AVANTTEC TLD User Instruction Manual - Page 6

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Avanttec Laboratories (P) Ltd

5) WHERE TO WEAR

a. One TLD badge should be worn compulsorily at the chest level. If a lead rubber apron is used, (e.g. in diagnostic

X- ray departments) TLD badge should be worn under the lead apron at the chest level and same should be

mentioned in the TLD/5 form.

b. The dose recorded by the TLD badge worn at the chest level represents the whole body dose equivalent.

c. In special cases, depending upon the nature of radiation work, if the doses to the hands and forearms are

expected to be significantly higher than at the chest level, additional wrist badges may be procured and used.

Examples of such categories are persons handling radioisotopes from close distances and radiologists /doctors

doing the special investigations such as cardiac catheterization, angiography's etc.

d. Persons who are working with industrial radiography cameras should compulsorily use wrist badges in addition

to chest badge.

6) HOW TO USE

a. The TLD cards shall not be used without being loaded in the holders. Once the card is loaded in the cassette it

should not be removed till the end of the service period. It is not possible to determine the nature and energy of

the incident radiation from a TL card used without a cassette and hence dose estimation will not be possible.

b. Whenever working in the radiation field, TLD badge should be always worn by the person.

c. A TLD badge allotted to one user should not be shared by any other person.

d. Each institution should keep apart one TLD card loaded in a chest TLD holder as CONTROL which is required for

correct dose evaluation. The control badge should be stored in a radiation free area where there is no likelihood of

any radiation exposure.

Places such as X-ray rooms, rooms in which radioactive materials are stored, handled or used and areas in the

immediate vicinity of such rooms are NOT RADIATION FREE AREAS and should be avoided for storing the TLD

cards. Kindly note that the TLD card and cassette for control TLD badge will also be charged.

e. While leaving the premises of the institution, workers should submit their badges in the place where the control

badge is kept. Also when no radiation work is being carried out, badge should be kept along with the control TLD

badge.

f. A TLD cassette holder showing any of its filters (metallic pieces) loose or falling off or otherwise damaged should

not be used. Ask for replacement of such holders. The cassette for replacement will also be charged.

g. ENSURE THAT YOUR BADGE IS NOT LEFT IN THE RADIATION FIELD OR NEAR HOT PLATES, OVENS, FURNACES, and

BURNERS etc.

h. Institutions using open/unsealed radioactive sources should periodically check the TLD cassette for radioactive

contamination by using suitable instruments. The cassettes which are found to be contaminated should be

disposed of at your end as radioactive waste. The contaminated badges should not be returned to us.

i. Personal numbers are allotted to the radiation workers by Calibration & Dose Record Section, Radiological

Physics & Advisory Div, BARC, Mumbai. They are permanent and should not be changed at your end.

7) HOW TO RETURN THE USED TLD CARDS

a. Return all the cards, (not the cassette), used and /or unused, immediately after every service period in one lot

along with the TLD/5 form within 5 days after the end of the service period provided the cards to be used for next

TLD CARD USERS INSTRUCTION MANUAL Rev.E-5.01 – 11.07.19