Drawing Back the Curtain of Secrecy

APPENDIX C

PARAGRAPH 5 OF THE 1956 JOINT AEC/DOD CLASSIFICATION GUIDE

SUBJECTCLASSREMARKS
a. Yields
1) Developmental and test weapons or devices are classified except as follows:
a) Sandstone, Trinity, Hiroshima, Nagasaki, Crossroads, and Ivy MikeUThe number 1 or nearest whole number multiple of 10 or 100, i.e. 1Kt, 10Kt, 20Kt, etc., 100Kt, 200Kt, 300Kt, etc.
2) Hypothetical yieldsUA hypothetical yield is any yield not identifiable with an actual detonation, weapon or device. (See 4a for limitation and exceptions.)
b. Thermal Phenomena
1) Mathematical expressions of graphical presentations resulting from a compilation of thermal data as a function of hypothetical yield.U
a) Shape of radiate pulse
b) Thermal yieldU
2) Incidental thermal radiation energy at a given distance for a hypothetical yieldU
3) Existence of, and circuitry used in devices such as bhangmetersU
c. Fireball characteristics
1) Mathematical expression or graphical presentations resulting from a compilation of fireball data as a function ofhypothetical yieldU
a) Maximum fireball radius
b) Radius of fireball related to time for scaled timeU
d. Bomb clouds and columns
1) Cloud chamber effectsUExcept when related to yields
2) Base surge U
a) Gamma intensity vs. time (after 0.01 seconds from detonation), integrated dose and effective energy spectrumU
b) Neutron total dose (rad or rem)UIt is permissible to indicate "high," "medium," or "low" neutron yield detonation.
c) Neutron dose as a function of energy spectrum as measured by activation, threshold and fission detectors havingthresholds 3 Mev or below.UUnclassified for unboosted fission weapons only.
d) Neutron induced activity as determined by type or composition of exposed material.U
e) Character and degree of attenuation, scattering or absorption in various mediaU"Clean" and "salted" weapons or devices will not be included.
f. Radioactive Fall-out
1) Mathematical expressions or graphical presentations resulting from a compilation of radioactive fall-out or residual radiation data as a function of hypothetical yield and burst conditionsU
a) Pattern
b) Iso-intensity and iso-dose contours, total activity, residual radiation energy spectrum, or decay rateU
(1) For fission weapons, devices or detonations.
c) Beta to gamma ratioU
g. Blast and Shock Phenomena
1) Mathematical expressions or graphical presentations resulting from a compilation of blast and shock data as afunction of distance and hypothetical yield.Provided height of burst or depth of burst is not specified.
a) Peak overpressureU
b) Peak dynamic pressureU
c) Time of arrival of shock frontU
d) Positive phase duration of overpressure and dynamic pressureU
e) Peak density or peak material velocityU
f) Mach characteristics and height of triple pointU
g) Overpressure and dynamic pressure impulseU
h) Crater dimensions for surface burstsU
I) Variation of crater dimensions with depth of burst as obtained from unclassified TNT dataU
2) Partition of energy
a) In air, below 15,000 feet MSLUAs among thermal, visible, nuclear radiation, and shock
3) Precursor and related phenomena
a) The word "precursor" when used in connection with atomic weapons phenomena or effectsU

APPENDIX D

NUCLEAR WEAPONS STOCKPILE DATA TABLE

YEARTOTALMEGATONAGEBUILDSRETIREMENTSDISASSEMBLIES
194520.0420
194690.1870
1947130.2640
1948501.25436
19491704.191233
19502999.53264135
195143835.25284145
195284149.95644241
1953116972.8034517
19541703339.015351
195524222879.9980687
195636929188.651379109
1957554317545.862232381
1958734517303.542619817
19591229819054.6270882135
19601863820491.177178838
19612222910947.7151621571
196212825.024529766
196315977.173185830
196416943.9734932534
196515152.5035191936
196614037.4624292357
196712786.1716931649
196811837.655362194
196911714.446843045
19709695.202191936
19718584.4010731347
19728531.5115461541
19738452.001171544
19748325.22959807
19757368.387482240
19765935.514272181
19775845.00221998
19785721.16501148
19795696.34170730
19805618.860904732
19815832.913018871577
19825358.8933815371535
19835232.472177491120
19845192.201871143994
19855217.4819513221075
19865414.5414012241015
19874882.1409581189
19884789.7701023581
19894743.34017941208
19904518.911154
19913795.941595
19923167.881856
19932647.311556
19942375.30926 as of April

Table of Contents
Next Section