RUPAC2012 - List of Authors (Dovbnya, A.N.)

Paper

Title

Page

A Possibility of High-Energy Bremsstrahlung Dosimetry by Indium Activation

155

V.L. Uvarov, A.N. Dovbnya, V.V. Mytrochenko, V.I. Nikiforov, S.A. Perezhogin, Yu.V. Rogov, V.A. Shevchenko, I.N. Shlyakhov, B.I. Shramenko, A.Eh. Tenishev, A.V. Torgovkin
NSC/KIPT, Kharkov, Ukraine

Development of a number of promising photonuclear technologies is connected with the use of bremsstrahlung sources having end-point energy up to 100 MeV and average radiation power of tens kW. Commonly, such sources are created on the basis of high-current electron linacs. A possibility of bremsstrahlung dosimetry by means of activation of a target from indium of natural composition and absorbed dose determination through the specific activity of the 115mIn isomer is reported. Preliminary study of isomer photoactivation as well as the yield of reference reactions from simultaneously irradiated natural molybdenum was conducted by simulation technique. Joint measurement of the 115mIn, 90Mo, 99Mo activity and absorbed dose in the PMMA standard dosimeters were carried out at LU-10 and LU-40 linacs of NSC KIPT in the electron energy range 8…70 MeV. It was found that, within the range of study, the ratio of the 115mIn specific activity to absorbed dose in the PMMA slightly depends on the bremsstrahlung end-point energy.

Slides THBOR03 [0.553 MB]

WEPPC058

Irradiation of an Internal Cylindrical Surface Using

V. Zakutin, A.N. Dovbnya, N.G. Reshetnyak
NSC/KIPT, Kharkov, Ukraine

Experiments on the propagation of an annular electron beam from the accelerator in the decreased magnetic field of a solenoid were carried out. The operating conditions were the following: electron energy of ~80 keV, pulse duration of 15 mks, beam current of ~60 A. The current of a beam hitting upon the internal cylindrical surface was measured by means of electrodes in the form of pipe sections having an internal diameter of 63 mm and a total length of 150 mm. It has been established that roughly 70% of the beam are "deposited" at the internal pipe surface of 30 mm long when the gradient of magnetic field decrease equals to ~100 Oe. The irradiation region along the system axis was changed by controlling the amplitude and the distribution of magnetic field decrease. The calculation of the beam energy spectrum (by the current oscillograms along the system axis and cathode voltage) has shown that about 75% of beam electrons take place in the range ± 8% of the minimum energy.

Paper	Title	Page
THBOR03	A Possibility of High-Energy Bremsstrahlung Dosimetry by Indium Activation	155
	V.L. Uvarov, A.N. Dovbnya, V.V. Mytrochenko, V.I. Nikiforov, S.A. Perezhogin, Yu.V. Rogov, V.A. Shevchenko, I.N. Shlyakhov, B.I. Shramenko, A.Eh. Tenishev, A.V. Torgovkin NSC/KIPT, Kharkov, Ukraine
	Development of a number of promising photonuclear technologies is connected with the use of bremsstrahlung sources having end-point energy up to 100 MeV and average radiation power of tens kW. Commonly, such sources are created on the basis of high-current electron linacs. A possibility of bremsstrahlung dosimetry by means of activation of a target from indium of natural composition and absorbed dose determination through the specific activity of the 115mIn isomer is reported. Preliminary study of isomer photoactivation as well as the yield of reference reactions from simultaneously irradiated natural molybdenum was conducted by simulation technique. Joint measurement of the 115mIn, 90Mo, 99Mo activity and absorbed dose in the PMMA standard dosimeters were carried out at LU-10 and LU-40 linacs of NSC KIPT in the electron energy range 8…70 MeV. It was found that, within the range of study, the ratio of the 115mIn specific activity to absorbed dose in the PMMA slightly depends on the bremsstrahlung end-point energy.
	Slides THBOR03 [0.553 MB]

WEPPC058	Irradiation of an Internal Cylindrical Surface Using
	V. Zakutin, A.N. Dovbnya, N.G. Reshetnyak NSC/KIPT, Kharkov, Ukraine
	Experiments on the propagation of an annular electron beam from the accelerator in the decreased magnetic field of a solenoid were carried out. The operating conditions were the following: electron energy of ~80 keV, pulse duration of 15 mks, beam current of ~60 A. The current of a beam hitting upon the internal cylindrical surface was measured by means of electrodes in the form of pipe sections having an internal diameter of 63 mm and a total length of 150 mm. It has been established that roughly 70% of the beam are "deposited" at the internal pipe surface of 30 mm long when the gradient of magnetic field decrease equals to ~100 Oe. The irradiation region along the system axis was changed by controlling the amplitude and the distribution of magnetic field decrease. The calculation of the beam energy spectrum (by the current oscillograms along the system axis and cathode voltage) has shown that about 75% of beam electrons take place in the range ± 8% of the minimum energy.