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At least 109 records · Page 6Linked to original sources
PubMed1983

Recent muon fluence measurements at Fermilab.

Muon fields at Fermilab were measured during 1980-81 using a Mobile Environmental Radiation Laboratory (MERL). During the spring of 1980, measurements were made with the accelerator operating at 350 GeV; in the spring of 1981, measurements were made at 400 GeV. The measurements were used to obtain an understanding of muon dose-equivalent rates at various locations both on and off the Fermilab site. These were found to be less than 1 mrem/yr at any given location. The data indicate that more severe problems may be encountered during operations of the 1000 GeV accelerator presently being installed.

Elementary Particles↗
PubMedDate not supplied

Bremsstrahlung review: an analysis of the Schiff spectrum.

A concise approximate formula computed by Schiff for the intensity spectrum of bremsstrahlung photons has been a valuable starting point for many medical physics applications, including the Task Group 21 protocols. This paper provides a brief review of the literature related to determination of the bremsstrahlung spectrum and to the Schiff formula in particular. It describes the approximations Schiff made to obtain this formula, including the Born approximation, and the exponential nuclear screening potential, the infinite-mass nucleus approximation, and the "extreme relativistic" approximation. A derivation of a more exact formula that avoids the last of these approximations is presented. This provides a check on the accuracy of the Schiff spectrum for linear accelerator energies used clinically. Comparisons with the Schiff thin-target result are presented. A thick-target bremsstrahlung spectrum is calculated and compared with the forward spectrum obtained from Monte Carlo simulations of the x-ray production in two linear accelerator treatment heads.

Particle Accelerators↗
PubMed1980

A simple electron cone interlock system for the clinac-18.

A simple electron cone-collimator interlock system has been developed for the Clinac-18. Each cone is assigned a special slot in the storage cabinet and, upon being taken for treatment setup, sends out a binary coded decimal (BCD) signal to the control console. The voltage from the collimator setting must match the BCD signal or a comparator logic will drive the fault matrix to prevent the accelerator from energizing.

Electrons↗
PubMed1983

[Tissue activation by bremsstrahlung from medical accelerators].

If a continuous radiation with a maximum energy of more than 10.55 MeV is used in radiotherapy, there is an activation of tissue. A radiation exposure of the staff may be connected with this activity induced by the nuclear photon effect. The consequences for routine radiotherapy are demonstrated by the examples of a betatron 42 MeV and a linear accelerator Clinac 20.

Humans↗