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The Effect of Pumice Rate on the Gamma Absorption Parameters of Concrete

100%

Akkurt I., Akyildirim H., Mavı B., Kilinçarslan Ş., Başyığıt C.

Acta Physica Polonica A

2012

vol. 121

issue 1

144-146

Since the technology concerning gamma radiation showed a rapid development, it became a necessity to be protected from it. One of the common shielding materials for this purpose is concrete. This study aims to give the effect of pumice rate on the gamma radiation attenuation coefficients of normal concrete (ρ = 2.476 g cm^{-3}) containing different rates of pumice mineral. Pumice, for which the Gölcük region in Isparta province is rich, is a volcanic originated spongy and porous mineral. Although it is a light material, it has a high comprehensive strength and heat resistance. So it became a common construction material in buildings. In the study, the variation of attenuation coefficients for concretes of different pumice rates were measured for 662, 1173 and 1332 keV photons using a NaI(Tl) detector. The experimental values were compared with the theoretical ones obtained by XCOM code.

Photon's Structure of Motion

80%

Delić N., Tošić B., Šetrajčić J., Markoski B., Pelemiš S., Sajfert V., Zorić V.

Acta Physica Polonica A

2009

vol. 116

issue 4

471-475

A free photon Hamiltonian is linearized using Pauli's matrices. Based on the correspondence of Pauli's matrices kinematics and the kinematics of spin operators, it has been proved that a free photon integral of motion is a sum of orbital momentum and spin momentum for a half-one spin. Linearized Hamiltonian represents a bilinear form of products of spin and momentum operators. Unitary transformation of this form results in an equivalent Hamiltonian, which has been analyzed by the method of Green's functions. The evaluated Green function has given possibility for interpretation of photon reflection as a transformation of photon to antiphoton with energy change equal to double energy of photon and for spin change equal to Dirac's constant. Since photon is relativistic quantum object the exact determining of its characteristics is impossible. It is the reason for series of experimental works in which photon orbital momentum, which is not integral of motion, was investigated. The exposed theory was compared to the mentioned experiments and in some elements the satisfactory agreement was found.

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2 Acta Physica Polonica A

1 2012

1 2009

1 Akkurt I.

1 Akyildirim H.

1 Başyığıt C.

1 Delić N.

1 Kilinçarslan Ş.

1 Markoski B.

1 Mavı B.

1 Pelemiš S.

1 Sajfert V.

1 Tošić B.

1 Zorić V.

1 Šetrajčić J.

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The Effect of Pumice Rate on the Gamma Absorption Parameters of Concrete

Photon's Structure of Motion