M). The cultures were incubated at 37° for 40 mm (“Pretreatment―), whereupon the bacteria were washed and resuspended in fresh Medium HA. Portions from each culture were distributed into flasks containing premeasured amounts of the various drugs (“Additions―). After receiving cytidine-3H (2 @ig/ml; 0.13 i@Ci/ml),the cultures were incubated with aeration at 37°for 20 mm and quadr.uplic...

This report examines how to sample airborne radioactivity with minimal complexity and time expenditure, using conventional high-volume samplers in combination with alpha-particle spectrometry. The use of alpha spectrometry provides compensation for radon/thoron decay products collected on the filter paper of the sampler, leading to a seven-fold improvement in measurement sensitivity of artifici...

Positron emission tomography (PET) is a new tracer technique by which short-lived radionuclides, such as 11C are used for labeling drugs, amino acids and other compounds. The concentration in the various organs is determined non-invasively after I.V. injection. Positrons, emitted by 11C attract an electron, and the two masses are annihilated by emitting photons. These can be registered by exter...

The methods for absolute (direct) standardization, coincidence method for radionuclides emitting several simultaneous radiations and liquid scintillation counting for radionuclides emitting a single radiation, the obtained results, as the technical basis for a primary radioactivity standard recognition, are shortly reviewed. They were published in many scientific papers. The key and supplementa...

background: the natural radioactivity level and the radon concentration of soil were measured at four important geothermal area located in dikili geothermal region, turkey. materials and methods: the natural radionuclide content of soil samples were measured by nai(tl) gamma spectrometer system and the soil radon concentration were determined using kodak-pethe lr-115 type ii solid state nuclear...

Radiation Protection in Radiology, Nuclear Medicine and Radio Oncology is of the utmost importance. Radioiodine therapy is a frequently used and effective method for the treatment of thyroid disease. Prior to each therapy the radioactivity of the [131I]-capsule must be determined to prevent misadministration. This leads to a significant radiation exposure to the staff. We describe an alternativ...