Radiation Symbol

Obtain legal approval to store and handle isotopes

Use occupancy less area for storage

Follow suggested design of storage, otherwise obtain competent approved alternative design

Store radiography cameras / sources in pit in a separate storage room

Keep the storage room under lock & key always

SAFE STORAGE OF SOURCE

Continue…

Check proper storage of source inside camera after every use.

Use survey meter check radiation leakage

Post Warning signs along with radiation symbol

Operator shall maintain log book to record usage of the equipment

SAFE STORAGE OF SOURCE

Continued.

STORAGE OF RADIO ACTIVE CAMERA & SOURCE

Layout Plan for Radiography Camera Store Room

The following information to logged:

Date & time of taking the source with camera

Type & strength of sources

Model & serial no. of camera

Name of the radiographer

Location of use

Type & number of exposure

Duration of use

Date & time of return of the source with camera

LOG BOOK

Permissible Leakage Level of Camera

Measurement DistanceAveragemR/hr

MaximummR/hr

5 cm from Surface 20 100

1m from source position 2 10

Safe Work Practices

Carry out Radiography operations during

No occupancy timesFar away from workplaceNight hours

Less occupancy timesHolidaysLunch Hours

Make wire fence / brick enclosure for regular radiography area.

Transportation of sources

Check source pencil is securely immobilized and locked in camera

Inform BARC (Baba Atomic Research Centre), Mumbai, if damage to the cameras during transport,

non-receipt of consignment in the reasonable time

Avoid Maintenance and servicing of radiographic equipment without consulting the Radiological

Safety Officer (RSO)

Cordoning the radiography area

Calculate the safe cordoning distance

Make barricades with warning signs

Make reflective signs during night time operation

Use survey meter to check radiation level at cordoned boundaries

Ensure adequate illumination

Safe Work Practices

Example Calculation

Iridium-192 of 20 curie is used in open field of Occasional Occupancy for a period of 5 hours per week. Calculate the cordon off distance. Take Public dose limit as 2mR/week and B as 40.

Cordon off distance in the direction of primary beam:D2 = (K x A x W) T / P

= (500 x 20 x 5) (1/16) / 2D = 39.5 m

Cordon off distance in the directions other than primary beam direction: D2 = (K x A x W)T / (P x B)

= (500 x 20 x 5) (1/16) / (2X40)D = 6.25 m

Source Strength

Nature of Human

Occupancy

Work Load

5 hrs/week

10 hrs/week

15 hrs/week

20 hrs/week

30 hrs/week

Cordon off distance (m)

5 Curie Full 37 52 66 74 93

Partial 18 26 33 36 47

Occasional 10 13 17 18 24

8 Curie Full 47 65 80 94 122

Partial 24 33 40 48 56

Occasional 12 16 20 24 28

10 Curie Full 53 74 90 100 126

Partial 26 37 45 52 63

Occasional 13 19 22 26 31

Cordon off distances for Open Field Radiography (Panoramic Exposure) (Iridium – 192)

Nature of Human Occupancy Occupancy Factor

Full 1

Partial 1/4

Occasional 1/16

Occupancy Factor for open field radiography

Ensure Following Industrial Radiography Information form

(Format attached)

Radiographer carries film badge / dosimeter

Radiographers dose limit is below the permissible limit ( chart shown in next

slide)

Radiographers follows the safety instruction strictly

Safe Work Practices

Continue…..

Ensure Operators undergoes regular medical check up as per BARC

Source is not handled by hand

When source is expose it is advised to

Stand behind buildings / steel / shielding materials

Stay away from source of radiation

Limit exposure for particular operator /day

Make use of full length cable provided between radiographic equipment and the control unit / panel

Operator aware about his dose records and reports of periodic medical exams

Safe Work Practices Continued..

Safe Work Practices

Make collimated exposure

Avoid panoramic exposure

Use full length camera

Use suitable supporting and fastening devises

Camera operation behind barriers

Plan well the activities to limit exposure time.

Use radiation survey meter to check the source returns to safe position

Organ

Dose Limit for adult radiography

workmen(rems/Year)

Dose Limit for Public

(rems/Year)

Bone morrow, Eye Lens 5 0.5

Skin, Bones & Thyroid 30 3

Hands, Forearms, Feet and Ankles

75 7.5

Other Organs 15 1.5

Maximum Permissible Dose Limit

Cumulative dose for an occupational worker can be (N-18) Rems, N is the age of the radiography workmen. On an average it shall not exceed 100 milli Rems per week, 1 ¼ Rems per calendar quarter and 5 Rems per year. 250 to 400 RADs are sufficient to make it fatal in 50% of the cases within 30 days. With 50 to 100 RADs, the skin will turn reddish and a little higher dose will make the hair fall.

LARSEN & TOUBRO LIMITED ECC DIVISION

Ref: PM-20-D Rev 00

INDUSTRIAL RADIOGRAPHY - INFORMATION FORM

(This form to be filled up by the concerned Radiography agency and submitted to the Site Safety Co-ordinator. two days before Radiography date) 1. Radiography work to be done for (Name of Contractor) M/s 2. Name of Radiography Agency M/s _______________________________________________ 3. Name of the Incharge of the Radiography agency Mr._______________________________________________ 4. Date & Time of Starting 5. Date & Time of Completion 6. Location of Radiography work and area demarcated and cordoned (Sketches and Distances to be provided) 7. Source strength ____________________ Curies 8. Area cordoned & Radiation warning signs displayed and flash lights provided ( if no, give reason) Yes _______ No _________ 9. Visual check & other Agencies working nearby informed (if no, give reasons) Yes_______ No _______ (Give Name of other Agencies informed) 10. Whether Dosimeter & Survey meter available at site(if no, give reasons) Yes_______ No _______ 11. Whether Film Badges are available with operators(if no, give reasons) Yes_______ No _______ 12. Any other special precautions taken

Signature _____________ Site Incharge of Radiographic Agency

Signature _____________ Site Incharge of Contractor

Signature _____________ Site Engineer of ECCD

Signature _____________ Site Safety Co-ordinator of ECCD

YOUR TIMETO

GET CLARIFIED

ANY Q ?