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At least 91 records · Page 5Linked to original sources
PubMed1984

The effect of ultra-violet and visible radiation on CaSO4:Dy in Teflon discs used for personnel gamma-radiation monitoring.

The influence of ultra-violet and visible radiation (UV/VIS) on the read-out obtained from the main dosimetry peak of CaSO4:Dy in Teflon discs exposed to the gamma-radiation levels measured by a personnel-monitoring service has been studied as a function of wavelength, irradiance and radiant exposure. The results have been explained by the net effect of three separate factors, namely (i) an inherent response, (ii) a phototransfer and (iii) an optical bleaching. The response obtained from unirradiated discs illuminated with fluorescent room lighting became saturated after 16 hrs at a value corresponding to 0.33 microC kg-1 whilst gamma-irradiated discs faded to 90% of their initial exposure for the same illumination period.

Calcium Sulfate↗
PubMed1986

Monitoring radiation exposure to medical personnel during percutaneous nephrolithotomy.

To ascertain radiation exposure to medical personnel during percutaneous nephrolithotomy, lithium fluoride thermoluminescent dosimeters (TLDs) were utilized for the radiographic monitoring of 7 consecutive patients. Average fluoroscopy time per procedure was 27.8 minutes of which 15.1 minutes were for nephrostomy tube insertion and 12.7 minutes were for calculi extraction. The 2 radiologists received 4.5 and 5.1 mrad per procedure, while the 2 urologists received 2.5 and 3.7 mrad. All other ancillary personnel received less than 2.1 mrad per procedure except the anesthesiologists whose mean exposure was 4.7 mrad. By taking appropriate precautions and using the proper equipment, percutaneous nephrolithotomy can be performed with a low level of radiation exposure for all involved physicians and personnel.

Adult↗
PubMed2006

Preliminary dosimetric characterisation of thermoluminescent materials for beta radiation monitoring at nuclear medicine services.

Beta emitters are widely used in nuclear medicine for diagnostic and therapeutic purposes. The critical groups exposed to a radioactive patient include the staff, other patients and members of the public accompanying the patient. The aim of this work is to characterise thermoluminescent (TL) materials for the staff monitoring of nuclear medicine services that manipulate beta radiation solutions of (153)Sm. This study was performed using CaSO(4):Dy + Teflon pellets, produced at IPEN, with different dimensions. For the dosimetric characterisation, these TL dosemeters were exposed to gamma source ((60)Co) and to beta sealed sources ((90)Sr + (90)Y, (204)Tl and (147)Pm) and to a non-sealed source ((153)Sm). Results were obtained related to reproducibility, lower detection limits, calibration curves, angle and energy dependence of response. All tested materials show usefulness for monitoring of workers exposed to beta radiation.

Beta Particles↗
PubMed1987

Monitoring radiation dose to the hands in nuclear medicine: location of dosemeters.

The relatively high radiation dose which can be received by the hands of staff in nuclear medicine departments means that in many departments it is necessary to monitor such doses. A convenient method is to use a TLD sachet in a plastic strip around a finger. This study was done to determine whether a dosemeter worn at the base of the middle finger was adequate to monitor the dose to the surface of the whole hand. Dosemeters were worn at the finger tips, finger base and palm of both hands, on two people while preparing and dispensing radio-pharmaceuticals, and two others while giving injections using syringe shields. The pattern of distribution of radiation does to the hands was similar for all workers and for both types of work. A single, convenient site (base of middle finger) may therefore be used for monitoring radiation dose to the hand.

Fingers↗