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By J. Craig Robertson (auth.)

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Extra info for A Guide to Radiation Protection

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Certificates of registration are issued to each user showing the sealed sources, total quantity of open source material and amount of waste which can be held and disposed of respectively. The manner in which the waste must be disposed of is also stated. These certificates should be on display and place certain obligations on the user regarding the storage and handling of active materials. For example, when not in use the sources must be kept in a fireproof store. The general rules for handling radioactive materials as outlined in this book must be adhered to.

To obey the first two rules requires no special knowledge. Tongs or tweezers are used as necessary to keep the radioactive material as far from the hands and body as possible. 2 which shows open source material being dispensed. In addition, the principle of containment is being applied. The operation is carried out over a large tray lined with absorbent paper so that if a spill occurs, the spillage will be confined to the area of the tray. It is to assist with this containment that open sources are usually handled in special laboratories as discussed in chapter 2.

In the geiger counter only about two per cent or less of all the gamma-rays entering the counter are absorbed and produce pulses. In the scintillation counter, the efficiency can be as high as 70 per cent for gamma-rays. In addition, the amount of light produced in the scintillating material is dependent on the energy of the radiation. Hence we can use the scintillation counter to identify nuclides by the energy of their radiation. For gamma-rays this is called gamma-ray spectrometry and is the usual method employed in identifying an unknown radioactive nuclide.

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