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contemplated for production.
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New theories and new designs must be tested

in the laboratory or in the field to prove their performance before produc-

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tion can be prudently begun.

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- but, it is equally essential in the armaments field.

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A superior weapons

capability is not an objective which can be once gained and therafter

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This is obvious in the aeronautical field

This 1s apparent if viewed in terms of

fantliar objects such as radio, television, chemistry and transportation.

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Likewise, in every phase of weapons capability, constant efforts toward

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improvement have to he made to produce desired results at less cost in

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terms of weight, space, money or hazards to operating personnel.
; Nuclear weapons are an extremely important component of our total

weapons capability which is regarded as the principal deterrent to any
aggression against our national security or the security of the free

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world.

ment is necessary to maintain the effectiveness of that deterrent.
The effects of blast, heat, and immediate nuclear radia&:ion from
a nuclear weapon test are localised within the testing areas.

However,

some of the radioactive debris produced does get into the atmosphere,

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Continued testing of nuclear weapons to ensure continued improve-

is spread by winds, and gradually falls to the surface.
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The most bio-

logically important substance found in this fallout is radioactive
slsontiun.

Since the start of nuclear tests, careful measurements have

been made of the distribution of this material over the earth's surface,
in all forms in which it might be expected to occur.
this study are reassuring.

‘he résults of

The amount of radioactive strontium now present
in the

“RUVUYGIT YAIMONNSASIO "da ZHDIM

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