Radiography [Compatibility Mode]

8/10/2019 Radiography [Compatibility Mode]

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Radiation Symbol


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STORAGE OF RADIO ACTIVE CAMERA & SOURCE

Layout Plan for Radiography Camera Store Room


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The following information to logged:

Date & time of taking the source with cameraType & 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


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Permissible Leakage Level of Camera

Measurement DistanceAverage

mR/hr

Maximum

mR/hr5 cm from Surface 20 100

1m from source position 2 10


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Safe Work Practices

Carry out Radiography operations during

No occupancy timesFar away from workplace

Night hours

Less occupancy timesHolidays

Lunch Hours

Make wire fence / brick enclosure for

regular radiography area.


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Transportation of sources

Check source pencil is securely immobilized andlocked 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 radiographicequipment without consulting the Radiological

Safety

Officer (RSO)


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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 atcordoned boundaries

Ensure adequate illumination

Safe Work Practices


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SourceStrength

Nature ofHuman

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 47Occasional 10 13 17 18 24

8 Curie Full 47 65 80 94 122

Partial 24 33 40 48 56Occasional 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)


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Nature of Human Occupancy Occupancy Factor

Full 1

Partial 1/4

Occasional 1/16

Occupancy Factor for open field radiography


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EnsureFollowing 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..


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EnsureOperators undergoes regular medical check up as perBARC

Source is not handled by handWhen 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 providedbetween radiographic equipment and thecontrol unit / panel

Operator aware about his dose records and

reports of periodic medical exams

Safe Work PracticesContinued..


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Safe Work PracticesMake 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 thesource returns to safe position


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Organ

Dose Limit for adultradiography

workmen

(rems/Year)

Dose Limitfor Public

(rems/Year)

Bone morrow, Eye Lens 5 0.5

Skin, Bones & Thyroid 30 3

Hands, Forearms, Feetand 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 notexceed 100 milli Rems per week, 1 Rems per calendar quarter and 5Rems 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 turnreddish and a little higher dose will make the hair fall.

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Radiography [Compatibility Mode]