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James Van Allen journal, 1951?-December 1954

Page 30

Cosmic Ray Meeting at Oxford
  March 11-12, 1950
[ONE report by [T? J?]. Coor]

N. [Barford? Banford? Bamford?]
Imperial College, London

Mean free path for absorption of star producing radiation in various materials

{ material } { M.F.P. (observed)}
-----------------------------------------------
{ Air } { 135-150 g/(cm exponent 2) }
{ Pb } { 300-310 g/(cm exponent 2) }
{ C } { 103 g/(cm exponent 2) }
{ Ice } { 135 g/(cm exponent 2) }
{ Al } { 220 g/(cm exponent 2) }

sigma  ~ (1/2)(sigma sub geo).
----------------------------------------------------------------------
"Progress Report on Bumper Vehicle
Report Number R 50A0501
Project Hermes                    (February 1950)
General Electric     ([confidential? conference?])    R. P. Haviland

{   7550 feet / second     (5150 miles / hour)
{   242 miles above earth's surface
24 February 1949   W.S.P.G.     Bumper [7?]
1514 MST
----------------
Bumper VI      21 April 1949
V-2 Failure
A.[P? D?].L. Jenkins
Single counter [rcpe?]

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Cosmic Ray Meeting at Oxford March 11-12, 1950 [ONE report by [T? J?]. Coor] N. [Barford? Banford? Bamford?] Imperial College, London Mean free path for absorption of star producing radiation in various materials { material } { M.F.P. (observed)} ----------------------------------------------- { Air } { 135-150 g/(cm exponent 2) } { Pb } { 300-310 g/(cm exponent 2) } { C } { 103 g/(cm exponent 2) } { Ice } { 135 g/(cm exponent 2) } { Al } { 220 g/(cm exponent 2) } sigma ~ (1/2)(sigma sub geo). ---------------------------------------------------------------------- "Progress Report on Bumper Vehicle Report Number R 50A0501 Project Hermes (February 1950) General Electric ([confidential? conference?]) R. P. Haviland { 7550 feet / second (5150 miles / hour) { 242 miles above earth's surface 24 February 1949 W.S.P.G. Bumper [7?] 1514 MST ---------------- Bumper VI 21 April 1949 V-2 Failure A.[P? D?].L. Jenkins Single counter [rcpe?]