Dose equivalent measurements in an area of reduced shielding at the Texas A and M Variable Energy Cyclotron

Journal Article · Sun Jul 01 04:00:00 EDT 1984 · Radiation Protection Management; (United States)

OSTI ID:5198476

Schlapper, G A; Kay, D C; Neff, R D ^[1]; Sandel, P S ^[2]

---

1. Radiological Health Engineering Program, Nuclear Engineering Dept., Texas A and M Univ., College Station, TX (US)
2. Radiological Safety Office, Texas A and M Univ., College Station, TX (US)

This paper reports on an investigation that was conducted to quantify neutron and gamma dose equivalent rates in an area of reduced shielding at the Texas A and M University Variable Energy Cyclotron, and to determine what precautions, if any, were necessary to protect construction workers in the area. Attempted measurement of the neutron component revealed that the magnetic fields generated by the cyclotron had a significant detrimental effect on the photomultiplier tube in a LiI(Eu) scintillation detector system, even when the tube was magnetically shielded. Consequently, a BF{sub 3} detector system was used to measure neutron dose equivalent rates. Measurements revealed that intermediate energy, light ion beams (protons, deuterons, and alphas) produced higher than acceptable dose equivalent rates. Measurements revealed that intermediate energy, light ion beams (protons, deuterons, and alphas) produced higher than acceptable dose equivalent rates behind a 76-cm thick concrete shield. Half-value thicknesses for the concrete shield were estimated from the measurement data and found to range from 7.5 cm to 14.7 cm, depending upon beam parameters.

• OSTI ID: 5198476
• Journal Information: Radiation Protection Management; (United States), Journal Name: Radiation Protection Management; (United States) Vol. 1:4; ISSN 0740-0640; ISSN RPMAE
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420202 -- Engineering-- Protective Structures & Equipment
43 PARTICLE ACCELERATORS
430303 -- Particle Accelerators-- Experimental Facilities & Equipment
560101* -- Biomedical Sciences
Applied Studies-- Radiation Effects-- Dosimetry & Monitoring-- (1992-)
61 RADIATION PROTECTION AND DOSIMETRY
ACCELERATORS
ALKALI METAL COMPOUNDS
ALPHA PARTICLES
BARYONS
BEAMS
CHARGED PARTICLES
CYCLIC ACCELERATORS
CYCLOTRONS
DEUTERONS
DOSE RATES
DOSIMETRY
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
GAMMA RADIATION
HADRONS
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
ION BEAMS
IONIZING RADIATIONS
ISOCHRONOUS CYCLOTRONS
LITHIUM COMPOUNDS
LITHIUM HALIDES
LITHIUM IODIDES
MAGNETIC INSULATION
MEASURING INSTRUMENTS
NEUTRONS
NUCLEONS
PERSONNEL DOSIMETRY
PHOSPHORS
PROTONS
RADIATION DETECTORS
RADIATION PROTECTION
RADIATIONS
SCINTILLATION COUNTERS
SHIELDING
SURVEYS
TEXAS A AND M CYCLOTRON