Document Type : Research Paper

Authors

• F Manuchehri
• F Torkzadeh
• N Mirzajani
• Sh Jalilian

Abstract

Thermoluminescence dosimeters are well known for their widespread applications in dosimetry specially neutron dosimetry. In low neutron fluences it is usual to use (n,α) reaction for direct measurement of neutron fluence, but in higher values, some gray filters are necessary. And also supralinearity because of the high absorbed dose makes the direct reading of TLDs difficult. After anealing of dosimeters the absorbed dose from the internal activity was used as a mass for neutron fluence. In this work thermal neutron fluence in the range between 10¹¹ and 10¹³ n/cm² in the reactor core of Tehran Research Reactor was measured using TLD-600 thermoluminescence dosimeters. The influence of irradiation-induced damage effect on the response of TLDs and their subsequent readings have been minimized. The measurements were made reproducible in this manner. The induced TL-light reader due to self-activity in TLD-600 dependens on the neutron fluence caused a conveniently measurable TL glow curve. The accumulated TL-light was measured after storage periods of 24, 48 and 72 hours. A short theoretical treatment is also presented at this work.

Highlights

1. 1.    E. Piesch, B. Burgkhardt, D. Singh, Proc. 5 th Int. Conf. On Luminescence Dosimetry. Sao Polo p.94 (1977).

 

1. 2.    S.I. Tanaka and Y. Futura, “Nucl. Nuclear Instrument and Methods,” 133, 485-499 (1976).

 

1. 3.    M.C. Kleveen, J.W. (Arizona State Univ, Tempe); M. Schwenk, “Reactor flux measurements using thermoluminescence dosimetry,

 

1. 4.    F. Torkzadeh, Neutronen dosimetrie mit LiF-Thermoluminescence dosimeter, Diplomarbeit, Atominstitut d. Österr. Uni (1994).

 

1. 5.    Y.S. Horowitz, S. Freeman, A. Dubi, “Nuclear Instrument and Methods,” 313-315 (1979).

 

1. 6.    F. Bench and K.M. Fleck, Physik und Technik der Aktivierungssonden, Atominstitut der Österr. Uni, Wien.

 

1. 7.    E. Piesch, B. Burgkhardt, A. M. Sayed, “Activation and damage effects in TLD-600 after neutron irradiation,” Nucl. Inst. and Meth. 157, 179-184 (1978).

Keywords

• Term Luminescent Dosimeters
• Thermal Neutrons
• Neutron Fluence
• Radiation Dose
• Gamma Radiation