PHYS40422: Applied Nuclear Physics Paul Campbell Room 4.11 1.Interaction of Radiation with Matter 2.Radiation Detection.

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Presentation transcript:

PHYS40422: Applied Nuclear Physics Paul Campbell Room Interaction of Radiation with Matter 2.Radiation Detection 3.Biological Effects of Radiation 4.Applications of Nuclear Techniques 5.Nuclear Fission 6.Nuclear Fusion

V R particle gas earthed wall Voltage amplifier Archetypal gas detector

A B C D E

lnq or lnV t electrons: 10 μs timescale +ve ions: 10 ms timescale RC of circuit Output signal from an ion chamber: no Frisch grid

Anode Cathode particle 1 particle 2 ~100 μs ~10μs e - drift times

q or V t t 0 from bandwidth Particle close to cathode Particle close to anode Charge collection from electrons produced by ionisation in a gas detector with no Frisch grid

q or V t particle close to anode particle close to cathode Output pulses produced by a narrow bandwidth amplifier: no Frisch grid

Anode Cathode Frisch grid Charge collection with a Frisch grid

The silicon p-n Junction Detector V Al contact Au contact n-type Si p-type Si depletion layer

A typical NaI(Tl) spectrum

NaI compared with Ge