PRODUCTION OF NEW TYPES OF DOSIMETERS AT VEB ENTWICKLUNG-UND FERTIGUNG ELEKTRISCHER MESSINSTRUMENTS (EFEM) FOR THE USSR

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP83-00418R003100120003-0
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 20, 2016
• Document Release Date: November 13, 2007
• Sequence Number: 3
• Publication Date: March 1, 1956
• Content Type: REPORT

This material contains Inforsitatson electing the National Defense of the United States within the meaning of the Espionage Laws, Me
18, U.S.C. Sen. 7g7 and 7M, the trea?ISSIOn or revelation of which In any manner to an unauthorized person Is prohibited by law.
S-E-C-R-E-T
NOFORNI~
DATE OF INFO.
PLACE ACQUIRED
DATE ACQUIRED
Production of New Types of
Dosimeters at VEB Entwicklung-
und Fertigung elektrischer
Messinstrumente (EFEM)for the USSR
REPORTI
DATE DISTR. 1 March 1956
NO. OF PAGES 3
REQUIREMENT NO. RD
REFERENCES
1. The MO and KL instruments built by VEB EFEM to Russian specifications
(and which have been the subj1ct of previous reports) will not be made
in the same form during 1956.
2. As previously reported, the original program was for the supply of
2,500 MO and 1,500 KL instruments, with 300 ionization chambers for each
MO instrument. 2 By the middle of January 1956, 800 MO and 1,000 EL
instruments will have been delivered to the USSR. Production of these
two sets will now cases, as they have been further developed by EFEM
technicians with such success that the production of sets of new types
can now start. The new equipment will be manufactured with the following
designations:
K5/49-1 - Integral dosimeter (formerly MO)
K5/49-2 - Pocket dosimeter (formerly KL)
3. K5/49-l Integral Dosimeter
Technical specifications for the further development of the integral
dosimeter were as follows:
a. Tg
Development of an integral dosimeter to observe the health of
persons in areas exposed to the dangers of radiation. The equip-
ment is for measuring xoentgen and gamma rays, and works on the
principle of ionization chamber discharge. It is to indicate
the amount of radiation and to measure the voltage. Static
electrometers will be used as the measuring instruments. The
instrument to be developed is for mass observation; it is to omsist
of a conveniently large number of simple portable ionization chambers
and a measuring desk for registering their charges.
x1 Fu I I AEC Ix IOSIft x I
(Novi Washington distribution Indicated by "X"1 Field distrlbtdoa
 b. Technical Specification:
(1) The equipment is to consist of
(a) a charge metering desk (Lademesspult), standing during
use on a firm horizontal base; and
(h) a large number of light ionization chambers carried
during work by those under observation. The chambers
must not impede their movements.
(2) The equipment is to register radiations up to 50 r and, with
the admissible dose 0.3 r, provide a clearly legible deflection.
(1 roentgen - r, corresponding to a charge of 0.33. 10 - k/sec
in 1 cu.cm. air).
(3) It must provide for successive observations with approximately
300 measurements per hour. It must be easy to handle for taking
measurements and suitable for issuing on loan. Charging of the
ionization chambers must be effected without a mains or battery
power supply.
(4) The charge metering desk must operate perfectly in temperatures
ranging from -10? to +40?C, and the ionization chambers
down to -25?C.
Margin of Permissible Error
At temperature ranging from 20 * 5?C, and relative atmospheric
humidity of 80 , the permissible error must not be more than 10%
and should be substantially less. With change of temperature in the
ionization chambers up to + 40?C, the additional measurement errs
must not exceed 0.5% per ?C. With changes djwn to -25?C, the addl..
tional error must not exceed 1% per ?0. The, equipment must remain
serviceable after being exposed to temperatures between 20?'t 5?C, and
to relative atmospheric humidity of 98%. The ionization chambers
must be able to withstand without damage a fall to the ground from a
height of 1.50 m. The automatic discharge of the ionization chambers
from insulation losses should not exceed 3% per 24 hours (i.e., a
minimum time constant of 10 seconds).
Development of an instrument for use during special work in
irradiated areas. This instrument is to combine the charging and
measuring equipment and the ionization chambers in one piece. The old
Soviet KL instrument had to be carried with a support and was strapped
on to the chest. The new instrument is approximately 20 mm. in
diameter and 80 mm. in length, and is carried in the coat pocket
like a fountain pen. The advantages of the new equipment lie in
the fact that it is considerably smaller, easier to handle, and, at
the same time, more robust. The principle of the set is similar to
 that of a gold leaf electroscope. The measuring mechanism consists
of a copper wire loop containing a silvered quartz thread about 7 /~
thick. Static electricity is produced by friction on the body or/
some other organic substance. A field is thus created in the loop, which
repels the quartz thread. If this instrument, in a charged condition,
is exposed to irradiated air, the air in the chambers is ionized and
the displaced quartz thread takes up its initial position. From
maximum deflection to the original position a measurement is produced,
which may be read on a scale calibrated in roentgens. The tele-
scopic principle is used for the apparatus on account of its small
size and the small quantity of light.
The apparatus must need no additional equipment for charging and
measurement. It must be possible to read off measurement values in
very poor light. The measurement ranges will be from 0 to 0.3 r and
0 to 20 r; one type of instrument is envisaged for each range.
c. Margin of Permissible Error
The margin of permissible error on the indicator must not exceed t
10% and should be substantially less. The instrument must work perfectly
in a relative, atmospheric humidity of 98%, under air prssure between
500 and 800 Tor (Torricelli unit = mm. of mercury), and at temperatures
between -30? and }50?C. The instrument must be able to withstand a fall
from a height of 1.50 m. to the around or a wooden floor. The
automatic discharge of the ionization chambers from insulation losses
must not exceed 3% in 24 hours.
Comments 11,500 VT dosimeters were
ordered by the USSR and 100 by East Germany; 500 MC diedmeters were
ordered by the USSR, and 100 by East Ge:-many; and 30,000 ionization
,000 n dosimeter; and 500 MO dosimeters were to be delivered
to the USSR.