Lange poses the question “are personal and static samples related?”. It is reasonable to expect that in general, personal exposure would be greater than static samples if on average workers spend a proportion of their time close to sources of the hazardous substance. The median ratio between personal and static concentrations was 1.5, although the individual data points ranged from 0.4 to 10. ![]() In this analysis more than 80% of the personal measurements exceeded the corresponding static sample concentration. This showed, as Lange asserts in his letter to this journal, 3 that personal samples are “generally higher in concentration than static samples”. 5 In this commentary, information concerning personal and static measurement results from papers published in that journal over the past 10 years was reviewed. This classic paper has recently been reproduced in the electronic edition of the Annals of Occupational Hygiene together with a commentary on its significance to the science of human exposure assessment. 4 They compared their new personal sampler with the conventional static sampler and showed that personal exposures were generally higher than those made at a fixed location. In 1957 the personal sampling pump had just been invented by Jerry Sherwood and Don Greenhalgh from the UK Atomic Energy Authority. The paper from Harrison and his co-workers 1 and the subsequent correspondence 2, 3 has reignited a debate about the relation between personal and static sample measurements that started more than 40 years ago.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |