DEVELOPMENTS OF CADMIUM SULFIDE CRYSTALS AT THE INSTITUTE FOR MEDICINE AND BIOLOGY BERLIN-BUCH

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00810A003700230003-3
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 1
• Document Creation Date: December 21, 2016
• Document Release Date: April 10, 2009
• Sequence Number: 3
• Publication Date: March 9, 1954
• Content Type: REPORT

Approved For Release 2009/04/10: CIA-RDP80-00810A003700230003-3.,,
A0Y REPQ,RT
I F ORM N REPORT DD N.Q.
COUNTRY East Germany DATE DI$TR. 9 March 1954
SUBJECT Development of Cadmium Sulfide Crystals at NO. OF PAGES 1
the institute for Medicine and Biology, Berlin-Buch
PLACE
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OF THE UHI STAVES, WITHIN THE MEANING OF TITLE 18,_SE CTIONS 793
AND 754. OF THE U. S. CODE. AS AMENDED. ITS TRANSMISSION OR REVEL-
NO. OF ENCLS.
(LISTED BELOW)
SUPPLEMENT TO
REPORT NO.
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THIS IS UNEVALUATED INFORMATION
the A' Institute for T1edicine and
Krummbiegel (fnu) in the laboratory of Dr. Liselott Herforth. The
crystals are produced by vaporizing cadmium in hydrogen sulfide at a
temperature of 1,0000 Centigrade.
Biology in Berlin-Ruch is working on the development of cadmium sulfide
crystals for X-ray dosimetry. The work is being carried out by Physicist
2. Two methods of crystal activation are used:
a. Fine silver is vaporized at the same time that the cadmium is
exposed to the hydrogen sulfide stream. The silver diffuses into
the crystals and ultimately improves their conductivity.
b. The finished crystals are tempered at a temperature between 500
and 6000 Centigrade with addition of fine silver.
Experiments carried out thus far seem to indicate that method b.
furnishes better results than method a. It is expected, however, that
the experiments will have to be continued for a period of six more
months before an ultimate decision on the preferability of either of
the two methods can be reached.
Before the crystal is exposed to an X-ray source it is inserted into a
circuit so that a voltage between 10 and 40 Volts is laid on the crystal.
Higher voltages make the crystal unworkable. The voltage has to be
gradually increased from 10 to a maximum of 40 Volts. The current must
not exceed 200 micro-amperes because higher currents also make the
crystal unuseable. The initial X-ray doses to which the crystal is
exposed must be weak; later doses are gradually increased.
STATE
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1-M my. x_ All Approved For Release 2009/04/10: CIA-RDP80-0081 OA003700230003-3