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Atomic and nuclear physics - Frederiksen

Atomic and nuclear physics - Frederiksen

130Atomic and nuclear physicsBench for experiments with radioactivityThis bench for radioactive sources and GMtubes provides a stable and convenientsetup, allowing reproducible results whenmaking experiments with radioactivity.Typical quantitative experiments comprises:absorption of gamma radiation in lead oraluminium, absorption of betaradiation in aluminium, variation of intensitywith distance etc.The equipment consists of a 40 cm longbench with a tape measure, a saddle formounting the GM tube and a mount forradioactive sources. Also provided is a set ofabsorber plates comprising: 5 ea. 2mm and10 ea. 1 mm lead plates, 2 ea. 3 mm, 6 ea.2 mm and 4 ea. 0.5 mm aluminium plates.The absorbers can be placed hanging froma Ø 6 mm steel rod, protruding from the source mount.The absorber plates are supplied in a convenient storage box.The lead plates have been enamelled to protect fingers fromlead contamination.5141.00 Bench for experiments with radioactivity5141.00Coincidence experimentsHolder for radioactive sourceThis holder can be placed in a 2946.50 joint link to ensure fixeddistances to two detectors in a rotational symmetric arrangement.Useful for studying angular correlation in nuclear decaysor positron annihilation.5141.95 Holder for radioactive source2946.105135.705141.95Mounting hardware5141.10 Mounting Bench Rail2946.10 Sliding Saddle2946.50 Joint Link5141.022946.50Good News: A wider range of sources can now be used with our equipmentAlthough A/S Frederiksen only provides the radioactive sources shown in this catalogue, other popular types can now be usedwith our equipment. The two new types are the 12 mm cylindrical sources (as provided by for instance Phywe and Leybold) - andthe 25 mm disk sources (as provided by for instance Pasco and Spectrum Techniques).Please refer to the table below for the relevant item numbersSelection GuideType 1 (Frederiksen) Type 2 (disk) Type 3 (cylindrical)Source holder on rod including abs. plates 5140.05 5140.25 5140.35Source holder on rod without abs. plates 5140.07 5140.27 5140.37Bench for experiments with radioactivity 5141.00 5141.20 5141.10Deflection of beta particles 5141.05 5141.25 5141.35Beta spectrum apparatus 5165.00 5165.20 5165.30Holder for radioactive source 5141.95 n.a. 5141.97Source holder for exp. bench, simple 5141.80 5141.85 5141.87®science

Atomic and nuclear physics131Beta spectrometer apparatusElectric particles with a given velocity follow a circulartrajectory in a uniform magnetic field. If the radius is fixed, thevelocity can be deduced from the strength of the magneticfield.The apparatus consists of a threaded holder for the betasource and a Plexiglas block with a narrow, quarter circulargroove for the beta particles. The block has a notch for a Halleffect probe. A strong electromagnet (e.g. 4593.00, 4595.00plus 2 ea. 4590.40) and a teslameter (4060.50) are needed5165.00 Beta spectrometer apparatus5165.00Deflection of beta particlesThe deflection of beta particles is easily demonstrated withthis accessory for the bench for experiments with radioactivity(5141.00). The magnetic field is provided by a pair of strongpermanent magnets. The direction of the field can be reversedand the magnets can be removed altogether.A beta source is mounted in a collimator that can turn aroundthe centre of the magnets, thereby changing the anglebetween the incoming particle beam and a Geiger-Müllerdetector.To demonstrate the effect of the magnetic field on the betaradiation, you start with the magnets removed from theapparatus and align the beta source and the detector. Whenthe magnets are re-introduced, the radiation “disappears”.By changing the angle between source and deflector, theradiation can be found again – but only if the magnetic field isoriented correctly.From the angle of deflection the kinetic energy of theparticles can be deduced. This way the energy spectrum can besketched to show its continuous nature.5141.05 Deflection of beta particles5141.00TeslameterThis instrument is ideal for determining the strength of themagnetic field when doing experiments with 5165.00 Betaspectrum apparatus or5141.05 Deflection ofbeta particles. For adetailed description,see page 118.4060.50Teslameter5141.054060.50science®

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