| 摘要 |
The present invention provides a method for monitoring temporal variation in irradiating radiation received by a material, comprising the steps of: providing a flow of an actinometric fluid ( 4 ) through a monitoring portion ( 22 ) of a passage ( 10 ), such that said actinometric fluid therein intercepts a flux of said irradiating radiation ( 13 ) representative of the flux of the radiation received by the material; and analysing said actinometric fluid ( 4 ) downstream of said monitoring portion ( 22 ) so as to measure a change in said actinometric fluid due to irradiation by said intercepted radiation flux. The invention also provides an apparatus for use in the above method.
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