8/13/2019 4 OK RT

1/31

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2/31

2

Fundamentals of Radiographycontd

8/13/2019 4 OK RT

3/31

3

Radiation Sources X ray

8/13/2019 4 OK RT

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4

Radiation Sources X ray contd

8/13/2019 4 OK RT

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5

Radiation Sources X ray contd

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6

Radiation Sources X ray contd

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7

Radiation Sources X ray contd

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8

Radiation Sources Gamma ray

8/13/2019 4 OK RT

9/31

8/13/2019 4 OK RT

10/31

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11

Radiation Sources Gamma ray contd

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12

Characteristics of -ray sources

Isotope Half-life Photon Energy

(MeV)

Radiation

Output

(RHM/Ci)

Effective

Penetrating

Power(mm - steel)

Caesium - 33 rs 0.66 0.39 75Cobalt - 60 5.3 rs 1.17, 1.13 1.33 225

Iridium - 192 74 da s 0.13 - 0.61 12 0.55 75Thulium - 170 128 days 0.084 .0045 12 (Aluminium)

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13

Exposure Time

Exposure = Activity (Curie or GBq) x time

e.g. Curie hours , GBq.minutes

For Gamma rays

For X-rays

Exposure = Tube current x time

e.g. miliampere.minutes

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14

Exposure charts Gamma ray

8/13/2019 4 OK RT

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15

Exposure charts X ray

8/13/2019 4 OK RT

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16

Radiation Intensityinverse square law

8/13/2019 4 OK RT

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17

Geometric unsharpness - Ug

8/13/2019 4 OK RT

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18

Scattered radiation

8/13/2019 4 OK RT

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19

Filters and Screens

8/13/2019 4 OK RT

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20

8/13/2019 4 OK RT

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21

8/13/2019 4 OK RT

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22

Radiographic techniques

8/13/2019 4 OK RT

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23

Radiographic techniques contd

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24

8/13/2019 4 OK RT

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26

8/13/2019 4 OK RT

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27

8/13/2019 4 OK RT

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28

8/13/2019 4 OK RT

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29

8/13/2019 4 OK RT

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30

8/13/2019 4 OK RT

31/31

31Thank You