-1-0239c); pulse timer (2003-1-0239d); Commodore computer, keyboard (2003-1-0239e); Panasonic dot-matrix printer (2003-1-0239f); two cyclotron lead bricks (2003-1-0239g, h); cardboard box with printer paper (2003-1-0239i)
Object number: 2003-1-0293a
Sylvania Electric Products, Inc
Date: 1943-1948
Object number: VT0116
Bowmar/Ali Inc.
Date: circa 1974
Accessories: black imitation leather carrying case with perimeter zipper; power supply cord attached to transformer plug
Object number: 1990-7-0003
Raytheon Manufacturing Company
Date: 1933
Object number: VT0105
