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Instruction Manual
DIAMENTOR E

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Introduction

[D151.131.0/3]

1

 

Introduction

It is a well recognized  goal to keep the patient's load during diagnostic X-ray examinations as
low as possible. Besides the possibilities to adjust the voltage, the current and the filtration (i.e.
the doserate), adjustable quantities during the examinations are the beam area and the
irradiation time. The task of the diagnostic dosemeter DIAMENTOR E is to measure the
product of dose rate, exposure time and area in cGycm². This product is a measure for the
patient's load.

The German regulation ("Röntgenverordnung") suggests to measure and to record the dose area
product. The DIAMENTOR E simplifies these recordings considerably.

The instrument consists of ionization chamber, electrometer with built-in display, connection
cable and separate power supply.

The area of the ionization chamber must always be bigger than the cross section of the beam.
The ionization chamber automatically determines the product of the different field sizes and the
dose, i.e. the dose area product. The patient's load is recorded during fluoroscopy as well as
during radiography. Nonstop alternating operation between fluoroscopy and radiography is
possible.

The device is calibrated in such a way that one step of the counter is equivalent to 1 cGycm².

The DIAMENTOR E complies with the rules laid down in the German regulation DIN 6819.

The working principle of the DIAMENTOR E is based on the fact that X-rays inside the
special DIAMENTOR ionization chamber produce a well defined amount of charge during the
time of exposure. This amount of charge is proportional to the product of dose and beam area
and is shown on a LC display with 4 1/2 digits.

Содержание DIAMENTOR E

Страница 1: ...reiburg Loerracher Stra e 7 D 79115 Freiburg FAX E Mail 49 761 490550 49 761 49055 70 PTW PTW DE Registergericht Freiburg HRB NR 1673 Gesch ftsf hrer Dr Edmund Sch le Dr Christian Pychlau Instruction...

Страница 2: ...id at printing date All rights are reserved for devices circuits techniques and names appearing in the manual No part of the technical documentation may be reproduced without written permission from P...

Страница 3: ...ents Safety Instruction to avoid electrical hazard The product is a device of IEC 601 protection class II Before connecting the device to the power line make sure that line voltage and frequency are e...

Страница 4: ...Connection and Care of the Ionization Chamber 9 6 Adjusting the DIAMENTOR E 10 6 1 Adjustment during the Installation 10 6 2 Checking the Calibration after Installation 10 7 Checking the Stability 12...

Страница 5: ...ctrometer with built in display connection cable and separate power supply The area of the ionization chamber must always be bigger than the cross section of the beam The ionization chamber automatica...

Страница 6: ...ecommended that the PTW power supply T99021 or T99008 is used For a mains voltage of 230 V AC it is recommended that the PTW power supply T99009 or T99008 is used If the power outlet is different from...

Страница 7: ...is pressed a charged capacitor is connected to the amplifier in put This results in a well defined number of counts The status of the counter after this proce dure allows to estimate the response of t...

Страница 8: ...er into the guides found a most light beam diaphragms Both types of chambers are 70 transparent to visible light and do not impair the use of the light beam diaphragm The ionization chambers present a...

Страница 9: ...dings The metal parts of plug and socket are connected to the outer shielding which has mass potential When installing the cable it must be sure that plug and socket of the cable do not touch metallic...

Страница 10: ...ed Repeat this procedure until the correct value of nc is displayed The RESET button must be pressed before each test 6 2 Checking the Calibration after Installation During the factory calibration the...

Страница 11: ...be placed in the reference plane e A comparison of the dose area product as indicated by the DIAMENTOR E with that calculated from the reference dosemeter dose times area should then be made at a ran...

Страница 12: ...ely 1 second and then release it By doing so an amount of charge is fed into the amplifier This amount of charge is constant within 1 If the sensitivity of the DIAMENTOR E has not changed the check re...

Страница 13: ...r each transport over longer distances 8 2 Checking the Leakage The reading of the DIAMENTOR E may be affected by leakage current If a not irradiated ionization chamber causes a reading on the display...

Страница 14: ...the delivered screws into the wall and make sure that they have a perpendicular distance of 140 mm Please make sure that the maximum distance between the wall and the head of the screw is 6 mm Now yo...

Страница 15: ...to chapter 7 every second year If leakage occurs that can not be fixed by the drying procedure described in chapter 8 1 a check of the DIAMENTOR E chamber cable and chamber should be performed First...

Страница 16: ...me 1 s Overall uncertainly of the measuring system according to DIN 6819 25 Accuracy of the display 3 1 digit Mains 115 V 230 V AC 10 15 50 60 Hz 3 Hz with separate power supply Power supply 15V DC 30...

Страница 17: ...Instruction Manual DIAMENTOR E 17 Technical Data D151 131 0 3 Chamber PTW type B type no 57523 Filtration of the chamber equivalent to 0 2 mm Al Transparency of the chamber 70 n...

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