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Instruction Manual
DIAMENTOR E

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Further Information

[D151.131.0/3]

8

 

Further Information

8.1

 

Influence of Air Temperature and Humidity

As long as the DIAMENTOR E is used in the range + 10 

°

C to + 40 

°

C, the response changes

by less than 

±

 5 %.

If the DIAMENTOR E is used in environments with high humidity (for example 30 

°

C, 75 %

relative humidity), a film of moisture might cover parts of the instrument or chamber and can
cause an increase of the leakage current (see chapter 8.2).

If such a leakage current is observed, the DIAMENTOR E should be placed for about 24 hours
in dry warm air with a maximum temperature of 50 

°

C. It is advisable to carry out such a

drying procedure after 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, leakage current most probably is the
reason.

A check for leakage is carried out (preferably over night) by leaving the instrument switched on
and having the chamber connected but not irradiated. Not more that one digit per hour should
appear (see also chapter 9).

8.3

 

Influence of Field Size and Dose Rate

The smallest current is delivered to the DIAMENTOR E when the chamber is used with the
smallest field size and the lowest exposure rate.

The greatest current is delivered to the DIAMENTOR E when the chamber is irradiated with
the largest field size and the highest exposure rate. In the range from 100 cGycm²/h to 30,000
cGycm²/s, the response changes by less than 

±

 5 %.

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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