In order to overcome the shortcomings of traditional X-ray inspection taking passive protection mode, this paper combines the automatic control technology, puts forward a kind of active protection X-ray equipment. The device of automatic detection of patients receiving X-ray irradiation part, intelligent adjustment in patients and shooting device between automatic tracking radiation protection device height. The device has the advantages of automatic adjustment, anti-radiation device, reduce the height of non-irradiated area X-ray radiation and improve the work efficiency. Testing by the professional organization, the device can decrease more than 90% of X-ray dose for patients with non-irradiated area.
Humans ; Radiation Dosage ; Radiation Protection ; instrumentation ; methods ; X-Rays

Adult ; Gamma Rays ; Humans ; Male ; Radiation Protection ; instrumentation ; Space Suits

In order to improve the diagnostic quality of X-ray device and to promote the implementation of radiation protection in accordance to the ICRU definition and ICRP classification standards for measuring radiation harm to human body, we have made a number of tests, including the kinetic energy released by ionizing air, the Half-value layer, the output dose coincidence, the High contrast resolution, the Consistency between visual light field and project X-ray field, and the Focus of X-ray tube. We have also analysed the measured data and results. The tests were conducted on the XEB150L-20 made by Shimadzu Co. in the middle of 1990s.
Quality Control ; Radiation Dosage ; Radiation Monitoring ; methods ; Radiation Protection ; methods ; Radiography ; instrumentation ; Radiometry ; methods

In this paper, the question about automatic brightness control for x-ray imaging systems based on CCD camera is discussed, and the structure and principle of an auto brightness control loop are analyzed along with the working procedure of the x-ray imaging system. A kind of digital brightness controller about a typical device and the designing idea of the computer brightness intelligent control software is introduced.
Algorithms ; Image Processing, Computer-Assisted ; Radiation Protection ; Radiographic Image Enhancement ; instrumentation ; Radiography ; instrumentation ; X-Ray Intensifying Screens

This article introduces a new testing method for mammographic x-ray equipments. The films placed around the x-ray tube assembly are exposured to find the location of leakage radiation and then the accurate testing for the leakage radiation of the mammographic x-ray equipment is carried out with a radiation dosimeter.
Equipment Design ; Equipment Failure Analysis ; Female ; Humans ; Mammography ; instrumentation ; methods ; Quality Control ; Radiation Dosage ; Radiation Protection ; instrumentation ; methods ; Radiometry ; instrumentation ; methods

No abstract available.
DNA Breaks, Double-Stranded/radiation effects ; Humans ; Radiation Injuries/*etiology ; Radiation Protection/instrumentation ; Radiation, Ionizing ; Radiotherapy Dosage ; Tomography, X-Ray Computed

OBJECTIVETo investigation the shielding property to (125)I of several different prosthetic materials used in clinical when prostheses are used as carriers of (125)I seed in tumor treatment.

METHODS(125)I seeds were taken as the radiation sources to establish a model in vitro and the radiation doses were measured by thermoluminescent dosemeters (TLD). The shielding property of titanium plate, cochrome plate, and poly methyl methacrylate (PMMA) plate were detected, calculated and compared with that of plumbum plate in the control group.

RESULTSThe radiation doses of the radiation source at 10 mm distance through the following materials were measured, and the results are 2.805 mGy (0.09 mm thick titanium plate), 1.082 mGy (0.48 thick titanium plate), 0.390 mGy (0.41 mm thick cochrome plate), and 0.261 mGy (0.67 mm's cochrome plate), and 2.885 mGy (1.685 mm thick PMMA plate).

CONCLUSIONSThe shield property of cochrome is optimal. The poly methyl methacrylate behaves to some extend as a shield to the (125)I seed which can shield the radiation as the effects of plumbum when adopted together with the 0.557 mm's (or more) titanium plate.

Brachytherapy ; Chromium ; chemistry ; Cobalt ; chemistry ; Dental Materials ; Dental Prosthesis ; Iodine Radioisotopes ; Polymethyl Methacrylate ; chemistry ; Protective Devices ; Radiation Dosage ; Radiation Protection ; instrumentation ; Thermoluminescent Dosimetry ; Titanium ; chemistry

OBJECTIVETo study the influence of electromagnetic irradiation on cytochrome P450 cholesterol side chain lyase (P450scc) in adult rat testis tissues and to assess the protective effect of the copper shield.

METHODSHealthy male Wistar rats were randomized into a control group, an electromagnetic irradiation group and a wholly shielded group (with the copper shielding net). The electromagnetic irradiation group and the shielded group were set for 4 phases of 3, 6, 24 and 72 hours after irradiation, 15 rats for each phrase. The testosterone contents in the serum of the irradiated rats at 3, 6, 24 and 72 hours and in that of the controls were measured by radioimmunoassay(RIA), and so was the level of the P450scc mRNA in the testis tissues by semi-quantitative RT-PCR. And the effect of the copper shielding net on testosterone and P450scc mRNA was observed.

RESULTSThe contents of testosterone and the P450scc mRNA level in the irradiated group were significantly lower than in the control rats, decreased by 83.9% and 56.9% at 3 hours (P < 0.01), 54.8% and 27.3% at 6 hours (P < 0.01), restored to normal at 24 hours, but again reduced by 60.1% and 56.1% respectively (P < 0.01). While in the shielded group, no significant change was observed either in the testosterone of the serum or in the P450scc mRNA expression in the testis tissues.

CONCLUSIONElectromagnetic irradiation may affect the transcription of P450scc in adult rat Leydig cells and thereby decrease the testosterone synthesis. Whole-body shielding with the copper net may achieve satisfactory effect.

Animals ; Cholesterol Side-Chain Cleavage Enzyme ; biosynthesis ; genetics ; Copper ; Male ; RNA, Messenger ; genetics ; Radiation Protection ; instrumentation ; Radioimmunoassay ; Random Allocation ; Rats ; Rats, Wistar ; Reverse Transcriptase Polymerase Chain Reaction ; Testis ; metabolism ; radiation effects ; Testosterone ; blood