Accelerator Health Physics by H. Wade Patterson PDF

By H. Wade Patterson

ISBN-10: 0125471505

ISBN-13: 9780125471503

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Example text

Somewhat later Neary and Mulvey (NEA G 58) estimated the average dose deposition through the body by neutrons and protons between 40 and 1000 MeV. Estimates were made both for monoenergetic particles and for particles accompanied by their equilibrium cascade. These latter became the basis for conversion factors recommended by ICRP (ICRP 64) for neutrons and protons. Goussev (GOU N 68) has discussed simple analytical expressions that relate particle flux density to absorbed dose rate in an approximate way.

Irradiation of the body by particles incident normally produces, in general, the largest dose equivalent per unit fluence. As Fig. 8 shows, the position of the maximum dose equiv­ alent is a function of particle energy. From dose equivalent and absorbed dose-depth curves it is possible to evaluate modifying and conversion factors: it is conventional to evaluate these at the maximum dose equivalent (MADE) in the irradiated phantom. 778 X 10" 7 /Q) particles/cm 2 sec/mrem/h, (1 2) and if the absorbed dose per unit fluence is P at the maximum dose equiva­ lent, then the modifying factor MF(E) is given by MF(E)= Q/P.

Tesch (TES K 70) has reported the use of liquid scintillators in con­ junction with a photomultiplier for neutron dosimetry in the energy range 10 to 100 MeV. The effective threshold of the instrument is selected at about 5 MeV when it has a rem response within ±15% up to about 100 MeV. Pulse-shaping techniques are used to discriminate against other particles. Coleman (COL F 69) has shown that in typical radiation environments around high energy electron accelerators the response of plastic scintillators to neutrons or photons of energy greater than 20 MeV differs by only ±30% over a wide range of energy spectra.

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Accelerator Health Physics by H. Wade Patterson


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