1. |
A Simplified High Sensitivity Photometer or Exposure Meter for Photographic Enlarging |
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Review of Scientific Instruments,
Volume 11,
Issue 5,
1940,
Page 159-160
Walter van B. Roberts,
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PDF (109KB)
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ISSN:0034-6748
DOI:10.1063/1.1751670
出版商:AIP
年代:1940
数据来源: AIP
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2. |
Luminous and High Resolving Universal X‐Ray Spectrograph |
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Review of Scientific Instruments,
Volume 11,
Issue 5,
1940,
Page 160-164
E. Ingelstam,
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PDF (351KB)
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摘要:
A universal spectrograph combining the concave‐crystal methods by internal and external reflection has been constructed. The crystal employed covers the wave‐length domain 0–2300 x.u. The aim was to get a convenient instrument suitable for rapid work. Direct wave‐length reading is possible. Technical improvements in the crystal holder have been made.
ISSN:0034-6748
DOI:10.1063/1.1751671
出版商:AIP
年代:1940
数据来源: AIP
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3. |
Admission of Pure Gases to Vacuum Systems |
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Review of Scientific Instruments,
Volume 11,
Issue 5,
1940,
Page 164-166
E. Leonard Jossem,
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PDF (189KB)
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ISSN:0034-6748
DOI:10.1063/1.1751672
出版商:AIP
年代:1940
数据来源: AIP
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4. |
The Application of the Method of Coincidence Counting to Experiments in Nuclear Physics |
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Review of Scientific Instruments,
Volume 11,
Issue 5,
1940,
Page 167-180
J. V. Dunworth,
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PDF (928KB)
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摘要:
The paper describes the principles involved in the application of coincidence counting to problems in nuclear physics, and gives details of the various methods of approach to the solution of nuclear level schemes, with some of the difficulties encountered. It is shown that the maximum source strength which can be used is inversely proportional to the coincidence resolving time and that the method of experiment has the great advantage over most other methods in that it can be used with very weak sources (sources having an activity of about 10−5millicurie). An accurate knowledge of the absolute net efficiency of a Geiger counter for all types of radiation is required in the interpretation of the coincidence rates, and the method of achieving this at the same time as information is obtained about nuclear level schemes is explained. Further, it is pointed out that the method makes possible a simple and rapid determination of the total energy of disintegration of &bgr;‐radioactive nuclei and therefore of the mass differences between parent and daughter nuclei.
ISSN:0034-6748
DOI:10.1063/1.1751673
出版商:AIP
年代:1940
数据来源: AIP
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5. |
Note on a D.C. Amplifying Microammeter |
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Review of Scientific Instruments,
Volume 11,
Issue 5,
1940,
Page 181-182
Lawrence M. Langer,
Franz N. D. Kurie,
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ISSN:0034-6748
DOI:10.1063/1.1751675
出版商:AIP
年代:1940
数据来源: AIP
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6. |
Amplifier Voltage Supply |
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Review of Scientific Instruments,
Volume 11,
Issue 5,
1940,
Page 182-182
E. G. Witting,
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PDF (63KB)
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ISSN:0034-6748
DOI:10.1063/1.1751676
出版商:AIP
年代:1940
数据来源: AIP
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