Range Measurement of Low-Voltage Electrons

Davis, Marguerite

doi:10.1103/physrev.94.243

Cited by 40 publications

(3 citation statements)

References 4 publications

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“…The electron ranges given in Table I are approximately the average between those obtained experimentally by Davis (13) and those calculated by Lea (14). The former author has discussed the question of electron ranges in biological material in considerable detail (7, 8, 13), as has also Preiss (4, 5).…”

Section: Resultssupporting

confidence: 69%

“…Now the only entities on the discs which we can be sure have uniform structures are the virus particles themselves. From these considerations it is reasonable to conclude that (a) all virus particles have a shielding Electrons/cmz X [10][11][12][13] Effect of irradiating vaccinia virus with 2500 volt electrons (penetration to 1750 A) and 5000 volt electrons (penetration to 5700 A). These are the averages of those obtained experimentally by Davis(13) and those calculated by Lea(14).…”

Section: Discussionmentioning

confidence: 99%

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Physical Studies on Pox Viruses

McCrea¹,

Preiss²,

O'Loughlin³

1960

Biophysical Journal

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Vaccinia virus was irradiated in vacuo with low-voltage electrons of restricted ranges. It was found that the pock-forming ability of the virus was not decreased after bombardment with electrons penetrating 100 A beneath the virus surface. There was very slight reduction in titer with large doses of electrons penetrating 330 A, but a sudden marked drop in infectivity occurred after exposure to electrons penetrating 500 to 700 A. Electrons of higher energies, including those capable of penetrating the virus particle completely, did not produce significant further fall in infectivity titer. It is concluded that a highly radiation-sensitive unit essential for pock formation is situated 500 to 700 A beneath the surface of the virus particle, possibly in the form of a shell. The relation of this finding to the known structure of the virus and to other radiation data on the dimensions of the infectious unit is discussed.

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Section: Resultssupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Physical Studies on Pox Viruses

McCrea¹,

Preiss²,

O'Loughlin³

1960

Biophysical Journal

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show abstract

“…The unique feature of such an apparatus is that it employs electrons of known energies and, consequently, of known depths of penetration. These depths have been determined experimentally by bombarding dry enzymes in films of known thickness (Davis, 1954) and have also been calculated theoretically (Lea, 1947). The voltages used in our experiments varied from 500 (range approximately 100 A) to 5000 (range approximately 6000 A).…”

Section: Low-energy Electronsmentioning

confidence: 99%