Difference between revisions of "neutron detector"

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m (Created page with 'Category:Engineering GM pancake detector enclose in lead box. 5 cm diameter GM pancake detector window is exposed. A 20 cm long 5 cm internal diameter Aluminum tube wrappe…')
 
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[[Category:Engineering]]
 
[[Category:Engineering]]
  
GM pancake detector enclose in lead box.
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A Geiger–Müller pancake detector enclosed in lead box. This is the '''GM detector'''. Typically has a 5 CM diameter window.
  
5 cm diameter GM pancake detector window is exposed.
+
The 5 cm diameter '''GM detector''' detector window is left exposed from the lead box.
  
A 20 cm long 5 cm internal diameter Aluminum tube wrapped in lead feeds into the GM detector window.
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A 20 cm long 5 cm internal diameter Aluminum tube wrapped in lead feeds into the '''GM detector''' window.
  
A 20 cm length of the tube is filled with paraffin or polyethylene. This is the '''neutron moderator'''.
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The 20 cm length of the tube is filled with paraffin or polyethylene. This is the '''neutron moderator'''.
  
 
One end surface  of the '''neutron moderator''' is coated with silver. Vaporization of a silver wire may be used to coat the surface. Silver leafing foil may also be used.
 
One end surface  of the '''neutron moderator''' is coated with silver. Vaporization of a silver wire may be used to coat the surface. Silver leafing foil may also be used.
  
The silver end is place against the GM detector window.
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The silver end is placed against the GM detector window.
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Natural Silver consists of two isotopes, <sup>107</sup>Ag and <sup>109</sup>Ag, with 51.839% being <sup>107</sup>Ag.
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<sup>109</sup>Ag (~89 barns) neutron activation product is <sup>110</sup>Ag, half life 24 seconds.
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<sup>107</sup>Ag (~39 Barns) neutron activation product is <sup>108</sup>Ag, half life 2.5 minutes.

Revision as of 05:20, 17 July 2011


A Geiger–Müller pancake detector enclosed in lead box. This is the GM detector. Typically has a 5 CM diameter window.

The 5 cm diameter GM detector detector window is left exposed from the lead box.

A 20 cm long 5 cm internal diameter Aluminum tube wrapped in lead feeds into the GM detector window.

The 20 cm length of the tube is filled with paraffin or polyethylene. This is the neutron moderator.

One end surface of the neutron moderator is coated with silver. Vaporization of a silver wire may be used to coat the surface. Silver leafing foil may also be used.

The silver end is placed against the GM detector window.

Natural Silver consists of two isotopes, 107Ag and 109Ag, with 51.839% being 107Ag.

109Ag (~89 barns) neutron activation product is 110Ag, half life 24 seconds.

107Ag (~39 Barns) neutron activation product is 108Ag, half life 2.5 minutes.