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APPENDIX V – Reference Dose Rates How to treat radioactive samples (ISIS duty officer x6789). >10μSv/hour Store sample in the lead castle for it to decay. >0.1μSv/hour Store sample in IRIS active sample cupboard with sample record sheet. The sample may NOT be removed from its container. For removal from ISIS contact the duty officer. <0.1μSv/hour The sample is not radioactive. For removal from ISIS contact the duty officer As a guide in the planning of your experiment, given below are typical dose rates
for an empty annular can:
IRIS
- Irradiation time 19.5 hrs
- Total beam current 2400uA
- Flux on sample 1x107 n/cm2.s
Time from removal
Dose rate on contact
from IRIS sample pit
(uSv/hr)
(hrs)
Cap On
Cap Off
0
150
250
1
70
150
3
40
90
9
5
20
Dose rate at 10cm from sample
(uSv/hr)
Cap On
Cap Off
8
20
3
9
2
4.5
0.5
1
For comparison:
OSIRIS
- Irradiation time 14.5 hrs
- Total beam current 1800uA
- Flux on sample 2x107 n/cm2.s
Time from removal
Dose rate on contact
from IRIS sample pit
(uSv/hr)
(hrs)
Cap On
Cap Off
0
280
600
1
170
500
35
Dose rate at 10cm from sample
(uSv/hr)
Cap On
Cap Off
35
65
12
22