Radiation Protection In Veterinary Medicine - Recommended Safety Procedures For Installation And Use Of Veterinary X-ray Equipment - Safety Code 28

Appendix III Shielding Guides for Storage of Radiographic Film

To reduce the radiation level to the film to 1.75 µGy (0.2 mR) for weekly workloads of:

• 500 mA-sec at 100 kVp
• 200 mA-sec at 125 kVp
• 100 mA-sec at 150 kVp

Shielding Guides for Storage of Radiographic Film

Distance from X-ray tube to stored film
	2.0m		3.0m		4.0m		5.0m
	lead mm	concrete cm	lead mm	concrete cm	lead mm	concrete cm	lead mm	concrete cm
Storage time for primary barriers
1 day	1.6	15.2	1.3	12.6	1.1	10.9	1.0	9.6
1 week	2.3	20.4	1.9	17.9	1.7	15.9	1.5	14.5
1 month	2.8	24.8	2.5	22.3	2.3	20.4	2.1	19.0
1 year	3.9	33.0	3.6	30.5	3.3	28.6	3.1	27.0
For secondary barriers
	2.0m		3.0m		4.0m		5.0m
	lead mm	concrete cm	lead mm	concrete cm	lead mm	concrete cm	lead mm	concrete cm
1 day	0.2	1.5	0.1	1.0
1 week	0.6	5.4	0.3	2.5	0.2	1.5	0.1	1.0
1 month	1.0	9.6	0.7	7.1	0.5	5.4	0.4	3.7
1 year	2.1	17.5	1.7	14.8	1.5	13.0	1.3	11.6