C00021867

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SUBJECT: Soviet Microwave Permissible Doses

I requested that F Iprovide him with the latest possible Soviet figures for tha maximum permissible does levels of microwave radiation. He gave his figures for the Soviet limits as l0 microwatts per square centimeter for continuous exposure, 1oo microwatts per square centimeter for two-hour exposure or so-called periodic exposure, and one milliwatt per square centimeter for 20 minutes also periodic exposure.. These data were given in a 1958 Ministry of Health, USSR, regulation.

2. A search of recent literature indicates that by and large most Soviet investigators stiil utilize the Ministry of Health-Z. V. Gordon figures which are quoted above. They generally compare these with the U.S. stated figures of l0 milliwatts. All of these limits are given for the centimeter range microwaves since 10 centimeter waves seem to be the most damaging to biological tissue. In a recent issue of the Military Medical Journal (Voyenno-Meditsinskiy Zhurnal) 9 for 1964, pages 22-26, there appeared a new set of values for Soviet permissibie limits. Again these figures are for centimeter range microwaves. They are: 10 microwatts per square centimeter for 8-hour day continuous exposure; lo0 microwatts per square certimeter for two hours maximum periodic exposure; ant ne milliwatt per square centimeter for 12-5 minutes maximum with goggle protection for. the eyes. These figures are taken from a 1959 Ministry of Health publication the title of which is Vremennyye Sanitarnyye Pravila Pri Rabote s Generatorami Santimetrovykh Voln.

U6O

C00021867'

27 October 1965

MEMORANDUM FOR THE RECORD

[PAGE 3]
SUBJECT: Soviet Microwave Permissible Doses

3. I believe that these later figures are still in force for the USSR. We will notify D if we find any change in an official Soviet publication.

C00021867