scholarly journals Evaluation of Maximum Dose Rate Resulting from Failure of the Linac Charge Monitoring System

2014 ◽  
Author(s):  
Mo Benmerrouche ◽  
Robert Lee
Keyword(s):  
Dose Rate ◽  
Monitoring System ◽  
Maximum Dose ◽  
Maximum Dose Rate

scholarly journals Maximum Dose Rate Is a Determinant of Hypothyroidism After131I Therapy of Graves' Disease but the Total Thyroid Absorbed Dose Is Not

2014 ◽  
Vol 99 (11) ◽  
pp. 4109-4115 ◽  
Author(s):  
Thomas Krohn ◽  
Heribert Hänscheid ◽  
Berthold Müller ◽  
Florian F. Behrendt ◽  
Alexander Heinzel ◽  
...  
Keyword(s):  
Dose Rate ◽  
Maximum Dose ◽  
Absorbed Dose ◽  
Graves Disease ◽  
Maximum Dose Rate

scholarly journals Open beam dosimetric characteristics of True Beam medical linear accelerator with flattening filter (WFF) and flattening filter free (FFF) beam

2018 ◽  
Vol 24 (2) ◽  
pp. 79-89 ◽  
Author(s):  
Karthick Raj Mani ◽  
Md Anisuzzaman Bhuiyan ◽  
Md. Shakilur Rahman ◽  
S. M. Azharur Islam
Keyword(s):  
Dose Rate ◽  
Linear Accelerator ◽  
Maximum Dose ◽  
Published Data ◽  
Depth Dose ◽  
Medical Linear Accelerator ◽  
Flattening Filter Free ◽  
Dosimetric Data ◽  
Flattening Filter ◽  
Maximum Dose Rate

Abstract True Beam medical linear accelerator is capable of delivering flattening filter free (FFF) and with flattening filter (WFF) photon beams. True Beam linear accelerator is equipped with five photon beam energies (6 FFF, 6 WFF, 10 FFF, 10 WFF and 15 WFF) as well as six electron beam energies (6 MeV, 9 MeV, 12 MeV, 15 MeV and 18 MeV). The maximum dose rate for the 6 WFF, 10 WFF and 15 WFF is 600 MU/min, whereas 6 FFF has a maximum dose rate of 1400 MU/min and 10 FFF with a maximum dose rate of 2400 MU/min. In this report we discussed the open beam dosimetric characteristics of True Beam medical linear accelerator with FFF and WFF beam. All the dosimetric data (i.e. depth dose, cross-line profiles, diagonal profiles, output factors, MLC transmission, etc.) for 6 MV, 6 FFF, 10 MV, 10 FFF and 15 MV were measured and compared with the published data of the True Beam. Multiple detectors were used in order to obtain a consistent dataset. The measured data has a good consistency with the reference golden beam data. The measured beam quality index for all the beams are in good agreement with the published data. The percentage depth dose at 10 cm depth of all the available photon beams was within the tolerance of the Varian acceptance specification. The dosimetric data shows consistent and comparable results with the published data of other True Beam linear accelerators. The dosimetric data provide us an appreciated perception and consistent among the published data and may be used for future references.

Performance effects of diazepam during and after prolonged administration

1986 ◽  
Vol 16 (3) ◽  
pp. 561-571 ◽  
Author(s):  
Lee Brosan ◽  
Donald Broadbent ◽  
David Nutt ◽  
Margaret Broadbent
Keyword(s):  
Dose Rate ◽  
Maximum Dose ◽  
Experimental Period ◽  
Prolonged Administration ◽  
Performance Effects ◽  
Low Performance ◽  
Maximum Dose Rate ◽  
Better Than

SynopsisSeven volunteers received diazepam for a 3-week period, maximum dose rate 25 mg per day, and were tested on a variety of functions before, at two points during, and at two points after the period. Their performance was compared with that of 8 controls and was inferior on a number of measures. There was no indication either of habituation or of potentiation of the effects as the period continued. Equally, the low performance persisted for some time after administration ceased, although performance was on the whole better than during the experimental period. The particular measures showing deterioration suggested that the effects are similar to those of barbiturates as opposed to those of, for example, chlorpromazine.

Radiation exposure around patients after administration of 123I-MIBG

2002 ◽  
Vol 41 (05) ◽  
pp. 221-223
Author(s):  
S. Ofluoglu ◽  
J. Preitfellner ◽  
B. J. Fueger ◽  
T. Traub ◽  
C. Novotny ◽  
...  
Keyword(s):  
Radiation Exposure ◽  
Dose Rate ◽  
Half Life ◽  
Maximum Dose ◽  
Radiation Detectors ◽  
Mibg Scintigraphy ◽  
Dose Limit ◽  
Annual Dose ◽  
Dose Rates ◽  
M 12

SummaryAim: Estimation of the radiation exposure to neighbouring patients, personnel and relatives deriving from patients undergoing 123I-MIBG scintigraphy. Methods: For scintigraphic studies, 16 patients with suspected pheocromocytoma were injected with 340 ± 30 MBq 123I-MIBG. Dose rates were measured at a distance of 0.5 m, 1 m, and 2 m after 10 min, 3 h, 21 h, 45 h, and 68 h using three calibrated portable radiation detectors. The measured values were background corrected. Results: Ten minutes after injection the dose rate was 10.5 µS/h at a distance of 0.5 m, 3.78 µS/h at 1 m, and 0.95 µS/h at 2 m. The effective half-life was estimated to 8.68 ± 0.15 h. The maximum dose in a distance of 1 m for neighbouring patients was 46 µS/h, for personnel in a ward 27 µS/h, and to relatives in a distance of 2 m 12 µS/h. Conclusion: This study demonstrates that the calculated exposure to people around patients after 123I-MIBG injection is well below the maximum permissible annual dose limit of 1 mSv for not professionally exposed persons.

Sign in / Sign up

Export Citation Format

Share Document